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Article

Stranding of Mesopelagic Fishes in the Canary Islands

by
Airam N. Sarmiento-Lezcano
1,*,
María Couret
1,
Antoni Lombarte
2,
María Pilar Olivar
2,
José María Landeira
1,
Santiago Hernández-León
1 and
Víctor M. Tuset
1
1
Instituto de Oceanografía y Cambio Global, IOCAG, Palmas de Gran Canaria, Unidad Asociada ULPGC-CSIC, Campus de Taliarte, Universidad de Las, 35214 Telde, Spain
2
Institut de Ciències del MarCSIC, Passeig Marítim 37–49, 08003 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Animals 2022, 12(24), 3465; https://doi.org/10.3390/ani12243465
Submission received: 19 November 2022 / Revised: 2 December 2022 / Accepted: 6 December 2022 / Published: 8 December 2022
(This article belongs to the Special Issue Trophic Web and Predator–Prey Dynamics in Marine Environment)
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Abstract

:

Simple Summary

We investigated the causative mechanism of the first mesopelagic fish strandings along the southeast shore of Gran Canaria Island (Canary Islands) during June 2021. We examined remote sensor data (current velocity, Trade Winds, and the presence of upwelling filaments and eddies near the island) to determine the reasons for the strandings. The biological data collected was appropriate for external morphological identification and otolith analysis. In summary, the stranding of mesopelagic fishes was dominated mainly by Diaphus dumerilli, although the otolith analysis revealed the presence of other Myctophidae species. Stranding events are common and appear to be related to mesoscale oceanographic structures. A monitoring program of coastal sites in combination with satellite-derived environmental data will help to gather robust information for modeling when and where such events might occur and what species are associated with these processes.

Abstract

Most mesopelagic fishes perform large diel vertical migrations from the deep-sea zone to the surface. Although there is a trade-off between a higher food availability at the upper layers and an energy cost and predation risk, incursion towards the surface also implies a transport by currents, where the fish are exposed to a stranding risk on the coast. Here, we reported the first documented stranding of mesopelagic fishes along the southeast shore of Gran Canaria Island. Our study hypothesized that (1) the influence of the Canary Current, (2) the dominant incidence of the Trade Winds during summer, and (3) the presence of an upwelling filament coupled with an anticyclonic eddy south of Gran Canaria Island were the causative mechanisms of the strandings. Diaphus dumerilii (Myctophidae family) was the main species found as observed from an external morphological analysis using traditional taxonomy. The otolith contour analysis suggested the presence of other Diaphus spp. and Lobianchia dofleini. Nevertheless, the otolith morphological features described in the literature suggested that all the specimens were actually D. dumerelii. Errors in the identification were mainly due to the high intraspecific variability found in the otolith morphology. Even so, two patterns of oval and elliptic shapes were described with significant differences in its morphometry.

1. Introduction

The mesopelagic, or twilight zone (water masses between 200 and 1000 m depth, Robinson et al. [1]), is considered as the oceanic region with the highest micronekton biomass, holding ~1000 million tons of mesopelagic fishes [2,3,4,5,6]. These are highly diverse and abundant and conform to an important community of deep-sea ecosystems as well as, at the intermediate trophic levels, top predators, a critical component of food webs [7,8]. Mesopelagic fishes comprise 30 families [9]. Myctophidae (lanternfishes) are one of the most diverse deep-sea groups (36 genera and 260 species, [10,11]). Moreover, this group is one of the most abundant marine vertebrates collected globally in mesopelagic waters [12]. Most mesopelagic fishes perform large diel vertical migrations (DVMs, [13]) from the deep-sea zone, where they remain during the day, to the shallower layers where they feed at night [14,15,16]. Thereby, they transport the ingested carbon in the upper productive layers to the deep waters [17,18,19], which is in turn of significance to the biogeochemistry of the ocean [3,20,21,22]
Stranded mesopelagic fishes have been recorded in Mediterranean waters along the Sicilian coast of the Strait of Messina (central Mediterranean) [23,24,25,26], providing important biological material for taxonomical studies since the eighteenth century [23,24,27,28]. Several studies of stranded species were carried out to relate the sagittae otolith size with the fish body size [24,27], the abundance of stranded organisms, and the causes of the stranding [27,29,30]. The upwelling of deep-water masses drags deep-sea organisms from their normal habitats. Then, tidal currents and favorable wind conditions are the main mechanisms of mesopelagic fish stranding in the straits [28]. Battaglia et al. [27,30] also reported that the phase of the moon promotes variability in both current strength and irradiance, thus affecting the vertical distribution of fishes.
In the Canary Islands, the distribution and DVM of epi- and mesopelagic species of fishes [31,32,33,34], decapods [32,33,35,36,37], cephalopods [32,33,34,38], and euphausiids [32,39] are well known. Recent studies around this archipelago have focused on the reproduction and growth of one the most abundant mesopelagic fish (Notoscopelus resplendens) [40,41], as well as the migratory pattern, vertical distribution, and diet of mesopelagic cephalopods (Abralia veranyi and Abraliopsis morisii) [42]. Furthermore, Ublein and Bordes [43] argued that topography also influenced the species distribution around these volcanic islands. Despite growing interest on the mesopelagic community in this area, strandings of mesopelagic fishes along the coast of the Canary Islands have never been documented before.
The aim of the present study was to report the first stranding event of mesopelagic fishes in the Canary Islands (east coast of Gran Canaria Island) and to provide information about the oceanographic conditions involved in the strandings. Specifically, some specimens were identified using taxonomic keys, although most of them were identified from the sagittae otolith shape. Additionally, otolith measurements were also taken to obtain the relationships among them. Finally, the remote sensing data of temperature, dissolved oxygen, current fields, wind, and net primary production were examined to explain the causative mechanisms of these strandings around the oceanic islands.

2. Materials and Methods

2.1. Collecting Samples

On 2 June 2021, myctophid fishes were found stranded along the “El Inglés” beach on the southern coast of Gran Canaria Island, Canary Islands (Figure 1). This beach corresponds to the eastern boundary of the Maspalomas dune field. Specimens (n = 432) were collected by hand from the sand approximately every 50 m along the coastline from north to south and were immediately stored at −20 °C. The time of exposure to the sun, beach cleaning services, and scavenger animals affected specimen condition. Consequently, only a reduced number of individuals (n = 22) were used for the taxonomic identification based on the number and position of photophores using traditional guides [44,45,46]. The remaining specimens were identified from the previously extracted sagittae otolith. The standard length (SL, in mm) was measured for each specimen.

2.2. Classification of Sagittae Otoliths

We used the AFORO website (http://isis.cmima.csic.es/aforo/ (accessed on 12 August 2022) [47]) for the identification of species using the otolith contour (n = 170). This website offers a wide-open online catalogue of otolith images (470) of myctophids (106 species) from the Mediterranean Sea and Atlantic Ocean. The online classifier is based on a contour analysis using wavelets [48,49] and the non-parametric k-means algorithm [47]. This database classified most of the similar species based on their otolith morphology, providing nine possible species. Considering the bias in using this database due to the number of images per species, we established the following criteria for the selection of species: (1) closest species based on otolith morphology, (2) number of times that a species was repeated among the nine possible solutions, and (3) the order of species appearance. Most specimens were assigned to Diaphus spp. (see results). Thus, we tested the final assignation with the morphological description provided by Schwarzhans [50] for this taxon. Otolith length (OL, in mm) and width (OW, in mm) were measured for each specimen as well as the aspect ratio (AR = OW/OL) and otolith relative length (OR = (100 × (OL/SL)) [51,52]. This protocol was also applied for the otoliths of specimens that were identified taxonomically.
The normality and homogeneity of variances of OL, OW, AR, and OR were checked for each morphotype using the Shapiro–Wilk test and the Bartlett test, respectively. The average value of both variables was compared using the Mann–Whitney U-test (non-parametric test) or Student’s t-test (parametric test). Analyses were performed using the package ggstatplot in R [52].

2.3. Oceanographic Characterization

We studied daily time-series data (from 1 February 2020 to 15 January 2022) of currents and winds at the surface (0.5 m depth) to examine the causative mechanisms of the strandings. The components of current (eastward and northward) and wind velocity in front of the sampled area (Station 1) were analyzed from the surface to a 1000 m depth. We also analyzed the sea surface temperature (SST, °C) and chlorophyll-a concentration (mg·m−3) from remote sensor data. We downloaded data (currents, wind and SST) from Copernicus Marine Environment Monitoring Service (http://marine.copernicus.eu/ (accessed on 30 August 2021)) with a spatial resolution of 9 × 9 km. Chlorophyll-a was obtained from NASA’s OceanColorWeb (https://oceancolor.gsfc.nasa.gov/ (accessed on 14 November 2022)) website. This had a spatial resolution of 4 × 4 km. We used the programming language R [52] to analyze and represent the results. The sampling map was generated using the geographic information system QGIS (V.3.22.3) [53].

3. Results

3.1. Taxonomic Classification and Otolith Shape

All the individuals with visible photophores were taxonomically identified as Diaphus dumerilii. Their otoliths presented a high variability in shape with few and strong ventral denticles and a round posterior region with a wide and variable postdorsal depression, which was slightly curved and moderately thick (Figure 2). The rostrum was slightly longer than antirostrum, showing variable shape and a wide excisura ostii with a shallow or absent notch. Two otoliths presented different morphologies to the patterns noted above, and they were considered rare (Figure 2). Overall, the morphological features displayed a high intraspecific variability in terms of the contour shape. Thus, the AFORO classifier assigned 62.5% of the otoliths to D. dumerilii, 33.3% to D. problematicus, and 4.2% to D. fragilis. When the classifier was used with the remaining otoliths (without being taxonomically identified), most individuals were identified as D. dumerilii (74%) and D. problematicus (11.3%) and to a lesser extent as D. adenomus (6.7%) D. fragilis (5.3%), D. vanhoeffeni (1.3%), D. malayanus (0.7%), and Lobianchia dofleini (0.7%) (Figure 3). However, taking into account the otolithic morphological features of these species, especially the curvature of the inner and outer face, we reassigned all the specimens as D. dumerilii except for the rare otoliths (Figure 2).
Two otolith contour outlines were differentiated in D. dumerilii depending on their dorsal and pre-dorsal rim: morpho-type 1 was classified when the dorsal rim was more developed (in the middle or closer to the anterior region) and the predorsal rim was strongly depressed, and morpho-type 2 was classified when the dorsal and predorsal rims were less developed and depressed in comparison to morpho-type 1 (Figure 2). Morpho-type 2 showed significantly higher values for OL (Mann–Whitney U-test = 2100, p < 0.001), OW (t-test = −2.76, p = 0.006), AR (t-test = −4.95, p < 0.001), and OR (t-test = −3.62, p < 0.001) than morpho-type 1 (Figure 4). This variability was not linked to differences in fish size between both morpho-types (Mann–Whitney U-test = 3144, p = 0.1456).

3.2. Oceanographic Conditions

An anticyclonic eddy was observed south of Gran Canaria, which recirculated offshore water towards the island coast during the previous days (26 May 2021; Figure 5A,C) and during the same day (2 June 2021; Figure 5B,D) of the stranding event. In addition, a filament of upwelling transporting colder water and chlorophyll from the African coast ended in the anticyclonic eddy shed by Gran Canaria Island (Figure 5C,D).
The total component of the current velocity and wind values (Figure 6) were higher near to the island (Station 1 and 2) than in the open ocean than the effect of the upwelling filament and the anticyclonic eddy (Figure 5B,D) during the previous month. Both the current and wind speed values were also high near to the island during May 2021. The direction of the current was almost the opposite of the effect of the convergence between the filament and the eddy south of the island (near the stranding site) (Figure 5).

4. Discussion

Our study was the first documented evidence of stranded mesopelagic fish in the Canary Islands. The stranded organisms were mostly Diaphus dumerilii (Myctophidae), an abundant species in this region [33,34,43]. The stranding of mesopelagic fishes is poorly documented worldwide, except for the Sicilian coast in the Strait of Messina in the Mediterranean Sea [23,26,54,55,56,57,58]. In this region, 32 species of the families Gonostomatidae, Microstomatidae, Myctophidae, Paralepididae, Phosichthyidae, Sternoptychidae, and Stomiidae were collected between 2008–2016 [57]. In the Canary Island waters, mesopelagic species consisting of ten species of Gonostomatidae, fifty-two Myctophidae, four Phosichthydae, nine Sternoptychidae, and fifty-two Stomidae were collected during oceanographic cruises [33,34,43], showing a high diversity in the area. The family Myctophidae was the most numerous taxon around the Canary Islands, and species such as Diaphus holti, D. dumerilii, and D. metopoclampus [27,57,58] showed the highest abundances. This genus contributes the highest number of species within the Myctophidae, being represented by 78 species in the world’s oceans, and 21 species are found in the equatorial and tropical Atlantic [46].
The identification of stranded fishes in the Strait of Messina was carried out according to the position of photophores [45]. Here, we identified D. dumerilii from the otolith contour. However, our identification was moderately successful due to the similarity of otoliths among the Diaphus species, especially in D. fragilis and D. problematicus. The main problems for identification were related to the short rostrum and elliptic shape of their otoliths in comparison with other species [50,59]. Furthermore, Schwarzhans [50] already described similarities in the morphological pattern of D. fragilis otoliths (including to D. fragilis and D. problematicus, among other species) and D. garmani groups (in which D. dumerilii is included). However, the thickness and curvature of the inner and outer faces allowed the reclassification of the specimens of D. dumerilii because the faces were more concave in D. fragilis and flattened in D. problematicus [50]. Thus, our review of otolith face concavity was of importance for elucidating the misclassifications, even the ones with an undulant dorsal rim, which share a morphological similarity with D. pedemontanus [60], a fossil species. In any case, the high variability in morphometry and the shape of the otoliths of D. dumerilii revealed intraspecific differences in growth. It is well documented that this variability is related to sexual dimorphism, feeding, or swimming ability, as was described in other fish species (e.g., in [59,61,62]).
The stranding of these species (Diaphus spp.) may be due to how they swim. According to the body and sagittae otolith shape [59], two morphotypes were determined (Diaphus-deep: D. brachycephalus, D. vanhoeffeni, D. holti, D. mollis, and D. rafinesqui; Diaphus-slender: D. dumerilii, D. fragilis, D. metopoclampus, and D. problematicus). These authors described that the characteristics of the Diaphus-deep morphotype improve the acceleration or explosive swimming of these fish even though they have a more robust body [62]. However, the Diaphus-slender morphotype has a more streamlined shape that improves their prolonged swimming ability [62]. In addition, according to the body shape [63] two additional morphotypes were described for Diaphus spp. (fusiform: D. dumerilii, D. vanhoeffeni, and L. dofleini; elongatum: D. fragilis). In our study, the species were classified as either the fusiform or Diaphus-slender morphotype, which facilitated a prolonged swimming that was not enough to overcome the strong currents in the area.
The analysis of the oceanographic scenario south of Gran Canaria Island showed the presence of an anticyclonic eddy and an upwelling filament before and during the period of stranding. Mesoscale structures leeward of the islands were described long ago [64,65,66]. Anticyclonic eddies act as retention zones for phytoplankton [64,67,68,69,70,71], zooplankton [72,73,74,75], invertebrate larvae [76], and fish larvae [72,77,78], affecting their distribution [77,79,80]. The upwelling of cold deep waters in the African coastal zone depends on the intensity of the Trade Winds. North of 25° N, the upwelling intensifies during summer [69,71,80,81] as the Trade Winds increase during this season. Upwelling filaments are generated by the interaction of eddies and the coast mostly during the Trade Wind season, and they also promote the offshore transport of phytoplankton [64,67,68,69,70,71], zooplankton [82,83], invertebrate larvae, and ichthyoplankton [72,77,78,79,84] from the African neritic zone, eventually reaching the Canary archipelago [68,69,70,77,83,84,85,86]. The filaments are relatively shallow structures less than 100 m deep, which can extend over hundreds of kilometers into the ocean [83]. Therefore, transport in the upwelling filament and retention in mesoscale structures such as the anticyclonic eddy were suggested to promote the transport of mesopelagic fishes to the coastal zone where these organisms were collected for this study. As the case for phytoplankton, zooplankton, fish, and invertebrate larvae transported by the filament towards the islands, mesopelagic fish were suggested to drift in the filament structure during their residence time at night in shallower layers because of their diel vertical migration. In this way, these organisms could be transported in a rather food-rich environment (zooplankton and other larvae in the filament) towards the anticyclonic eddy south of the island and then to over the island shelf by stronger currents. We posited that the strandings that occurred during dawn over the narrow shelf of the island were related to the feeding activity of these pelagic fish.
Interestingly [30,57], in the Mediterranean Sea, it was also concluded that the new and full moon influenced the strength of the currents. Days before to the stranding, we observed a full moon (26 May 2021, Figure 5A,C), which coincided with an increase in both the current and wind velocity during this period. However, during the stranding day, we recorded that the moon was in the last quarter. During the full moon, the vertical migration of zooplankton and micronekton to the upper layers of the water column is less than at other times [87,88,89,90,91], but the during the new and full moon phase the highest tidal intensity occurs [92]. Therefore, the migration occurred in the moon’s last quarter phase, and when the fish had already migrated upwards, this stronger tidal current, in combination with the upwelling transport and eddy circulation, could have facilitated the transport of the fishes deep inside the island shelf region.

5. Conclusions

The stranding of mesopelagic fish recorded in the south of Gran Canaria Island was the first documented evidence of this process in the Canary Islands and the Macaronesian region (Madeira, Azores, and Cape Verde Islands). Considering the volcanic nature of the islands (with narrow shelves) and the year-round presence of mesoscale oceanographic structures such as island wakes, eddies, and upwelling filaments, we suggest that this kind of stranding event should be common. In the future, the implementation of a monitoring program of these coastal sites in combination with satellite-derived environmental data will help to gather robust information about such events and what species are associated with these processes. This data will also allow us to assess changes in species richness.

Author Contributions

Conceptualization, A.N.S.-L.; data curation, A.N.S.-L. and V.M.T.; formal analysis, A.N.S.-L., M.C., A.L. and M.P.O.; investigation, A.N.S.-L., M.C. and V.M.T.; methodology, M.C.; supervision, V.M.T.; validation, M.P.O.; visualization, S.H.-L.; writing—original draft, A.N.S.-L.; writing—review and editing, M.C., A.L., M.P.O., J.M.L., S.H.-L. and V.M.T. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the Spanish Government through the Project Desafío (PID2020-118118RB-I00). Additional funding for this research came from the European Union (Horizon 2020 Research and Innovation Programme) through the projects SUMMER (Grant Agreement 817806) and TRIATLAS (Grant Agreement 817578). Airam Sarmiento was supported by a postgraduate grant (BES-2017-082540) and José M Landeira by the “Beatriz Galindo” grant (BEAGAL 18/00172) both from the Spanish Ministry of Science and Innovation. María Couret was supported by a postgraduate grant (TESIS2022010116) from the Agencia Canaria de Investigación, Innovación y Sociedad de la Información (ACIISI).

Institutional Review Board Statement

Ethical review and approval were waived for this study due to the fact that the samples were already dead at the time of collection. They were collected along the coastline.

Informed Consent Statement

Not applicable.

Data Availability Statement

The raw data supporting the conclusions of this article are publicly available through AFORO website (http://aforo.cmima.csic.es/ (accessed on 12 August 2022)) and PANGEA platform: Sarmiento-Lezcano, Airam Nauzet; Couret, María; Lombarte, Antoni; Olivar, M Pilar; Landeira, José María; Hernández-León, Santiago; Tuset, Victor M (2022): Otolith morphological measures of stranding mesopelagic fishes in the Canary Islands during June 2021. PANGAEA, https://doi.org/10.1594/PANGAEA.951480 (accessed on 12 August 2022).

Acknowledgments

We would like to thank to graduate students and researchers of the Biological Oceanography and Global Change Group (GOBCAG), the AFORO team and the Ecology and Conservation of Marine Resources group in CSIC for their assistance with fishes sampling. The Oceanography and Global Change Institute (IOCAG) supported the laboratory work.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Robinson, C.; Steinberg, D.K.; Anderson, T.R.; Arístegui, J.; Carlson, C.A.; Frost, J.R.; Ghiglione, J.F.; Hernández-León, S.; Jackson, G.A.; Koppelmann, R.; et al. Mesopelagic Zone Ecology and Biogeochemistry—A Synthesis. Deep Sea Res. Part II Top Stud. Oceanogr. 2010, 57, 1504–1518. [Google Scholar] [CrossRef]
  2. Gjøsaeter, J.; Kawaguchi, K. A Review of the World Resources of Mesopelagic Fish. FAO Fish. Tech. Pap. 1980, 193, 123–134. [Google Scholar] [CrossRef]
  3. Irigoien, X.; Klevjer, T.A.; Røstad, A.; Martinez, U.; Boyra, G.; Acuña, J.L.; Bode, A.; Echevarria, F.; Gonzalez-Gordillo, J.I.; Hernández-León, S.; et al. Large Mesopelagic Fishes Biomass and Trophic Efficiency in the Open Ocean. Nat. Commun. 2014, 5, 3271. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  4. Lam, V.; Pauly, D. Mapping the Global Biomass of Mesopelagic Fishes. Sea Around Us Proj. Newsl. 2005, 30, 4. [Google Scholar]
  5. Proud, R.; Cox, M.J.; Brierley, A.S. Biogeography of the Global Ocean’s Mesopelagic Zone Correspondence. Curr. Biol. 2017, 27, 113–119. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  6. Proud, R.; Olav Handegard, N.; Kloser, R.J.; Cox, M.J.; Brierley, A.S. From Siphonophores to Deep Scattering Layers: Uncertainty Ranges for the Estimation of Global Mesopelagic Fish Biomass. ICES J. Mar. Sci. 2019, 76, 718–733. [Google Scholar] [CrossRef] [Green Version]
  7. Drazen, J.C.; Sutton, T.T. Dining in the Deep: The Feeding Ecology of Deep-Sea Fishes. Ann. Rev. Mar. Sci. 2017, 9, 337–366. [Google Scholar] [CrossRef] [Green Version]
  8. Olivar, M.P.; Hulley, P.A.; Castellón, A.; Emelianov, M.; López, C.; Tuset, V.M.; Contreras, T.; Molí, B. Mesopelagic Fishes across the Tropical and Equatorial Atlantic: Biogeographical and Vertical Patterns. Prog. Oceanogr. 2017, 151, 116–137. [Google Scholar] [CrossRef]
  9. Salvanes, A.G.V.; Kristoffersen, J.B. Mesopelagic Fishes; Academic Press: Cambridge, MA, USA, 2001. [Google Scholar] [CrossRef]
  10. Eschmeyer, W.N.; Fricke, R.; van der, L.R. Catalog of Fishes, Electronic Version (3 January 2017); California Academy of Sciences: San Francisco, CA, USA, 2018. [Google Scholar]
  11. Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. Fishes of the World, 5th ed.; John Wiley & Sons, Inc.: Hoboken, NJ, USA, 2016. [Google Scholar]
  12. Sutton, T.T.; Wiebe, P.H.; Madin, L.; Bucklin, A. Diversity and Community Structure of Pelagic Fishes to 5000 m Depth in the Sargasso Sea. Deep Sea Res. Part II Top. Stud. Oceanogr. 2010, 57, 2220–2233. [Google Scholar] [CrossRef]
  13. Brierley, A.S. Diel Vertical Migration. Curr. Biol. 2014, 24, R1074–R1076. [Google Scholar] [CrossRef]
  14. Bernal, A.; Olivar, M.P.; Maynou, F.; de Puelles, M.L.F. Diet and Feeding Strategies of Mesopelagic Fishes in the Western Mediterranean. Prog. Oceanogr. 2015, 135, 1–17. [Google Scholar] [CrossRef]
  15. García-Seoane, E.; Wienerroither, R.; Mork, K.A.; Underwood, M.J.; Melle, W. Biogeographical Patterns of Meso- and Bathypelagic Fish along a Northeastern Atlantic Transect. ICES J. Mar. Sci. 2021, 78, 1444–1457. [Google Scholar] [CrossRef]
  16. Sutton, T.T. Vertical Ecology of the Pelagic Ocean: Classical Patterns and New Perspectives. J. Fish. Biol 2013, 83, 1508–1527. [Google Scholar] [CrossRef] [PubMed]
  17. Angel, M.V. Vertical Profiles of Pelagic Communities in the Vicinity of the Azores Front and Their Implications to Deep Ocean Ecology. Prog. Oceanogr. 1989, 22, 1–46. [Google Scholar] [CrossRef]
  18. Catul, V.; Gauns, M.; Karuppasamy, P.K. A Review on Mesopelagic Fishes Belonging to Family Myctophidae. Rev. Fish. Biol. Fish. 2011, 21, 339–354. [Google Scholar] [CrossRef]
  19. Longhurst, A.R.; Bedo, A.W.; Harrison, W.G.; Head, E.J.H.; Sameoto, D.D. Vertical Flux of Respiratory Carbon by Oceanic Diel Migrant Biota. Deep Sea Res. Part A Oceanogr. Res. Pap. 1990, 37, 685–694. [Google Scholar] [CrossRef]
  20. Arístegui, J.; Agustí, S.; Duarte, C.M. Respiration in the Dark Ocean. Geophys. Res. Lett. 2003, 30, 1041. [Google Scholar] [CrossRef] [Green Version]
  21. Hernández-León, S.; Olivar, M.P.; Fernández de Puelles, M.L.; Bode, A.; Castellón, A.; López-Pérez, C.; Tuset, V.M.; González-Gordillo, J.I. Zooplankton and Micronekton Active Flux Across the Tropical and Subtropical Atlantic Ocean. Front. Mar. Sci. 2019, 6, 535. [Google Scholar] [CrossRef] [Green Version]
  22. Saba, G.K.; Burd, A.B.; Dunne, J.P.; Hernández-león, S.; Martin, A.H.; Rose, K.A.; Salisbury, J.; Steinberg, D.K.; Trueman, C.N.; Wilson, R.W.; et al. Toward a Better Understanding of Fish-Based Contribution to Ocean Carbon Fl Ux. Limnol. Oceanogr. 2021, 66, 1639–1664. [Google Scholar] [CrossRef]
  23. Battaglia, P.; Malara, D.; Romeo, T.; Andaloro, F. Relationships between Otolith Size and Fish Size in Some Mesopelagic and Bathypelagic Species from the Mediterranean Sea (Strait of Messina, Italy). Sci. Mar. 2010, 74, 605–612. [Google Scholar] [CrossRef]
  24. Battaglia, P.; Malara, D.; Ammendolia, G.; Romeo, T. Relationships between Otolith Size and Fish Length in Some Mesopelagic Teleosts (Myctophidae, Paralepididae, Phosichthyidae and Stomiidae). J. Fish. Biol. 2015, 87, 774–782. [Google Scholar] [CrossRef] [PubMed]
  25. Berdar, A.; Cavaliere, A.; Cavallaro, G.; Giuffrè, G.; Potoschi, A. Lo Studio Degli Organismi Spiaggiati Nello Stretto Di Messina Negli Ultimi Due Secoli. Nat. Sicil SIV 1983, 7, 3–17. [Google Scholar]
  26. Cavallaro, M.; Ammendolia, G.; Andaloro, F.; Battaglia, P. First Record of the Mesopelagic Fish Diaphus dumerilii (Bleeker, 1856) in the Mediterranean Sea. Mar. Biodivers. 2017, 47, 585–588. [Google Scholar] [CrossRef]
  27. Battaglia, P.; Sabatino, G.; Ibáñez, A.L.; Andaloro, F. Morphology and Ontogenetic Changes in Otoliths of the Mesopelagic Fishes Ceratoscopelus maderensis (Myctophidae), Vinciguerria attenuata and V. poweriae (Phosichthyidae) from the Strait of Messina (Mediterranean Sea). Acta Zool. 2017, 99, 126–142. [Google Scholar] [CrossRef]
  28. Carlo, B.S.; Costanzo, G.; Fresil, E.; Guglielmo, L.; Ianoral, A. Feeding Ecology and Stranding Mechanisms in Two Lanternfishes, Hygophum benoiti and Myctophum punctatum. Mar. Ecol Prog Ser. 1982, 9, 13–24. [Google Scholar] [CrossRef]
  29. Vittoria, M.M.; Sergio, S.; Andrea, T.; Fabrizio, V.; Marco, O.; Capua, D. The Strait of Messina Where Deep-Sea Fishes Land on the Beach. Deep Sea Life 2017, 9, 12–14. [Google Scholar]
  30. Battaglia, P.; Pedà, C.; Malara, D.; Milisenda, G.; MacKenzie, B.R.; Esposito, V.; Consoli, P.; Vicchio, T.M.; Stipa, M.G.; Pagano, L.; et al. Importance of the Lunar Cycle on Mesopelagic Foraging by Atlantic Bluefin Tuna in the Upwelling Area of the Strait of Messina (Central Mediterranean Sea). Animals 2022, 12, 2261. [Google Scholar] [CrossRef]
  31. Badcock, J. The Vertical Distribution of Mesopelagic Fishes Collected on the SOND Cruise. J. Mar. Biol. Assoc. 1970, 50, 1001–1044. [Google Scholar] [CrossRef]
  32. Foxton, P. SOND Cruise 1965 Biological Sampling Methods and Procedures. J. Mar. Biol. Assoc. 1969, 49, 603–620. [Google Scholar] [CrossRef]
  33. Bordes, F.; Wienerroither, R.; Uiblein, F.; Moreno, T.; Bordes, I.; Hernández-García, V.; Caballero, C. Catálogo de Especies Meso y Batipelágicas. Peces, Moluscos y Crustáceos. Colectadas Con Arrastre En Las Islas Canarias, Durante Las Campañas Realizadas a Bordo de B/E “La Bocaina”; Instituto Canarios de Ciencias Marinas (ICCM), Agencia Canaria de Investigación: Las Palmas de GC, Spain, 2009; p. 326. [Google Scholar]
  34. Wienerroither, R.; Uibleina, F.; Bordes, F.; Moreno, T. Composition, Distribution, and Diversity of Pelagic Fishes around the Canary Islands, Eastern Central Atlantic. Mar. Biol. Res. 2009, 5, 328–344. [Google Scholar] [CrossRef]
  35. Ariza, A.; Landeira, J.M.; Escánez, A.; Wienerroither, R.; Aguilar de Soto, N.; Røstad, A.; Kaartvedt, S.; Hernández-León, S. Vertical Distribution, Composition and Migratory Patterns of Acoustic Scattering Layers in the Canary Islands. J. Mar. Syst. 2016, 157, 82–91. [Google Scholar] [CrossRef] [Green Version]
  36. Foxton, P. The Vertical Distribution of Pelagic Decapods [Crustacea: Natantia] Collected on the Sond Cruise 1965 I. The Caridea. J. Mar. Biol. Assoc. 1970, 50, 939–960. [Google Scholar] [CrossRef]
  37. Foxton, P. The Vertical Distribution of Pelagic Decapods [Crustacea: Natantia] Collected on the Sond Cruise 1965 II. The Penaidea and General Discussion. J. Mar. Biol. Assoc. 1970, 50, 960–1000. [Google Scholar] [CrossRef]
  38. Clarke, M.R. Cephalopoda Collected on the SOND Cruise. J. Mar. Biol. Assoc. 1969, 49, 961–976. [Google Scholar] [CrossRef]
  39. Baker, A.D.C. The Vertical Distribution of Euphausiids Near Fuerteventura, Canary Islands (‘Discovery’ Sond Cruise, 1965). J. Mar. Biol. Assoc. 1970, 50, 301–342. [Google Scholar] [CrossRef]
  40. Sarmiento-Lezcano, A.N.; Triay-Portella, R.; Castro, J.J.; Rubio-Rodríguez, U.; Pajuelo, J.G. Age-Based Life-History Parameters of the Mesopelagic Fish Notoscopelus resplendens (Richardson, 1845) in the Central Eastern Atlantic. Fish. Res. 2018, 204, 412–423. [Google Scholar] [CrossRef]
  41. Sarmiento-Lezcano, A.; Triay-Portella, R.; Guerra-Marrero, A.; Jiménez-Alvarado, D.; Rubio-Rodríguez, U.; Núñez-González, R.; Bordes, F.; Castro, J.J. Contribution to the Reproductive Ecology of Notoscopelus resplendens (Richardson, in the Central—Eastern Atlantic. Sci. Rep. 2020, 10, 15821. [Google Scholar] [CrossRef]
  42. Guerra-Marrero, A.; Hernández-García, V.; Sarmiento-Lezcano, A.; Jiménez-Alvarado, D.; Pino, A.S.; Castro, J.J. Migratory Patterns, Vertical Distributions and Diets of Abralia veranyi and Abraliopsis morisii (Cephalopoda: Enoploteuthidae) in the Eastern North Atlantic. J. Molluscan Stud. 2019, 86, 27–43. [Google Scholar] [CrossRef]
  43. Bordes, F.; Uiblein, F.; Castillo, R.; Barrera-Luján, A.; Castro, J.J.; Coca, J.; Gómez, J.; Hansen, K.; Hernández-García, V.; Merrett, N.; et al. Epi- and Mesopelagic FIshes, Acoustic Data, and SST Images Collected off Lanzarote, Fuerteventura and Gran Canaria, Canary Islands, during Cruise ‘La Bocaina 04-97’. In Informes Técnicos del Instituto Canario de Ciencias Marinas; Agencia Canaria de Investigación: Las Palmas de GC, Spain, 1999; pp. 1–45. [Google Scholar]
  44. Hulley, P.A. Results of the Research Cruises of FRV” Walther Herwig” to South America. LVIII. Family Myctophidae (Osteichthyes, Myctophiformes). Arch. Für Fisch. 1981, 31, 1–300. [Google Scholar]
  45. Hulley, P.A. Myctophidae Paris. In Fishes of the North-Eastern Atlantic and the Mediterranean; Whitehead, P., Bauchot, M., Hureau, J., Nielsen, J., Tortonese, E., Eds.; UNESCO: Paris, French, 1984; Volume 1, pp. 429–483. [Google Scholar]
  46. Hulley, P.A.; Paxton, J.R. Myctophidae. Bony Fishes, Part 1 (Elopiformes-Scorpaeniformes), The Living Marine Resources of the Eastern Central Atlantic 3; Carpenter, K., de Angelis, N., Eds.; FAO: Rome, Italy, 2016; Volume 3, pp. 1860–1928. [Google Scholar]
  47. Lombarte, A.; Chic, O.; Parisi-Baradad, V.; Olivella, R.; Piera, J.; Garca-Ladona, E. A Web-Based Environment from Shape Analysis of Fish Otoliths. The AFORO Database. Sci. Mar. 2006, 70, 147–152. [Google Scholar] [CrossRef] [Green Version]
  48. Parisi-Baradad, V.; Lombarte, A.; Garcia-Ladona, E.; Cabestany, J.; Piera, J.; Chic, O. Otolith Shape Contour Analysis Using Affine Transformation Invariant Wavelet Transforms and Curvature Scale Space Representation. Mar. Freshw. Res. 2005, 56, 795. [Google Scholar] [CrossRef]
  49. Parisi-Baradad, V.; Manjabacas, A.; Lombarte, A.; Olivella, R.; Chic, Ò.; Piera, J.; García-Ladona, E. Automated Taxon Identification of Teleost Fishes Using an Otolith Online Database—AFORO. Fish. Res. 2010, 105, 13–20. [Google Scholar] [CrossRef]
  50. Schwarzhans, W. A Comparative Morphological Study of the Recent Otoliths of the Genera Diaphus, Idiolychnus and Lobianchia (Myctophidae). Palaeo. Ichthyol. 2013, 13, 41–82. [Google Scholar]
  51. Lombarte, A.; Cruz, A. Otolith Size Trends in Marine Fish Communities from Different Depth Strata. J. Fish. Biol. 2007, 71, 53–76. [Google Scholar] [CrossRef]
  52. Sarmiento-Lezcano, A.N.; Couret, M.; Lombarte, A.; Olivar, M.P.; Landeira, J.M.; Hernández-León, S.; Tuset, V.M. Otolith Morphological Measures of Stranding Mesopelagic Fishes in the Canary Islands during June 2021. PANGAEA. 2022. Available online: https://doi.pangaea.de/10.1594/PANGAEA.951480 (accessed on 12 August 2022).
  53. QGIS Development Team. QGIS Geographic Information System. Open Source Geospatial Foundation 2022. Available online: https://www.qgis.org/es/site/ (accessed on 20 July 2022).
  54. Battaglia, P.; Ammendolia, G.; Romeo, T.; Andaloro, F. Finding of Eretmophorus kleinenbergi (Moridae) in the Central Mediterranean Sea 93 Years after Its Previous Record, with a First Description of Sagittae and Fresh Coloration. Mar. Biodiv Rec. 2012, 5, 1–3. [Google Scholar] [CrossRef]
  55. Cavallaro, M.; Battaglia, P.; Laurà, R.; Guerrera, M.; Abbate, F.; Germanà, A. The Morphology Ofphotophores in the Garrick, Cyclothone braueri (Family: Gonostomatidae): An Ultrastructure Study. Acta Zool. 2015, 96, 296–300. [Google Scholar] [CrossRef]
  56. Cavallaro, M.; Mammola, C.L.; Verdiglione, R. Structural and Ultrastructural Comparison of Photophores of Two Species of Deep-Sea Fishes: Argyropelecus Hemigymnus and Maurolicus muelleri. J. Fish. Biol 2004, 64, 1552–1567. [Google Scholar] [CrossRef]
  57. Battaglia, P.; Ammendolia, G.; Cavallaro, M.; Consoli, P.; Esposito, V.; Malara, D.; Rao, I.; Romeo, T.; Andaloro, F. Influence of Lunar Phases, Winds and Seasonality on the Stranding of Mesopelagic Fish in the Strait of Messina (Central Mediterranean Sea). Mar. Ecol. 2017, 38, e12459. [Google Scholar] [CrossRef]
  58. Battaglia, P.; Canese, S.; Ammendolia, G.; Romeo, T.; Sandulli, R.; Tunesi, L.; Andaloro, F. New Records and Underwater Observation Ofthe Rare Fish Scorpaenodes arenai (Osteichthyes: Scorpaenidae) from the Central and Western Mediterranean. Sea. It J. Zool 2015, 82, 454–458. [Google Scholar] [CrossRef] [Green Version]
  59. Tuset, V.M.; Olivar, M.P.; Otero-Ferrer, J.L.; López-Pérez, C.; Hulley, P.A.; Lombarte, A. Morpho-Functional Diversity in Diaphus sp. (Pisces: Myctophidae) from the Central Atlantic Ocean: Ecological and Evolutionary Implications. Deep Sea Res. Part I Oceanogr. Res. Pap. 2018, 138, 46–59. [Google Scholar] [CrossRef]
  60. Brzobohaty, R.; Nolf, D. Diaphus Otoliths from the European Neogene (Myctophidae, Teleostei). Bull. L’institut R. Sci. Nat. Belg. Sci. Terre 2000, 70, 185–206. [Google Scholar]
  61. Winlker, N.S.; Paz-Goicoechea, M.; Lamb, R.W.; Pérez-Matus, A. Diet Reveals Linkesbetween Morphology Ad Foraging in a Cryptic Temperate Reeffish. Ecol. Evol. 2017, 7, 1124–1134. [Google Scholar]
  62. Webb, P.W. Body Form, Locomotion and Foraging in Aquatic Vertebrates. Am. Zool. 1984, 24, 107–120. [Google Scholar] [CrossRef]
  63. Czudaj, S.; Möllmann, C.; Fock, H.O. Length–Weight Relationships of 55 Mesopelagic Fishes from the Eastern Tropical. North Atlantic: Across- and Within-species Variation (Body Shape, Growth Stanza, Condition Factor). J. Fish. Biol. 2022, 101, 26–41. [Google Scholar] [CrossRef]
  64. Arístegui, J.; Sangrá, P.; Hernández-León, S.; Cantón, M.; Hernández-Guerra, A.; Kerling, J.L. Island-Induced Eddies in the Canary Islands. Deep Sea Res. Part I Oceanogr. Res. Pap. 1994, 41, 1509–1525. [Google Scholar] [CrossRef]
  65. Tejera, A.; García-Weil, L.; Heywood, K.; Cantón-Garbín, M. Observations of Oceanic Mesoscale Features and Variability in the Canary Islands Area from ERS-1 Altimeter Data, Satellite Infrared Imagery and Hydrographic Measurements. Int. J. Remote Sens. 2002, 23, 4897–4916. [Google Scholar] [CrossRef]
  66. Sangrà, P.; Pascual, A.; Rodríguez-Santana, Á.; Machín, F.; Mason, E.; McWilliams, J.C.; Pelegrí, J.L.; Dong, C.; Rubio, A.; Arístegui, J.; et al. The Canary Eddy Corridor: A Major Pathway for Long-Lived Eddies in the Subtropical North Atlantic. Deep Sea Res. Part I Oceanogr. Res. Pap. 2009, 56, 2100–2114. [Google Scholar] [CrossRef]
  67. Basterretxea, G.; Arístegui, J. Mesoscale Variability in Phytoplankton Biomass Distribution and Photosynthetic Parameters in the Canary-NW African Coastal Transition Zone. Mar. Ecol Prog Ser. 2000, 197, 27–40. [Google Scholar] [CrossRef]
  68. Arístegui, J.; Tett, P.; Hernández-Guerra, A.; Basterretxea, G.; Montero, M.F.; Wild, K.; Sangrá, P.; Hernández-León, S.; Cantón, M.; García-Braun, J.A. The Influence of Island-Generated Eddies on Chlorophyll Distribution: A Study of Mesoscale Variation around Gran Canaria. Deep Sea Res. Part I Oceanogr. Res. Pap. 1997, 44, 71–96. [Google Scholar] [CrossRef]
  69. van Camp, L.; Nykjaer, L.; Mittelstaedt, E.; Schlittenhardt, P. Upwelling and Boundary Circulation off Northwest Africa as Depicted by Infrared and Visible Satellite Observations. Prog. Oceanogr. 1991, 26, 357–402. [Google Scholar] [CrossRef]
  70. Hernández-Guerra, A.; Arıstegui, J.; Cantón, M.; Nykjaer, L. Phytoplankton Pigment Patterns in the Canary Islands Area as Determined Using Coastal Zone Colour Scanner Data. Int. J. Remote Sens. 1993, 14, 1431–1437. [Google Scholar] [CrossRef]
  71. Barton, E.D.; Arístegui, J.; Tett, P.; Cantón, M.; García-Braun, J.; Hernández-León, S.; Nykjaer, J.; Almeida, C.; Almunia, J.; Ballesteros, S.; et al. The Transition Zone of the Canary Current Upwelling Region. Prog. Oceanogr. 1998, 41, 455–504. [Google Scholar] [CrossRef]
  72. Rodrıguez, J.M.; Barton, E.D.; Eve, L.; Hernández-León, S. Mesozooplankton and Ichthyoplankton Distribution around Gran Canaria, an Oceanic Island in the NE Atlantic. Deep Sea Res. Part I Oceanogr. Res. Pap. 2001, 48, 2161–2183. [Google Scholar] [CrossRef]
  73. Landeira, J.M.; Lozano-Soldevilla, F.; Hernández-León, S.; Barton, E.D. Spatial Variability of Planktonic Invertebrate Larvae in the Canary Islands Area. J. Mar. Biol. Assoc. 2010, 90, 1217–1225. [Google Scholar] [CrossRef]
  74. Hernández-León, S. Accumulation of Mesozooplankton in a Wake Area as a Causative Mechanism of the “Island-Mass Effect”. Mar. Biol. 1991, 109, 141–147. [Google Scholar] [CrossRef] [Green Version]
  75. Hernández-León, S. Gradients of Mesozooplankton Biomass and ETS Activity in the Wind-Shear Area as Evidence of an Island Mass Effect in the Canary Island Waters. J. Plankton Res. 1988, 10, 1141–1154. [Google Scholar] [CrossRef]
  76. Moyano, M.; Rodríguez, J.M.; Benítez-Barrios, V.M.; Hernández-León, S. Larval Fish Distribution and Retention in the Canary Current System during the Weak Upwelling Season. Fish. Oceanogr. 2014, 23, 191–209. [Google Scholar] [CrossRef]
  77. Rodríguez, J.M.; Barton, E.D.; Hernández-León, S.; Arístegui, J. The Influence of Mesoscale Physical Processes on the Larval Fish Community in the Canaries CTZ, in Summer. Prog. Oceanogr. 2004, 62, 171–188. [Google Scholar] [CrossRef] [Green Version]
  78. Olivar, M.P.; Sabatés, A.; Pastor, M.V.; Pelegrí, J.L. Water Masses and Mesoscale Control on Latitudinal and Cross-Shelf Variations in Larval Fish Assemblages off NW Africa. Deep Sea Res. Part I Oceanogr. Res. Pap. 2016, 117, 120–137. [Google Scholar] [CrossRef]
  79. Landeira, J.M.; Brochier, T.; Mason, E.; Lozano-Soldevilla, F.; Hernández-León, S.; Barton, E.D. Transport Pathways of Decapod Larvae under Intense Mesoscale Activity in the Canary-African Coastal Transition Zone: Implications for Population Connectivity. Sci. Mar. 2017, 81, 299. [Google Scholar] [CrossRef]
  80. Mittelstaedt, E. The Ocean Boundary along the Northwest African Coast: Circulation and Oceanographic Properties at the Sea Surface. Prog. Oceanogr. 1991, 26, 307–355. [Google Scholar] [CrossRef]
  81. Arístegui, J.; Barton, E.D.; Álvarez-Salgado, X.A.; Santos, A.M.P.; Figueiras, F.G.; Kifani, S.; Hernández-León, S.; Mason, E.; Machú, E.; Demarcq, H. Sub-Regional Ecosystem Variability in the Canary Current Upwelling. Prog. Oceanogr. 2009, 83, 33–48. [Google Scholar] [CrossRef] [Green Version]
  82. Hernández-León, S.; Almeida, C.; Portillo-Hahnefeld, A.; Gómez, M.; Rodríguez, J.M.; Arístegui, J. Zooplankton Biomass and Indices of Feeding and Metabolism in Relation to a Filament off the Northwest African Upwelling Zone. J. Mar. Res. 2002, 60, 327–346. [Google Scholar] [CrossRef]
  83. Hernández-León, S.; Gómez, M.; Arístegui, J. Mesozooplankton in the Canary Current System: The Coastal–Ocean Transition Zone. Prog. Oceanogr. 2007, 74, 397–421. [Google Scholar] [CrossRef]
  84. Rodrıguez, J.M.; Hernández-León, S.; Barton, E.D. Mesoscale Distribution of Fish Larvae in Relation to an Upwelling Filament off Northwest Africa. Deep Sea Res. Part I Oceanogr. Res. Pap. 1999, 46, 1969–1984. [Google Scholar] [CrossRef]
  85. Barton, E.D.; Arístegui, J.; Tett, P.; Navarro-Pérez, E. Variability in the Canary Islands Area of Filament-Eddy Exchanges. Prog. Oceanogr. 2004, 62, 71–94. [Google Scholar] [CrossRef]
  86. Rodríguez, J.M.; Moyano, M.; Hernández-León, S. The Ichthyoplankton Assemblage of the Canaries–African Coastal Transition Zone: A Review. Prog. Oceanogr. 2009, 83, 314–321. [Google Scholar] [CrossRef]
  87. Linkowski, T.B. Lunar Rhythms of Vertical Migrations Coded in Otolith Microstructure of North Atlantic Lanternfishes, Genus Hygophum (Myctophidae). Mar. Biol. 1996, 124, 495–508. [Google Scholar] [CrossRef]
  88. Tarling, G. The Effect of Lunar Eclipse on the Vertical Migration Behaviour of Meganyctiphanes norvegica (Crustacea: Euphausiacea) in the Ligurian Sea. J. Plankton Res. 1999, 21, 1475–1488. [Google Scholar] [CrossRef] [Green Version]
  89. Hernández-León, S.; Almeida, C.; Yebra, L.; Arístegui, J.; Fernández de Puelles, M.L.; García-Braun, J. Zooplankton Abundance in Subtropical Waters: Is There a Lunar Cycle? Sci. Mar. 2001, 65, 59–64. [Google Scholar] [CrossRef]
  90. Chiou, W.D.; Cheng, L.Z.; Chen, C.T. Effects of Lunar Phase and Habitat Depth on Vertical Migration patterns of the Sergestid Shrimp Acetes intermedius. Fish. Sci. 2003, 69, 277–287. [Google Scholar] [CrossRef]
  91. Benoit-Bird, K.J.; Au, W.W.L.; Wisdom, D.W. Nocturnal Light and Lunar Cycle Effects on Diel Migration of Micronekton. Limnol. Oceanogr. 2009, 54, 1789–1800. [Google Scholar] [CrossRef]
  92. Neumann, D. Tidal and Lunar Rhythms. Handbook of Behavioural Neurobiology; Aschoff, J., Ed.; Plenum: New York, NY, USA, 1981. [Google Scholar]
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Figure 1. Location of stranded mesopelagic fishes along “El Inglés” Beach (Gran Canaria Island, Spain). (A) Map of the eastern islands of the Canarian Archipelago. Numbers on the map are the locations where oceanographic variables were examined. (B) Source: IDECanarias, GRAFCAN, S.A. Canary Islands Government (2021).
Figure 1. Location of stranded mesopelagic fishes along “El Inglés” Beach (Gran Canaria Island, Spain). (A) Map of the eastern islands of the Canarian Archipelago. Numbers on the map are the locations where oceanographic variables were examined. (B) Source: IDECanarias, GRAFCAN, S.A. Canary Islands Government (2021).
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Figure 2. Image composition of otolith morphotypes according to the variability of shapes obtained from mesopelagic fish along the southeast coast of Gran Canaria island.
Figure 2. Image composition of otolith morphotypes according to the variability of shapes obtained from mesopelagic fish along the southeast coast of Gran Canaria island.
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Figure 3. Morphology of otoliths extracted in the mesopelagic fish species collected along the southeast coast of Gran Canaria.
Figure 3. Morphology of otoliths extracted in the mesopelagic fish species collected along the southeast coast of Gran Canaria.
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Figure 4. Otolith length (OL), width (OW), aspect ratio (AR), and otolith relative length (OR) for each specimen analyzed.
Figure 4. Otolith length (OL), width (OW), aspect ratio (AR), and otolith relative length (OR) for each specimen analyzed.
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Figure 5. (A,B) Remotely sensed image of sea surface temperature and (C,D) chlorophyll a concentration between Gran Canaria Island and the coastal zone off northwest Africa during 26th of May (A,C) and 2 June (B,D), 2021. Data was downloaded from the Copernicus Marine platform and NASA’s OceanColorWeb. Current direction and velocity are represented by black arrows. Velocity is proportional to the length of the arrows.
Figure 5. (A,B) Remotely sensed image of sea surface temperature and (C,D) chlorophyll a concentration between Gran Canaria Island and the coastal zone off northwest Africa during 26th of May (A,C) and 2 June (B,D), 2021. Data was downloaded from the Copernicus Marine platform and NASA’s OceanColorWeb. Current direction and velocity are represented by black arrows. Velocity is proportional to the length of the arrows.
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Figure 6. (A) Total component of current velocity (m·s−1) and (B) wind speed (m·s−1) from December 2020 to July 2021. Data were download through the Copernicus Marine platform. The velocity of the current due to the filament and the anticyclonic eddy was higher at Stations 1 and 2 near Gran Canaria Island during the stranding event (2 June 2021).
Figure 6. (A) Total component of current velocity (m·s−1) and (B) wind speed (m·s−1) from December 2020 to July 2021. Data were download through the Copernicus Marine platform. The velocity of the current due to the filament and the anticyclonic eddy was higher at Stations 1 and 2 near Gran Canaria Island during the stranding event (2 June 2021).
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Sarmiento-Lezcano, A.N.; Couret, M.; Lombarte, A.; Olivar, M.P.; Landeira, J.M.; Hernández-León, S.; Tuset, V.M. Stranding of Mesopelagic Fishes in the Canary Islands. Animals 2022, 12, 3465. https://doi.org/10.3390/ani12243465

AMA Style

Sarmiento-Lezcano AN, Couret M, Lombarte A, Olivar MP, Landeira JM, Hernández-León S, Tuset VM. Stranding of Mesopelagic Fishes in the Canary Islands. Animals. 2022; 12(24):3465. https://doi.org/10.3390/ani12243465

Chicago/Turabian Style

Sarmiento-Lezcano, Airam N., María Couret, Antoni Lombarte, María Pilar Olivar, José María Landeira, Santiago Hernández-León, and Víctor M. Tuset. 2022. "Stranding of Mesopelagic Fishes in the Canary Islands" Animals 12, no. 24: 3465. https://doi.org/10.3390/ani12243465

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