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Fishes
Special Issues
Rhythms in Marine Fish and Invertebrates
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Rhythms in Marine Fish and Invertebrates

A special issue of Fishes (ISSN 2410-3888). This special issue belongs to the section "Biology and Ecology".

Deadline for manuscript submissions: 20 June 2025 | Viewed by 2370

Special Issue Editors

Prof. Dr. José A. Muñoz-Cueto

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Guest Editor
Department of Biology, Faculty of Marine and Environmental Sciences, INMAR, University of Cadiz and SEA-EU, E11510 Puerto Real, Spain
Interests: aquaculture; fish neuroendocrinology; fish chronobiology; fish neuroanatomy; fish developmental biology
Prof. Dr. Francisco J. Sánchez-Vázquez

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Guest Editor
Department of Physiology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain
Interests: physiology; fish; aquaculture; chronobiology and welfare
Prof. Dr. Jingwen Yang

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Guest Editor
College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China
Interests: circadian; oscillators; melatonin; behavior; neuroendocrine; GPCR; biological rhythm; chronobiology; lunar rhythm
Prof. Dr. Tianming Wang

E-Mail Website1 Website2
Guest Editor
College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316022, China
Interests: echinoderm physiology; molecular and cellular biology; cell signaling; neuroendocrine; physiological ecology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Earth’s organisms have evolved endogenous biological rhythms, or biological clocks, essential for adapting to environmental changes. These rhythms are particularly crucial in marine ecosystems, where habitats such as mangroves, coral reefs, bay estuaries, and deep-sea vents host diverse species. Marine organisms have specific biological rhythms suited to their unique ecological niches, with light intensity and wavelength varying significantly with ocean depth. Unlike terrestrial species, marine life is influenced by light cycles as well as the moon and tides. Thus, studying the rhythmic characteristics and regulatory mechanisms in marine organisms is of great scientific importance. This Special Issue invites original research and review articles exploring the rhythmic traits, adaptations, and regulatory mechanisms of marine fish and invertebrates. We welcome studies utilizing genomic analysis, molecular and cellular biology, neuroendocrine research, physiology, behaviorology, and ecology. This research will deepen our understanding of how environmental factors influence biological rhythms and how these rhythms have evolved to align with environmental changes.

Prof. Dr. José A. Muñoz-Cueto
Prof. Dr. Francisco J. Sánchez-Vázquez
Prof. Dr. Jingwen Yang
Prof. Dr. Tianming Wang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fishes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • circadian
  • oscillators
  • melatonin
  • behavior
  • neuroendocrine
  • GPCR
  • biological rhythm
  • chronobiology
  • lunar rhythm

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Published Papers (2 papers)

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Research

26 pages, 4940 KiB  
Article
Integration of Gill and Intestinal Osmoregulatory Functions to Assess the Smoltification Window in Atlantic Salmon
by Jonás I. Silva-Marrero, Floriana Lai, Sigurd O. Handeland, Cindy Pedrosa, Virginie Gelebart, Pablo Balseiro, Juan Fuentes, Ivar Rønnestad and Ana S. Gomes
Fishes 2025, 10(3), 119; https://doi.org/10.3390/fishes10030119 - 8 Mar 2025
Viewed by 1070
Abstract
The transfer time of Atlantic salmon smolts from freshwater to seawater remains a challenge in aquaculture, with the “smolt window” referring to the optimal timeframe for seawater readiness. Our study monitored Atlantic salmon osmoregulatory adaptations during smoltification under continuous light (LL) and winter [...] Read more.
The transfer time of Atlantic salmon smolts from freshwater to seawater remains a challenge in aquaculture, with the “smolt window” referring to the optimal timeframe for seawater readiness. Our study monitored Atlantic salmon osmoregulatory adaptations during smoltification under continuous light (LL) and winter signal regime (6 weeks LD 12:12) followed by 6 or 8 weeks of constant light. Fish were subsequently reared in seawater for 8 weeks and subjected to a stress event of cyclic hypoxia at the conclusion of the trial. Significant differences in growth trajectories were observed between the LL and LD groups, with fish receiving the winter signal showing compensatory growth after seawater transfer. Gill Na+/K+-ATPase (NKA) activity, plasma ions, glucose, and cortisol levels confirmed the importance of the winter signal for seawater adaptation. Molecular markers, including nka isoforms, Na+-K+-2Cl− cotransporter (nkcc), cystic fibrosis transmembrane conductance regulator (cftr), and Na+/HCO3− cotransporter (nbc), showed distinct temporal expression patterns, particularly in gills and midgut. Notably, the LD group with delayed seawater transfer exhibited enhanced growth and improved hypo-osmoregulatory capacity. These findings underscore the advantages of a winter signal in smoltification and suggest that delaying seawater transfer for up to 8 weeks could be beneficial. Full article
(This article belongs to the Special Issue Rhythms in Marine Fish and Invertebrates)
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15 pages, 15465 KiB  
Article
Functional Involvement of Melatonin and Its Receptors in Reproductive Regulation of the Marine Teleost, Large Yellow Croaker (Larimichthys crocea)
by Xudong Liang, Jixiu Wang, Baoyi Huang, Haojie Yuan, Yucheng Ren, Chenqian Wu, Tianming Wang and Jingwen Yang
Fishes 2025, 10(1), 28; https://doi.org/10.3390/fishes10010028 - 10 Jan 2025
Cited by 3 | Viewed by 805
Abstract
Melatonin is a critical regulator of biological rhythms across organisms, transducing light signals into neuroendocrine signals that facilitate reproductive regulation in response to environmental cues. However, the precise mechanisms through which melatonin regulates reproduction in fish require further investigation. In this study, we [...] Read more.
Melatonin is a critical regulator of biological rhythms across organisms, transducing light signals into neuroendocrine signals that facilitate reproductive regulation in response to environmental cues. However, the precise mechanisms through which melatonin regulates reproduction in fish require further investigation. In this study, we employed molecular and organizational biological techniques to examine the expression patterns of melatonin and its five receptor subtypes (LcMTNR1A1, LcMTNR1A2, LcMTNR1B1, LcMTNR1B2, and LcMTNR1C) in various tissues of the large yellow croaker (Larimichthys crocea). Our results revealed significant expression of all receptors in the pituitary and testes, with distinct gender differences, including a lack of expression in the ovary. Moreover, our data indicate that melatonin and its receptors are primarily expressed during stage III, highlighting their role in sexual maturity. Enzyme- linked immunosorbent assay (ELISA) results further demonstrated that in vitro melatonin incubation in the brain of L. crocea influenced gonadotropin-releasing hormone (GnRH) and testosterone secretion in a dose-dependent manner, suggesting actions beyond the classical hypothalamic–pituitary–gonadal (HPG) axis. Overall, our findings provide new evidence supporting the role of the melatonin system in reproductive regulation in marine teleosts. Full article
(This article belongs to the Special Issue Rhythms in Marine Fish and Invertebrates)
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