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Oceans, Volume 6, Issue 4

2025 December - 25 articles

Cover Story: Τhe trophic ecology of Pterois miles in the Mediterranean Sea was performed by integrating data from stomach contents (SCA) and stable isotope analyses (SIAs), based on samples caught off the Greek island of Rhodes, SE, Aegean Sea, for the first time. This combined approach provides information on ingested (SCA) and assimilated (SIA) food and thus allows for the depiction of predator–prey relationships. Specimens of devil firefish, including both juveniles and adults (total length of analyzed specimens spanned from 11.40 to 31.50 cm), were collected from different sites around Rhodes. Their diet consisted of bony fish, cephalopods, crustaceans, and gastropods. The δ13C and δ15N values ranged from −18.0 ‰ to −14.4 ‰ and from 7.2 ‰ to 9.2 ‰, respectively. View this paper
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Articles (25)

  • Article
  • Open Access
1,273 Views
28 Pages

Annotated Checklist and Biodiversity of Sea Cucumbers (Holothuroidea) in Indian Waters

  • Karthika Padmini,
  • Ameen Ummath,
  • Atikulla Shaikh and
  • Balu Alagar Venmathi Maran

18 December 2025

Holothuroids play a vital role in nutrient cycling and bioturbation to enhance the marine ecosystem. They enhance the biodiversity for various symbiotic marine organisms by providing essential shelter and spawning grounds. This review focuses on the...

  • Feature Paper
  • Article
  • Open Access
986 Views
12 Pages

Trophic Ecology of the Devil Firefish Pterois miles in the Eastern Mediterranean: An Integrated Study Based on Stomach Content and Stable Isotope Analyses

  • Kassandra Zannaki,
  • Ioannis E. Batjakas,
  • Gerasimos Kondylatos,
  • Maria Corsini-Foka,
  • Chrysoula Gubili,
  • Evangelia Krasakopoulou,
  • Ernesto Azzurro and
  • Emanuela Fanelli

12 December 2025

Τhe trophic ecology of Pterois miles in the Mediterranean Sea was performed by integrating data from stomach contents (SCA) and stable isotopes analyses (SIA), based on samples caught off the Greek island of Rhodes, SE, Aegean Sea, for the first...

  • Article
  • Open Access
922 Views
13 Pages

3 December 2025

Two new species of free-living marine nematodes were collected in the Yellow Sea, China, and they are described herein as Actinonema sinica sp. nov. and Comesoma zhangi sp. nov. Actinonema sinica sp. nov. is characterized by short cephalic setae; lat...

  • Article
  • Open Access
1 Citations
634 Views
18 Pages

Predicting Chlorophyll-a in the Mauritanian–Senegalese Coastal Upwelling from Tropical Sea Surface Temperature

  • Elena Calvo-Miguélez,
  • Belén Rodríguez-Fonseca,
  • Víctor Galván-Fraile and
  • Iñigo Gómara

1 December 2025

The Mauritanian–Senegalese Coastal Upwelling exhibits strong interannual variability, which has been found to be driven by El Niño-Southern Oscillation (ENSO). In addition, ENSO has been shown to be triggered by the Indian Ocean and Atla...

  • Article
  • Open Access
629 Views
15 Pages

Persistent Geographic Patterns of Coral Recruitment in Hawaiʻi

  • Gregory P. Asner,
  • Rachel R. Carlson,
  • Caleb Labo,
  • Dominica E. Harrison and
  • Roberta E. Martin

1 December 2025

Coral life cycle dynamics are poorly understood in most reefs, especially at the large geographic scales commensurate with ocean transport, genetic flow, and other synoptic scale processes. We present a spatially explicit, large-scale, and multi-temp...

  • Article
  • Open Access
1,001 Views
13 Pages

Role of Salinity on Phosphorous Removal by Chaetoceros muelleri

  • Glacio S. Araújo,
  • Clarice S. Santigado,
  • Lucas C. B. Silva,
  • João Cotas and
  • Leonel Pereira

18 November 2025

The present work aims to verify the growth (estimated with optical density) of the dry biomass after proper flocculation and weighing, and removal of phosphorus by the microalga Chaetoceros muelleri (Mediophyceae), at six different salinities. Cultiv...

  • Article
  • Open Access
1,375 Views
14 Pages

Dolphins ‘Orient-Against-Current’: Foraging in Dredged Channels

  • Eliza M. M. Mills,
  • Sarah Piwetz and
  • Dara N. Orbach

14 November 2025

Bottlenose dolphins (Tursiops sp.) are opportunistic foragers with global distributions that utilize diverse feeding tactics based on environmental factors, habitat features, prey behavior, group dynamics, and genetics. We describe a unique foraging...

  • Article
  • Open Access
792 Views
21 Pages

Role of Lee Wave Turbulence in the Dispersion of Sediment Plumes

  • Alban Souche,
  • Ebbe H. Hartz,
  • Lars H. Rüpke and
  • Daniel W. Schmid

12 November 2025

Sediment plumes threatening benthic ecosystems are one of the environmental hazards associated with seafloor interventions such as bottom trawling, cabling, dredging, and marine mining operations. This study focuses on sediment plume release from hyp...

  • Article
  • Open Access
1 Citations
865 Views
16 Pages

Chaetognaths (Chaetognatha: Sagittoidea) at the Boundary of the Pacific Ocean and the Gulf of California: Their Relationship with the Summer Circulation Pattern

  • Mitzi Paulina de La Rosa-Bernal,
  • Elizabeth Durán-Campos,
  • María Adela Monreal-Gómez,
  • Erik Coria-Monter,
  • David Alberto Salas-de-León and
  • Sergio Cházaro-Olvera

12 November 2025

Chaetognaths play an essential role in zooplankton communities and significantly contribute to their overall biomass. Changes in the hydrographic properties of the water column, driven by hydrodynamic processes, affect their species richness and abun...

  • Article
  • Open Access
881 Views
15 Pages

The Large-Scale Geostrophic Circulation Around Cuba: Insights from Altimeter Data

  • Roberto Iacono,
  • Massimiliano Palma,
  • Ernesto Napolitano and
  • Alain Muñoz Caravaca

11 November 2025

Due to the scarcity of in situ observations, the current description of the circulation around Cuba is far from complete. For example, the structure and variability of the flow through the Windward Passage, which hosts a significant fraction of the t...

  • Article
  • Open Access
1,263 Views
26 Pages

7 November 2025

Maritime accidents are low-probability, high-consequence events, making mechanism analysis crucial for risk mitigation. Existing studies often focus on single scenarios or factors and frequently mix pre-incident observational data with subjective uns...

  • Article
  • Open Access
684 Views
16 Pages

Tidal-Phase Discharge Strategy Significantly Enhances Sewage Dilution Trapped in Deep Tidal Passages

  • Qinsi Chen,
  • Yingyu Tan,
  • Song Hu,
  • Xiaohua Wang,
  • Heng Zhao,
  • Pengxia Liu and
  • Xing Liu

6 November 2025

Tidal dynamics substantially govern nearshore circulation patterns. The discharge of sewage at different tidal stages may have a significant impact on the dilution of pollutants. However, discussions on tidal phase sewage discharge strategy are still...

  • Feature Paper
  • Article
  • Open Access
1,094 Views
20 Pages

Low Genetic Diversity and Decreased Effective Population Sizes of Acropora hyacinthus Populations Inhabiting Inshore and Offshore Reefs in the South China Sea

  • Yijin Di,
  • Lingyu Zheng,
  • Jingzhao Ke,
  • Yinyin Zhou,
  • Shaoyang Mo,
  • Xiangbo Liu,
  • Jiquan Lin,
  • Yuxiao Ren,
  • Duanjie Huang and
  • Xiubao Li
  • + 1 author

4 November 2025

Coral reefs, with their high biodiversity and ecological service functions, face significant threats due to climate change, overfishing, and pollution. The South China Sea (SCS) hosts rich coral biodiversity, particularly Acropora hyacinthus, a criti...

  • Review
  • Open Access
1,642 Views
22 Pages

Systematic Analysis of Threats to Sea Turtles in Mexico: Trends, Knowledge Gaps, and Implications for Conservation

  • Ruth I. Ramírez-Villanueva,
  • Fernando Gumeta-Gómez and
  • Gustavo Hinojosa-Arango

4 November 2025

Current scientific knowledge about the threats jeopardizing the recovery of sea turtle populations in Mexico is essential for improving conservation strategies. This study presents the results of a systematic review of the scientific literature publi...

  • Article
  • Open Access
2,432 Views
20 Pages

Combining Adequate BRUV Deployment Times with Individual Photo-Identification Improves Monitoring of Shark Populations in the Caribbean

  • Johanna Kohler,
  • Mauvis Gore,
  • Rupert Ormond,
  • Katherine Mason,
  • Anne Veeder and
  • Timothy Austin

22 October 2025

Sharks play a key role in coral reef ecosystems, but Caribbean populations are concerningly low. When monitoring endangered species, it is critical to use minimally invasive tools and protocols that are adequate for local species and the environment....

  • Article
  • Open Access
702 Views
14 Pages

Decadal Trends in Buoyancy, Internal Modes and Horizontal Dynamics in the Northern Ionian Sea

  • Gian Luca Eusebi Borzelli,
  • Ernesto Napolitano,
  • Roberto Iacono and
  • Maria Vittoria Struglia

18 October 2025

The Ionian Sea plays a crucial role as a crossroads for various Mediterranean water masses, making it a significant factor in the seawater budgets, biogeochemistry, and biodiversity of the subbasins of the Mediterranean Sea. In recent years, numerous...

  • Article
  • Open Access
1 Citations
1,350 Views
17 Pages

17 October 2025

Increased seawater temperatures and nutrient loading are stressors that affect coral reefs and their microbiomes. In this study, filamentous algae were collected and exposed to different temperatures and nutrient concentrations through a laboratory e...

  • Article
  • Open Access
2,300 Views
15 Pages

Interactions Between Tourism Vessels and Humpback Whales in the Gulf of Tribugá, Colombia

  • Laura Valentina Girón-Castaño,
  • Ann Carole Vallejo,
  • Isabel C. Avila and
  • Alan Giraldo

13 October 2025

Whale-watching is a growing ecotourism activity in Colombia that offers economic benefits but may pose behavioral risks to humpback whales (Megaptera novaeangliae) if not properly managed. Although preventive recommendations exist to promote sustaina...

  • Article
  • Open Access
924 Views
18 Pages

10 October 2025

The increased presence of harmful algal blooms (HABs) is a concern for many aquatic environments, especially with the increasing effects of climate change. Members of the dinoflagellate genus Dinophysis have been shown to produce toxins that can caus...

  • Article
  • Open Access
943 Views
16 Pages

Influence of Inorganic Nutrients on a North Atlantic Microbial Community’s Response to Ocean Alkalinity Enhancement

  • Inês de Castro,
  • Susana C. Ribeiro,
  • António Louvado,
  • Newton Carlos Marcial Gomes,
  • Mário Cachão,
  • Paulo F. Silva Borges,
  • Eduardo Brito de Azevedo and
  • Joana Barcelos e Ramos

9 October 2025

Ocean Alkalinity Enhancement (OAE) is a promising carbon dioxide removal strategy, but its ecological impacts on marine microbial communities under varying nutrient conditions remain poorly understood. We conducted laboratory incubations using a natu...

  • Article
  • Open Access
1,208 Views
17 Pages

9 October 2025

Macroplastic pollution is a growing environmental concern, threatening the marine environment. Despite growing awareness of marine plastic pollution, few studies have assessed the effectiveness of in situ technologies such as safety nets for macropla...

  • Article
  • Open Access
1,779 Views
21 Pages

Hemispherical Distribution of Antarctic Krill Indicates High Abundance in Amundsen Sea

  • Molly Thornborrow,
  • Andrew S. Brierley,
  • Roland Proud,
  • Inigo Everson,
  • Joshua M. Lawrence,
  • Matteo Bernasconi and
  • Paul G. Fernandes

2 October 2025

Antarctic krill (Euphausia superba) are an essential source of food for whale, seal, several fish, squid and seabird species in the Southern Ocean. Krill also play a major role in biogeochemical cycling and are the target of a growing commercial fish...

  • Article
  • Open Access
1,457 Views
14 Pages

Experimental Study on the Growth Pattern and Flexural Strength Characteristics of Rafted Ice

  • Ying Xu,
  • Wei Li,
  • Kuankuan Wu,
  • Sichong Ma,
  • Guojun Wang,
  • Yuepeng Li and
  • Dayong Zhang

29 September 2025

As a critical factor in ice load calculation for marine structures in cold regions, the growth mechanism and mechanical properties of rafted ice urgently require clarification. This study systematically investigated the growth patterns and flexural s...

  • Article
  • Open Access
2,173 Views
18 Pages

Distribution Patterns and Diversity of Sedimental Microbial Communities in the Tianxiu Hydrothermal Field of Carlsberg Ridge

  • Fangru Li,
  • Xiaolei Liu,
  • Weiguo Hou,
  • Hailiang Dong,
  • Jinglong Hu,
  • Hongyu Chen,
  • Yi Ding,
  • Yuehong Wu and
  • Xuewei Xu

24 September 2025

Hydrothermal vents, widely occurring along middle-ocean ridges and volcanic arcs, have been well-studied in vent-associated microbiology, mineralogy, and geochemistry. However, there are rarely investigations regarding the detailed microbial communit...

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Oceans - ISSN 2673-1924