Stress Ecology of Aquatic Animals

A Special Issue of Fishes (ISSN 2410-3888) belonging to the section "Environment and Climate Change".

Deadline for manuscript submissions: 20 October 2026 | Viewed by 2803

Editors


E-Mail Website
Guest Editor
Laboratory of Free Radical Processes, Institute of Neurobiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Interests: oxidative stress; stress ecology; antioxidants; marine pollution

E-Mail Website
Guest Editor
Laboratory of Free Radical Processes, Institute of Neurobiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Interests: ecology; oxidative stress; stress ecology; ecosystems; marine pollution

Special Issue Information

Dear Colleagues,

This Special Issue focuses on the stress responses of aquatic animals to multiple environmental stressors across different levels of biological organization. The aquatic environment contains many stressors, both of anthropogenic and natural origin, which can have additive, cumulative, and even antagonistic effects on organisms.

This issue aims to explore how the environmental stressors, alone or in combination, affect the sustainability of aquatic animals. Contributions that examine both acute and chronic stress responses (including experimental) of organisms from the molecular to the ecosystem level, including studies on adaptation, resilience, and vulnerability, are invited.

This issue seeks to bridge gaps in the current literature by integrating multidisciplinary approaches, promoting cross-taxa comparisons, and addressing underexplored regions or species. It builds on existing work in ecophysiology, aquatic ecology, and climate impact research of effects on aquatic animals, while encouraging novel frameworks such as stressomics, stress ecology, and holistic ecosystem-based approaches.

By situating these insights within the broader context of global environmental change, this issue aims to inform aquaculture and fisheries management, conservation strategies, and policy development. Ultimately, it will contribute to a deeper understanding of how aquatic animals cope with stress and what this means for the sustainability of aquatic ecosystems.

Fishes invites interested scientists to submit manuscripts relevant to this topic. The manuscripts will undergo careful review in a short period so that all accepted papers can be published in this Special Issue.

Prof. Dr. Albena Alexandrova
Prof. Dr. Nesho H. Chipev
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized 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

  • adaptation and resilience
  • aquatic pollution
  • climate change impacts
  • environmental stressors
  • marine ecophysiology
  • multi-stressor interactions

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Published Papers (2 papers)

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Research

30 pages, 5342 KB  
Article
Biological Stress Responses of Organisms to Microplastic Pollution in the Bulgarian Part of the Black Sea
by Albena Alexandrova, Nesho Chipev, Elina Tsvetanova, Madlena Andreeva, Svetlana Mihova, Selen Kyazim, Valentina Doncheva, Kremena Stefanova, Petya Ivanova, Elitsa Stefanova, Violin Raykov, Dimitar Dimitrov and Yordan Raev
Fishes 2026, 11(6), 312; https://doi.org/10.3390/fishes11060312 - 23 May 2026
Viewed by 1230
Abstract
Plastic pollution has emerged as one of the most pervasive environmental challenges, with microplastics (MPs) widely distributed across marine ecosystems worldwide. This study aimed to assess the uptake of MPs by key fish and invertebrate species from different locations in the coastal zone [...] Read more.
Plastic pollution has emerged as one of the most pervasive environmental challenges, with microplastics (MPs) widely distributed across marine ecosystems worldwide. This study aimed to assess the uptake of MPs by key fish and invertebrate species from different locations in the coastal zone of the Bulgarian Black Sea. Fish were collected during routine monitoring surveys in September–November 2024, while invertebrates were obtained via scuba diving. The presence of MPs in fish stomachs and invertebrate soft tissues, and their polymer composition, shape and size were analyzed using an Agilent 8700 LDIR Chemical Imaging System. Potential biological effects of ingested MPs were evaluated by an integrated Specific Oxidative Stress (SOS) index. The results revealed MP uptake levels comparable to those reported globally. Small-sized particles (<50 µm) with rounded shapes were most abundant across studied taxa. Polymer composition varied considerably depending on species and sampling region, indicating differences in exposure sources and environmental conditions. Oxidative stress levels in both fish and invertebrates showed substantial interspecific variation, and clear differences between the northern and southern region of the Bulgarian Black Sea. Overall, elevated uptake of MPs appears to contribute to oxidative stress in marine organisms, potentially affecting their health status, resilience, and adaptive capacity, as reflected by increased SOS index values. Full article
(This article belongs to the Special Issue Stress Ecology of Aquatic Animals)
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23 pages, 21519 KB  
Article
Bioaccumulation of Trace Elements in the Most Commercial Fish in the Southern Black Sea and Risk Estimates Related to Their Consumption
by Levent Bat, Süleyman Özdemir, Zekiye Birinci Özdemir and Ayşah Öztekin
Fishes 2026, 11(5), 295; https://doi.org/10.3390/fishes11050295 - 15 May 2026
Cited by 1 | Viewed by 920
Abstract
This study evaluates the accumulation of trace elements (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, Hg, and Pb) in the muscle tissues of six commercially important fish species (Scophthalmus maximus, Merlangius merlangus, Mullus ponticus, Trachurus mediterraneus [...] Read more.
This study evaluates the accumulation of trace elements (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Cd, Hg, and Pb) in the muscle tissues of six commercially important fish species (Scophthalmus maximus, Merlangius merlangus, Mullus ponticus, Trachurus mediterraneus, Engraulis encrasicolus, and Sprattus sprattus) harvested from multiple locations across the Sinop and Samsun coasts of the southern Black Sea during the 2023–2025 fishing seasons to assess potential human health risks. Element concentrations were quantified using inductively coupled plasma mass spectrometry (ICP-MS) and compared against national and international food safety standards. Results indicated that essential elements, particularly Fe and Zn, exhibited the highest concentrations, while Co and potentially toxic elements (Cd, Pb, As, and Hg) remained at lower levels. Although significant geographical variations in accumulation were observed between sampling locations, inter-species differences were relatively minor. Human health risk assessments, including Estimated Daily Intake (EDI), Target Hazard Quotient (THQ), and Carcinogenic Risk (CR), revealed that all THQ values were well below 1, indicating no non-carcinogenic concerns. Furthermore, CR values for As, Cr, and Pb fell within the acceptable range (10−6 to 10−4) defined by the U.S. EPA. Consequently, fish consumption from these regions poses no unacceptable risk, though localized element elevations suggest a need for enhanced environmental monitoring of pollution sources. Full article
(This article belongs to the Special Issue Stress Ecology of Aquatic Animals)
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