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Fish and Fisheries Under Ecosystem Changes

A Special Issue of Animals (ISSN 2076-2615) belonging to the section "Aquatic Animals".

Deadline for manuscript submissions: 28 February 2027 | Viewed by 1953

Editor


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Guest Editor
School of Health Sciences, Department of Nursing, International Hellenic University, Alexander Campus, 57400 Sindos, Thessaloniki, Greece
Interests: morphometric analysis; ichthyology; fish age and growth; fisheries management; systematic
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Special Issue Information

Dear Colleagues,

Aquatic ecosystems are increasingly affected by climate change, habitat loss, pollution, overfishing, and other human activities, and these stressors are significantly impacting fish stocks, biodiversity, and the sustainability of the world’s fisheries. Rising sea temperatures, ocean acidification, and changing hydrological patterns are disrupting the natural cycles of aquatic organisms, affecting reproduction, growth, migration, and species distribution. Such shifts generally contribute to biodiversity loss, a decline in wild fish populations, and reduced fishery yields. A critical emerging challenge is the spread of invasive fish species, which displace native species, introduce diseases, alter the balance of food chains, compete with economically valuable species for resources, and cause significant socio-economic losses. Genetic and genomic tools are essential for monitoring such invasions, helping us to estimate the risk of hybridization and study adaptive variations in native populations.

We are pleased to invite you to contribute to this Special Issue “Fish and Fisheries Under Ecosystem Changes” which aims to gather together the most advanced research investigating the effects of ecosystem changes on fish biology, population dynamics, community structure, and fishery sustainability. Aligned closely with the journal’s scope, it emphasizes interdisciplinary approaches to aquatic animal science, including ecological, physiological, and socio-economic dimensions.

Original research articles and reviews are welcome, and areas of interest may include, but are not limited to, the following topics:

  • The impacts of climate change on fish populations;
  • The ecology and economy of invasive species;
  • Genetic and genomic tools for population monitoring;
  • Fish physiology and behaviour under environmental stressors;
  • Shifts in fishery productivity, distribution, resilience and adaptive fishery management under ecosystem change.

I look forward to receiving your contributions.

Prof. Dr. George Minos
Guest Editor

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 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

  • fish biodiversity
  • fisheries management
  • ecosystem changes
  • climate change impacts
  • invasive species genetics
  • aquatic ecosystems
  • sustainable fisheries
  • habitat degradation
  • species competition
  • adaptive management

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Published Papers (3 papers)

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Research

21 pages, 5527 KB  
Article
Identifying Key Factors Associated with the Spatiotemporal Dynamics of Fish Assemblages in Subtropical River-Type Reservoir Ecosystems: Implications for Fishery Management and Conservation
by Chengjie Yin, Rongzhen Zhang, Zewen Feng, Xiaoning Shi, Renhui Li, Miao Xiang, He Zhang and Longgen Guo
Animals 2026, 16(18), 2892; https://doi.org/10.3390/ani16182892 - 14 Sep 2026
Viewed by 236
Abstract
Characterizing the spatiotemporal patterns of fish communities in subtropical river-type reservoirs provides useful baseline information for fisheries stewardship and aquatic ecosystem monitoring. This work investigated fish assemblages across 18 sampling sites within Shanxi Reservoir, Zhejiang Province, using an integrative approach combining gillnet surveys, [...] Read more.
Characterizing the spatiotemporal patterns of fish communities in subtropical river-type reservoirs provides useful baseline information for fisheries stewardship and aquatic ecosystem monitoring. This work investigated fish assemblages across 18 sampling sites within Shanxi Reservoir, Zhejiang Province, using an integrative approach combining gillnet surveys, hydroacoustic detection, and habitat parameter monitoring. Sampling was conducted during two periods: October 2022 (autumn, post-flood, fattening phase) and April 2023 (spring, normal water level, spawning phase). A total of 22 species were documented in spring and 21 in autumn, with Cyprinidae species predominating. Dominant species shifted seasonally, led by Hypophthalmichthys nobilis, Culter dabryi and Hemiculter leucisculus. Planktivores and carnivores were more abundant in spring, while omnivores increased in autumn. Spatially, fish populations were mainly concentrated in the shallow riverine zone (SRZ), predominantly comprising small- to medium-sized individuals. Mantel tests and Pearson correlation analyses identified associations between fish assemblage structure in the deep lake zone (DLZ) and environmental variables including dissolved oxygen, conductivity, chlorophyll a, and phytoplankton density and biomass. This study provides preliminary baseline data on fish community dynamics in Shanxi Reservoir and offers tentative observations that may help inform future zoned monitoring and ecological restoration planning. Full article
(This article belongs to the Special Issue Fish and Fisheries Under Ecosystem Changes)
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25 pages, 2392 KB  
Article
New Records of Isognomon Species from Crete, Greece; Evidence from Adult Specimens and Additional DNA Barcodes
by Papavasileiou Kyriakos, Giagkazoglou Zoi, Karagianni Athanasia, Sidiropoulou Dimitra, Loukovitis Dimitrios, Imsiridou Anastasia, Manousis Thanasis and Galinou-Mitsoudi Sofia
Animals 2026, 16(14), 2277; https://doi.org/10.3390/ani16142277 - 22 Jul 2026
Viewed by 439
Abstract
During the last two decades, non-indigenous species of the genus Isognomon have been increasingly reported in the Mediterranean Sea, yet their taxonomy and distribution remain poorly resolved because of pronounced shell plasticity and limited molecular reference data. In the present study, Isognomon specimens [...] Read more.
During the last two decades, non-indigenous species of the genus Isognomon have been increasingly reported in the Mediterranean Sea, yet their taxonomy and distribution remain poorly resolved because of pronounced shell plasticity and limited molecular reference data. In the present study, Isognomon specimens collected along the coasts of Crete (Greece) were examined, using an integrative approach combining adult morphometric analyses with mitochondrial (COI and 16S rRNA) and nuclear (28S rRNA) genetic markers. The results confirm the establishment of Isognomon bicolor in the eastern Mediterranean and document the presence of specimens morphologically consistent with I. australicus, which clustered within the unresolved I. legumen–I. aff. legumen complex in both mitochondrial and nuclear phylogenetic analyses. Morphometric analyses revealed pronounced shell plasticity, with shell width, hinge length, and nacreous height providing the greatest discriminatory power, although considerable overlap between taxa limited reliable identification based solely on shell morphology. Molecular analyses confirmed the identity of I. bicolor and further supported its eastward expansion within the Mediterranean basin. In contrast, the concordance between mitochondrial and nuclear datasets indicates that the unresolved taxonomy of the I. australicus–I. legumen complex is unlikely to result solely from the use of mitochondrial markers. These findings expand the available morphometric and genetic data for Mediterranean Isognomon populations and highlight the need for integrative taxonomic approaches, incorporating additional nuclear and genomic data to resolve species boundaries. Full article
(This article belongs to the Special Issue Fish and Fisheries Under Ecosystem Changes)
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19 pages, 1105 KB  
Article
eDNA-qPCR Reveals Spatial Biomass and Habitat Associations of the Endangered Brachymystax lenok tsinlingensis in Zhouzhi Heihe River
by Hu Zhao, Xiaoran An, Kunyang Zhang, Han Zhang, Jie Deng, Jianlu Zhang, Cheng Fang, Fei Kong, Wei Jiang, Qijun Wang, Xin Ding and Hongying Ma
Animals 2026, 16(13), 1957; https://doi.org/10.3390/ani16131957 - 24 Jun 2026
Viewed by 420
Abstract
Brachymystax lenok tsinlingensis is an endangered salmonid endemic to China. Traditional trapping methods frequently fail to detect this rare fish in low-density mountain streams, hampering evidence-based conservation. Here, we employed environmental DNA quantitative PCR (eDNA-qPCR) with species-specific primers to assess the spatial biomass [...] Read more.
Brachymystax lenok tsinlingensis is an endangered salmonid endemic to China. Traditional trapping methods frequently fail to detect this rare fish in low-density mountain streams, hampering evidence-based conservation. Here, we employed environmental DNA quantitative PCR (eDNA-qPCR) with species-specific primers to assess the spatial biomass distribution of this species in the Zhouzhi Heihe River. Concurrently, we surveyed plankton, benthic macroinvertebrates, and physicochemical water parameters. eDNA detected the target species at 12 of 14 sites, with reliable quantification achieved at 9 sites, suggesting that the method may be more effective than conventional trapping for detecting this species under the studied low-density conditions. eDNA-derived relative biomass exhibited pronounced spatial heterogeneity, ranging from 6.0 × 10−4 to 1.5 × 10−2 g/cm3. Water depth showed a significant positive association with biomass (r = 0.5347), whereas phytoplankton Shannon diversity (a measure of species richness and evenness) was significantly negatively correlated (r = −0.5447). Flow velocity displayed a negative trend that did not reach statistical significance (r = −0.5009). Plankton and benthic communities indicated overall ecological conditions but did not directly explain the observed spatial variation in fish biomass. These findings indicate that the spatial pattern of B. lenok tsinlingensis is primarily shaped by local physical habitat structure, with deeper, hydraulically more complex channel units serving as key microhabitats. eDNA-qPCR thus represents an effective, low-disturbance monitoring tool for this endangered cold-water fish and provides a scientific basis for targeted habitat protection and restoration. Full article
(This article belongs to the Special Issue Fish and Fisheries Under Ecosystem Changes)
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