Ecohydrology and River Connectivity: Implications for Fish Conservation

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

Deadline for manuscript submissions: 20 October 2026 | Viewed by 559

Special Issue Editors


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Guest Editor
Nanjing Hydraulic Research Institute, State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing 210029, China
Interests: hydraulics and river dynamics; engineering hydraulics for fishways, navigation channel and dam failure; ecosystem health assessment of rivers and lakes; scientific demonstration of evaluation index systems; water environment improvement; engineering measures for water ecological restoration of rivers and lakes
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Guest Editor
Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan 430079, China
Interests: fish passage; hydroecology; fish swimming behavior; fish habitat; river connectivity
College of Fisheries, Southwest University, Chongqing 400715, China
Interests: aquatic ecology; the conservation of fish resources; aggregation-induced emission fluorogen; methylmercury bioaccumulation; ecosystem health assessment of rivers and lakes

Special Issue Information

Dear Colleagues,

Anthropogenic disturbances to river connectivity and hydrological regimes pose critical threats to freshwater ecosystems, resulting in substantial declines in biodiversity, habitat quality, and fish population sustainability. This Special Issue, “Ecohydrology and River Connectivity: Implications for Fish Conservation,” provides an interdisciplinary platform to highlight recent advances in fish passage, hydraulic engineering, aquatic ecology, and river restoration science. This Special Issue aims to consolidate high-quality research that supports the conservation of freshwater fishes and fishery resources, as well as the ecological health of rivers and lakes, through innovative ecohydrological approaches and sustainable management strategies.

The scope of this Special Issue includes studies on the hydraulics, design, and effectiveness of fish passage facilities, fish behavior and movement ecology, and the restoration of river–lake connectivity and aquatic habitats. Contributions addressing ecosystem health assessment, advanced monitoring and analytical technologies, and the physiological or toxicological responses of fishes to hydrological alteration, habitat fragmentation, and contaminant exposure are also encouraged. By integrating engineering innovation with ecological understanding, this Special Issue seeks to provide robust scientific evidence and practical insights for improving river connectivity and promoting the long-term conservation and sustainable management of freshwater fishes and aquatic ecosystems.

Best regards,

Prof. Dr. Xiaogang Wang
Prof. Yiqun Hou
Dr. Tao He
Guest Editors

Manuscript Submission Information

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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

  • fish passage
  • river connectivity
  • ecohydrology
  • fish behavior
  • fish habitat
  • fish passage monitoring and evaluation
  • fish passage hydraulics
  • fish toxicology
  • fish resources conservation
  • river and lake ecosystem health

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Published Papers (2 papers)

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Research

17 pages, 6993 KB  
Article
Effects of Simulated Tunnel Darkness on Histology of Schizothorax macropogon
by Yanlin Wei, Hongze Li, Junjie Huang, Wei Liu, Jianguang Qin, Jianzhang Lv and Tao He
Fishes 2026, 11(6), 340; https://doi.org/10.3390/fishes11060340 (registering DOI) - 5 Jun 2026
Abstract
Schizothorax macropogon is an endemic fish species of the Tibetan Plateau whose distribution largely overlaps with hydropower facilities. In this study, the fish were exposed to simulated tunnel darkness for 7 days to evaluate microstructural changes in the gills, dorsal muscle, and midgut. [...] Read more.
Schizothorax macropogon is an endemic fish species of the Tibetan Plateau whose distribution largely overlaps with hydropower facilities. In this study, the fish were exposed to simulated tunnel darkness for 7 days to evaluate microstructural changes in the gills, dorsal muscle, and midgut. The results showed that gill lamellae exhibited divergent trends with continued bending and shortening in the dark group, contrasting with rupture in the control group. Moreover, the number of mitochondria-rich cells in the dark group increased initially and then decreased, while remaining stable and evenly distributed in the control group. No significant pathological damage was observed in the skeletal muscles of both groups, and muscle fiber diameters displayed a “V”-shaped trend over time in both groups. However, muscle fiber diameters were significantly smaller in the dark group than in the control group. Furthermore, intestinal villus height decreased continuously over time in both groups, with goblet cell numbers initially rising before falling and consistently remaining lower in the dark group compared to the control group. These findings suggest that short-term exposure to darkness may disrupt circadian rhythms, induce behavioral anomalies and energy metabolism disorders, leading to microstructural alterations in gill, muscle, and intestinal tissues that reflect either adaptation or damage. This study provides histological insights into the physiological effects of tunnel darkness on fish and offers key scientific evidence for optimizing lighting conditions in plateau tunnel fishways. Full article
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14 pages, 6416 KB  
Article
Research on the Adaptive Response Mechanism of Bacterial Infection in Triplophysa siluroides
by Yuanliang Duan, Ya Liu, Jun Ou, Feiyang Li, Xiaoyun Wu, Jianshen Lai, Jian Zhou and Mingjiang Song
Fishes 2026, 11(6), 310; https://doi.org/10.3390/fishes11060310 - 22 May 2026
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Abstract
Triplophysa siluroides, a unique species of plateau fish, holds significant economic value. However, its natural population has sharply declined due to overfishing and the construction of water conservancy projects. Investigating the various conditions necessary for its growth is a crucial prerequisite for [...] Read more.
Triplophysa siluroides, a unique species of plateau fish, holds significant economic value. However, its natural population has sharply declined due to overfishing and the construction of water conservancy projects. Investigating the various conditions necessary for its growth is a crucial prerequisite for successful artificial breeding. This study used Edwardsiella tarda as the pathogenic bacterium to determine the median lethal concentration following infection of T. siluroides, as well as to examine changes in tissues, organs, and gene expression. The study found that dead T. siluroides displayed symptoms such as abdominal distension, fluid accumulation, and a reddened anus, and the median lethal concentration of E. tarda for T. siluroides was calculated to be 1.00 × 106 CFU/mL. Following infection with E. tarda, the liver, intestine, gills, spleen, and kidneys exhibited varying degrees of lesions. Transcriptome sequencing identified a total of 54,667 genes. Compared to the blank control group, 192 genes were downregulated and 125 genes were upregulated in T. siluroides infected with E. tarda. In contrast, after infection with the poly(I:C) viral mimic, 225 genes were downregulated and 436 genes were upregulated. This study determined the median lethal concentration of E. tarda for T. siluroides via intraperitoneal injection under laboratory conditions. The results may contribute to disease prevention and control in the breeding of T. siluroides, as well as inform future risk assessments of infection in aquaculture water bodies. Full article
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