Open research questions in Fish Ecology and Management Studies

What the literature leaves open

• Although fish become less vulnerable to angling following capture experience, the behavioural changes underlying this reduced vulnerability remain poorly understood.

  Risky bait: capture experience alters feeding mode toward angling gear in red sea bream · 2026 · DOI

• Flood-control pumpstations compromise connectivity and survival for migratory fish globally, yet field evaluations of modern "fish-friendly" designs remain scarce.

  Passage through submersible and Archimedes pumps results in decreased migration survival in coho salmon yearlings · 2026 · DOI

• The spatial scale at which water quality and fish assemblages respond to land use is not well understood. There is a need to examine the effects of riparian and watershed land use on water quality and fish assemblages at multiple spatial scales.

  Scale-Dependent Effects of Riparian and Watershed Land Use on Water Quality and Fish Assemblages: Implications for Reservoir Ecosystem Management · 2026 · DOI

• Lipid metabolism plays a central role in supporting migration and reproduction, yet sex-specific biochemical adaptations in invasive White Sea populations remain insufficiently studied.

  Lipid profile and fatty acid composition of pink salmon, Oncorhynchus gorbuscha Walbaum, 1792 (Salmoniformes, Salmonidae), during spawning migration in the Indyora River (White Sea basin) · 2026 · DOI

• Abstract Reservoir cascades in large river systems impose directional pathways that can structure biological invasions, yet how these pathways interact with propagule supply and lock-mediated passage opportunity to influence arrival timing remains poorly understood.

  Reservoir cascades as directional invasion corridors · 2026 · DOI

• However, the main drivers of the productivity in the Amazon plume are still poorly understood.

  On the Importance of Riverine Organic Matter for the Amazon Plume: A Modeling Study · 2025 · DOI

• Understanding spatiotemporal patterns of fish density and their environmental drivers is critical for managing river–lake ecosystems, yet dynamic interactions in heterogeneous habitats remain poorly quantified.

  Spatiotemporal Dynamics of Fish Density in a Deep-Water Reservoir: Hydroacoustic Assessment of Aggregation Patterns and Key Drivers · 2025 · DOI

• However, the demographic histories of ecologically-linked co-diversifying lineages remain understudied.

  Origin of the Laurentian Great Lakes fish fauna through upward adaptive radiation cascade prior to the Last Glacial Maximum · 2024 · DOI

• Conclusions Overall, we highlight the magnitude of variation in water chemistry used within zebrafish research and provide some empirical evidence to show that not all of these water conditions might be optimal for developing zebrafish and reproducibility of research, although further research is necessary to determine longer-term effects of water chemistry on older larvae, juveniles and adults.

  A survey of water chemistry used in zebrafish facilities and their effects on early zebrafish development · 2024 · DOI

• The difficulty of morphological species assignation due to intra- and interpopulation phenotypic diversity. The challenge of identifying Phoxinus species using short 12S mt fragments. The need to assess the biodiversity of Phoxinus minnows in Austria.

  Data collected in a citizen scientist study uncover a new species record of Phoxinus minnow for Austria · 2026 · DOI

• Further studies are needed to assess the biodiversity of Phoxinus minnows in other regions. The use of DNA barcoding and metabarcoding can be applied to other freshwater ecosystems to assess biodiversity. Studies on the ecological and conservation implications of the complex species distributions and hybridization zones are needed.

  Data collected in a citizen scientist study uncover a new species record of Phoxinus minnow for Austria · 2026 · DOI

• The study only considered occurrences with a large uncertainty interval using temporal smoothing. The paleoclimate model outputs had a limited spatial resolution of 0.25°.

  An assessment of European and Atlantic sturgeons’ paleoniches during the Holocene · 2026 · DOI

• There is a lack of understanding of the paleoniches of European and Atlantic sturgeons. The study aims to fill this gap by assessing the paleoniches of the two species during the Holocene.

  An assessment of European and Atlantic sturgeons’ paleoniches during the Holocene · 2026 · DOI

• Invasive species disrupt natural River Continuum Concept predictions. Habitat alteration affects the ecological balance of the river continuum. Conservation efforts are hindered by a lack of understanding of the ecosystem.

  Ecological survey of the endangered Dawkinsia arulius (Arulius Barb) and Barbodes montanoi (Paitan Barb) in the Banawang River Continuum, Philippines · 2026 · DOI

• The status of freshwater biodiversity in the Philippines is currently defined by a critical absence of a centralized national inventory. There is a lack of understanding of the ecological integrity of the Banawang River Continuum.

  Ecological survey of the endangered Dawkinsia arulius (Arulius Barb) and Barbodes montanoi (Paitan Barb) in the Banawang River Continuum, Philippines · 2026 · DOI

• The efficacy of artificial stocking in enhancing existing wild S. trutta stocks is limited. Artificially reared fish may face challenges in adapting to natural environments.

  Artificially Reared Salmo trutta Fry in a Natural Environment: Growth and Fitness Compared to Wild Specimens · 2026 · DOI

• The study identifies a gap in the quantification and prediction of non-native freshwater fish impacts in peninsular Florida. The study addresses the need for a tailored framework for assessing non-native fish impacts in the region.

  Quantifying and predicting impacts of nonnative freshwater fishes in peninsular Florida, USA · 2026 · DOI

• Limited information on the species' habitat needs. Difficulty in studying the species due to its narrow range and limited population size. Complexity of modeling species distribution and microhabitat use.

  Habitat use of the Etowah bridled darter, a locally endemic fish species · 2026 · DOI

• The study is limited to the Upper Etowah River, Amicalola Creek, and Longswamp Creek. The study only observed 236 individual P. freemanorum. The study did not examine other factors that may influence the species' distribution.

  Habitat use of the Etowah bridled darter, a locally endemic fish species · 2026 · DOI

• Lack of appropriate practices and requirements for the execution of measures. Absence of proper project documentation for detailed design. Disruption of river continuity can lead to significant adverse impacts on river ecosystems.

  A comprehensive approach to prioritizing the removal of artificial barriers to restore river continuity in the Prut and Siret River basins, Ukraine · 2026 · DOI

• There is a lack of appropriate practices and requirements for the execution of measures to restore river continuity. There is a need for a comprehensive approach to identifying and prioritizing artificial barriers for removal.

  A comprehensive approach to prioritizing the removal of artificial barriers to restore river continuity in the Prut and Siret River basins, Ukraine · 2026 · DOI

• There is a gap in understanding the factors that influence the movement of Rocky Mountain sculpin. The study aims to fill this gap by analyzing the movement patterns of Rocky Mountain sculpin.

  Biotic and abiotic factors and their interaction influence the seasonal movement patterns of a dispersal limited benthic species · 2026 · DOI

• There is a lack of comprehensive datasets on coregonine spawning and nursery areas. Historical information related to freshwater species, especially fishes, is scattered and underutilized. The CORHIST database aims to address this gap.

  Two hundred years of historical spawning and nursery data for coregonine fishes in the Laurentian Great Lakes · 2026 · DOI

• The study only investigated the behavior of S. salar and S. trutta post-smolts in one marine protected area. The sample size was limited, with 74 (2023) and 25 (2024) for S. salar, and 71 (2023) and 39 (2024) for S. trutta. The study did not investigate the long-term effects of the marine protected area on the populations.

  Migratory behavior and habitat use of Atlantic salmon Salmo salar and sea trout S. trutta smolts in relation to a marine protected area · 2026 · DOI

• There is a lack of understanding of the migratory behavior and habitat use of Atlantic salmon and sea trout smolts in relation to marine protected areas. The effectiveness of marine protected areas in conserving the populations is debated.

  Migratory behavior and habitat use of Atlantic salmon Salmo salar and sea trout S. trutta smolts in relation to a marine protected area · 2026 · DOI

Most-cited papers in Fish Ecology and Management Studies

• Rapid worldwide depletion of predatory fish communities · Nature · 2003 · 2,070 citations
• Cascading Trophic Interactions and Lake Productivity · BioScience · 1985 · 1,880 citations
• Freshwater Ecoregions of the World: A New Map of Biogeographic Units for Freshwater Biodiversity Conservation · BioScience · 2008 · 1,645 citations
• Landscapes to Riverscapes: Bridging the Gap between Research and Conservation of Stream Fishes · BioScience · 2002 · 1,238 citations
• Bending the Curve of Global Freshwater Biodiversity Loss: An Emergency Recovery Plan · BioScience · 2020 · 1,064 citations
• Biodiversity Conservation in Running Waters · BioScience · 1993 · 706 citations
• Alteration of North American Streams by Beaver · BioScience · 1988 · 695 citations
• Stream Fish Ecology: A Landscape Perspective · BioScience · 1991 · 616 citations
• Implications of Dam Obstruction for Global Freshwater Fish Diversity · BioScience · 2012 · 571 citations
• Need for Ecosystem Management of Large Rivers and Their Floodplains · BioScience · 1995 · 476 citations

Most recent work

• Fishing ban halts seven decades of biodiversity decline in the Yangtze River · Science · 2026
• Environmental Drivers of Fish Taxonomic Distinctness and Functional Diversity in a Tropical River Basin · Ecohydrology · 2026
• Range‐wide life history diversity and climate exposure in adult Chinook salmon · Ecosphere · 2026
• To Initiate or to Terminate: Effects of Endurance Status and Hydraulic Factors on Fish Upstream Attempt Behavior Under High-Flow Conditions · Fishes · 2026
• Lower Abundance of Young‐of‐the‐Year Fish in Alpine Rivers Affected by Hydropeaking: An Austrian Field Study · Ecohydrology · 2026
• Building hydrology-food web model to assess environmental flows for indigenous fish in the upper Yangtze mainstem · Ecological Modelling · 2026
• Inland recreational fisheries harvest far exceeds reported inland harvest in the United States · Fisheries · 2026
• Two hundred years of historical spawning and nursery data for coregonine fishes in the Laurentian Great Lakes · Scientific Data · 2026
• Environmental Flows Should Be Climate-Adapted and Can Reduce Downstream Impacts of River Flow Modification · Estuaries and Coasts · 2026
• AMOC response to historical freshwater increase · Nature Geoscience · 2026

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