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Open research questions in Marine and fisheries research

48 unresolved questions extracted from the limitations and future-work sections of 790 Marine and fisheries research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • There is little known about the relationship between three marine invertebrates that commonly co‐occur around New Zealand: blackfoot abalone ( Haliotis iris ), Cook's turban ( Cookia sulcata ) and the seven‐arm sea star ( Astrostole scabra ).

    The Distribution and Feeding Ecology of Three Marine Invertebrates in a Customary Fisheries Management Area and Implications for Restoration · 2026 · DOI

  • The monitoring and identification of ALDFG in northern Brazil are still scarce, despite the region practicing artisanal fishing as an important economic activity.

    Accumulation of Abandoned, Lost, or Discarded Fishing Gear on Beaches of the Amazon Coastal Zone · 2026 · DOI

  • This analysis does not control external drivers such as climate variability, oceanographic shifts, illegal, unreported, and unregulated (IUU) fishing, or changes in reporting protocols, all of which may influence landing trajectories independently of policy reforms. 42 © 2026 Author(s).

    Species-Specific Evidence of Structural Change in Portuguese Fisheries: A 30-Year Analysis of CFP Reform Influence · 2026 · DOI

  • The trophic ecology of the skipjack herring is poorly understood, therefore we quantified the length, mouth gape and gut contents of juvenile skipjack herring from the Mississippi River (fish n = 6), Illinois River (fish n = 181) and Ohio River (fish n = 255) and tested for changes in diets and predator–prey size ratios during ontogeny.

    Diet of juvenile skipjack herring <i>Alosa chrysochloris</i> : Ontogenetic shifts, predator–prey size ratios and mouth gape allometry · 2026 · DOI

  • While this study provides crucial baseline data on the life history parameters of A. laterna, Monochirus hispidus, and Microchirus ocellatus, several limitations should be considered when interpreting the results and for guiding future research. First, the study was conducted within a specific geographic region—the Aegean Sea coast of Türkiye—which restricts the direct extrapolation of results to other parts of the Mediterranean or adjacent seas. Geographic variation in environmental conditions and fishing pressure can lead to significant differences in the life-history traits of fish populations, as evidenced by studies such as Audzijonyte et al. (2020) and Baudron et al. (2014), which highlight the complex and often localized responses of fish to warming and exploitation. Second, the temporal scope and sampling resolution may influence the generalizability of the results. As emphasized by Hilborn et al. (2020), environmental regimes and climate change fundamentally constrain stock productivity and recruitment, introducing uncertainty into management targets and recovery timelines. Long-term Cerim et al. (2026), PeerJ, DOI 10.7717/peerj.21227 15/21 monitoring is essential to fully understand population responses to both environmental and anthropogenic drivers. Finally, sample sizes for certain species and demographic groups—such as Monochirus hispidus, with a total of 94 individuals—while adequate for initial parameter estimation, may limit the statistical power and precision required for more complex analyses. Future studies would benefit from expanded sampling, particularly for rare species or specific sex and age classes, to support more robust and detailed life-history comparisons. Despite these limitations, this study successfully establishes a critical foundation of knowledge for these previously data-poor species. The identified constraints clearly outline the path for future research, emphasizing the need for long-term, spatially expansive, and ecosystem-oriented studies.

    Some population parameters of three flatfish species ( <i>Arnoglossus laterna</i> , <i>Monochirus hispidus</i> , and <i>Microchirus ocellatus</i> ) from Güllük Bay, southern Aegean Sea · 2026 · DOI

  • The effectiveness of management actions implemented through the Fishery Ecosystem Initiative loop requires peer review and reassessment, but no standardized protocol for evaluating outcomes of harvest control rules or other HAB-related management responses in real-time has been established for application in future red tide events.

    A garden of forking paths: an ecosystem-based fisheries management case study of Florida red tides · 2026 · DOI

  • The paper notes that some ecosystem issues may have no immediate fishery management response due to insufficient information, but does not specify which knowledge gaps about red tide formation, propagation, or ecosystem effects on the West Florida Shelf are most critical to prioritize for research recommendations to overcome statutory authority limitations.

    A garden of forking paths: an ecosystem-based fisheries management case study of Florida red tides · 2026 · DOI

  • The scoping process to define species directly and indirectly affected by red tides and to set relevant temporal, spatial, and sectoral bounds is identified as necessary but not detailed; no systematic approach for conducting this ecosystem-wide scoping specific to West Florida Shelf red tide events has been developed or tested.

    A garden of forking paths: an ecosystem-based fisheries management case study of Florida red tides · 2026 · DOI

  • The paper acknowledges that defining success metrics for a red tide Fishery Ecosystem Initiative requires broad stakeholder engagement, but provides no concrete framework for operationalizing what specific ecological, economic, and social indicators should constitute success or how to measure tradeoffs between these triple bottom line sectors in the context of harmful algal bloom management.

    A garden of forking paths: an ecosystem-based fisheries management case study of Florida red tides · 2026 · DOI

  • The paper identifies that policies addressing external factors impacting fishery productivity (e.g., water quality, coastal development, nutrient loading) are underdeveloped, yet no specific mechanisms for assessing which external factors most influence red tide formation and fishery impacts on the West Florida Shelf have been proposed or tested.

    A garden of forking paths: an ecosystem-based fisheries management case study of Florida red tides · 2026 · DOI

  • The study shows seasonal effects on diversity are depth-dependent through season-depth interactions but does not investigate whether this interaction pattern differs between artificial and natural reefs, or determine threshold depth values where seasonal effects on fish community organization shift or reverse.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • Long-term monitoring of physico-chemical parameters (temperature, salinity, dissolved oxygen) and fish assemblages is recommended as necessary, but the study does not specify monitoring frequency, duration, sampling grid resolution, or multi-year datasets needed to establish baseline conditions and detect climate-driven shifts in reef fish communities.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • The research demonstrates that artificial reef efficacy depends on environmental fluctuation and recommends depth-specific design, but lacks empirical guidelines specifying optimal depth ranges, structural configurations, or environmental stability thresholds needed to maximize fish diversity in artificial reefs deployed in the Sea of Oman.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • While the study identifies competition for food and space between fish species as a driver of seasonal diversity changes, it does not provide empirical data on resource availability (prey abundance, spatial heterogeneity) or directly measure interspecific competition intensity across winter-summer transitions in the Suhar artificial reef system.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • Vertical mixing variation between summer and winter seasons causes opposite dissolved oxygen-depth relationships, but the study does not investigate the specific mechanisms or threshold values of vertical mixing intensity that drive seasonal transitions in oxygen distribution patterns at different reef depths.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • The study acknowledges that diver-operated video methods can cause fish disturbance and affect abundance measurements, but does not quantify the magnitude of this observer effect or establish standardized protocols to minimize it across different depth zones in artificial versus natural reefs of the Sea of Oman.

    Seasonal variability of physico-chemical parameters and their effects on fish diversity in artificial reefs of the Sea of Oman · 2026 · DOI

  • Dahle et al. (2018) genetic sampling excluded NEAC individuals and could not guarantee that collected individuals during spawning season were actually spawning due to high mobility of adult cod.

    The pervasiveness of fish spawning along a complex coastline · 2026 · DOI

  • The use of 10 m depth as a general threshold for egg location may not capture the actual varying depths (typically 2–5 m) where eggs remain associated with the pycnocline.

    The pervasiveness of fish spawning along a complex coastline · 2026 · DOI

  • Five years post-spill, it was reported that 48 of the Gulf's endemic fish species had not been collected and, with expanded methods, we now report that 29 (of the 78 endemic species) have not been reported in collections since 2010 (five of these are only known from observations post-spill).

    Ten years later: An update on the status of collections of endemic Gulf of Mexico fishes put at risk by the 2010 Oil Spill · 2024 · DOI

  • For these species to continue contributing to food security and livelihoods while retaining their ecosystem function, a truly precautionary approach is essential to reduce the risk of declines, particularly in the case of small-scale commercial fisheries of low-productivity species and where management and monitoring are lacking.

    Mainstreaming Fish Spawning Aggregations into Fishery Management Calls for a Precautionary Approach · 2016 · DOI

  • It is unrealistic to expect fishers' LEK and understanding of ecology to embody such attributes, since stomach contents of commercially important target species are rarely examined, and fishers interact with ecosystems primarily to earn a living.

    What is “Ecological” in Local Ecological Knowledge? Lessons from Canada and Vietnam · 2011 · DOI

  • However, despite this concerted scientific effort, the MP was not implemented because, shortly after its adoption, it became evident that historical catches may have been substantially underreported.

    Developing a management procedure robust to uncertainty for southern bluefin tuna: a somewhat frustrating struggle to bridge the gap between ideals and reality · 2010 · DOI

  • Abstract Subarctic marine ecosystems are highly sensitive to current climate and sea-ice change but long-term evidence for food web shifts is lacking.

    Past subarctic marine food web shifts recovered by sedaDNA and network analysis · 2026 · DOI

  • While passive benthic trap catches tracked metabolic activity (peaking in warm summer months), light trap efficiency peaked in spring and collapsed during summer, confirming that sampling efficiency was strictly limited by the short duration of the night.

    Optimizing Light Traps for Littoral Mysids and Mesopredatory Fish in the Baltic Sea: Environmental Drivers and Seasonal Monitoring Efficacy · 2026 · DOI

  • Due to the abnormal cloudiness (66%), which created a “screen effect”, the influx of solar radiation was insufficient to destroy the ice.

    Analysis of the impact of hydrometeorological and ice conditions on the efficiency of the Antarctic toothfish (Dissostichus mawsoni Norman, 1937) fishery in the Ross Sea · 2026 · DOI

Most-cited papers in Marine and fisheries research

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48 open questions have been extracted from the limitations and future-work passages of 790 Marine and fisheries research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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