Oceanographic Influences on Tuna Fisheries Dynamics

Tuna species occupy vast pelagic realms where oceanographic processes govern their distribution, abundance and migratory pathways. Key physical drivers include sea surface temperature gradients, ocean currents, mesoscale eddies and frontal systems, each shaping habitat suitability and prey aggregation. Nutrient‐rich upwelling zones and regions of enhanced primary productivity generate feeding hotspots, leading to higher local tuna densities and affecting catch rates. Variability on seasonal to decadal timescales—such as shifts in the Pacific Decadal Oscillation or Indian Ocean Dipole—influences water mass properties, fish physiology and spawning success. Understanding how these dynamic features modulate catchability and gear selectivity is essential for robust stock assessments, adaptive harvest control rules and climate‐resilient management. Integrating satellite remote sensing, biologging data and advanced statistical models has advanced predictive capacity, revealing fine‐scale habitat preferences and informing spatial management measures such as dynamic closures and effort redistribution. This synergy between oceanography and fisheries science underpins sustainable exploitation of tuna stocks in a warming ocean.

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Oceanographic Influences on Tuna Fisheries Dynamics publication trend

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Technical terms

Sea surface temperature (SST): Measurement of the temperature at the ocean’s surface, influencing metabolic rates and spatial distribution of tuna.

Chlorophyll-a concentration: Proxy for phytoplankton biomass, indicating regions of high primary productivity that support prey species.

Sea surface height anomaly (SSHA): Deviation of the ocean surface from its mean level, used to detect mesoscale features such as eddies and currents.

Upwelling: Vertical movement of cold, nutrient-rich deep water to the surface, enhancing local productivity and attracting pelagic predators.

Catchability coefficient: Proportion of a fish population captured per unit of fishing effort, modulated by environmental conditions and gear type.

References

1. Dynamic human, oceanographic, and ecological factors mediate transboundary fishery overlap across the Pacific high seas. Fish and Fisheries (2023).
2. Using Remote-Sensing Environmental and Fishery Data to Map Potential Yellowfin Tuna Habitats in the Tropical Pacific Ocean. Remote Sensing (2017).