Hydrological and trophic characteristics of tuna habitat: consequences on tuna distribution and longline catchability

By A. Bertrand, E. Josse, P. Bach, P. Gros, L. Dagorn. 2002

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Effects of environmental variables on fish feeding ecology: implications for the performance of baited fishing gear and stock assessment (2004, background): “Additional environmental variables, especially prey density (Bertrand et al., 2002), undoubtedly affect the variation.”
Biogeography of tuna and billfish communities (2012, background): “As adults, this smaller species generally feeds in gyres (Bertrand et al., 2002) where the mixed layer is deep and where the temperature falls gradually as the water depth increases (Tomczak & Godfrey, 2003).”
Sustainable exploitation of small pelagic fish stocks challenged by environmental and ecosystem changes : a review (2005, background): “…or patchiness are certainly major influences, but environmental forcings like the thermal structure (Gammelsrød et al., 1998), turbidity of the water, and changes in current speed and velocity also play a major role, or even interact with biotic factors as suggested by Bertrand et al. (2002).”
Bigeye Tuna (Thunnus obesus) behaviour and phisiology and their relevance to stock assessments and fishery biology (2005, background): “…as likely to be a function of effective gear targeting (e.g., placing longline hooks at depths where fish are aggregated), as they are to reflect true fish abundance (Boggs 1992, Hinton and Nakano 1996, Hinton and Deriso 1998, Bigelow et al. 2002, Bertrand et al. 2002a, Bach et al. 2003).”