Opportunistic predation in tuna: a size-based approach

By Frederic Menard, C. Labrune, Yunne-Jai Shin, Ah-Soy Asine, F. Bard. 2006

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Isotopic evidence of distinct feeding ecologies and movement patterns in two migratory predators (yellowfin tuna and swordfish) of the western Indian Ocean (2007, background): “…369 adult and juvenile yellowfin tuna spend the vast majority of their time in the surface layer and 370 prey on small organisms (Brill et al. 2005; Ménard et al. 2006; Potier et al. 2007).371 Consequently, swordfish have access to a larger size range of prey in the environment than 372 yellowfin…”
Decadal diet shift in yellowfin tuna Thunnus albacares suggests broad-scale food web changes in the eastern tropical Pacific Ocean (2014, background): “Fisheries-independent trawl surveys are expensive and pelagic trawls are often biased against larger, active micronekton (Young et al. 2001, Bertrand et al. 2002, Ménard et al. 2006).”
Food-web inferences of stable isotope spatial patterns in copepods and yellowfin tuna in the pelagic eastern Pacific Ocean (2010, background): “Marked trophic ontogeny is not characteristic of yellowfin tuna in general (King and Ikehara, 1956; Alverson, 1963; Olson and Boggs, 1986; Buckley and Miller, 1994; Ménard et al., 2006), except for very small individuals (Maldeniya, 1996).”
Feeding ecology and niche segregation in oceanic top predators off eastern Australia (2010, methodology): “Our study agreed with Ménard et al. (2006) indicating that the median prey size for yellowfin tuna is smaller than that for bigeye tuna.”