Fig. 7. Plot of the rate of oxygen consumption as a function of swimming speed for a selection of heterothermic and non-heterothermic species. Heterothermic tuna are indicated by red lines, and non-heterotherms are indicated by blue lines. The colored regions indicate broad distinctions between strategic differences in design. These performance characteristics are hard to measure experimentally and should not treated as quantitative measures of performance limits. The `effective' strategies have higher aerobic swimming speeds, but consume more O<sub>2</sub> at any speed. The `efficient' strategies have lower aerobic swimming speeds, but consume less O₂ at any speed than heterothermic fish. The broken green line indicates the top aerobic speed predicted by Korsmeyer et al. (1996) based on modeled estimates of tissue O₂ delivery and consumption. Data are presented for sockeye salmon (Oncorhynchus nerka) (Brett and Glass, 1973), Atlantic mackerel (Scomber scombrus) (Lucas et al., 1993), yellowfin tuna (Thunnus albacares) (Dewar and Graham, 1994), skipjack (Katsuwonus pelamus) (Gooding et al., 1981) and Pacific albacore (Thunnus alalunga) (Graham et al., 1989).

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