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      A review of temperature and oxygen tolerance studies of tunas pertinent to fisheries oceanography, movement models and stock assessments

      Fisheries Oceanography
      Wiley-Blackwell

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          Minimal Dissolved Oxygen Requirements of Aquatic Life with Emphasis on Canadian Species: a Review

          John Davis (1975)
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            Physiological and behavioural thermoregulation in bigeye tuna (Thunnus obesus).

            Tuna are unique among teleost fishes in being thermoconserving. Vascular counter-current heat exchangers maintain body temperatures above ambient water temperature, thereby improving locomotor muscle efficiency, especially at burst speeds and when pursuing prey below the thermocline. Because tuna also occasionally swim rapidly in warm surface waters, it has been hypothesized that tuna thermoregulate to accommodate changing activity levels or ambient temperatures. But previous field experiments have been unable to demonstrate definitively short-latency, mammalian-type physiological thermoregulation. Here we show using telemetered data that free-ranging bigeye tuna (Thunnus obesus) can rapidly alter whole-body thermal conductivity by two orders of magnitude. The heat exchangers are disengaged to allow rapid warming as the tuna ascend from cold water into warmer surface waters, and are reactivated to conserve heat when they return into the depths. Combining physiological and behavioural thermoregulation expands the foraging space of bigeye tuna into otherwise prohibitively cold, deep water.
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              Evolution of endothermy in fish: mapping physiological traits on a molecular phylogeny.

              Mackerels, tunas, and billfishes (suborder Scombroidei and Teleostei) provide an ideal taxonomic context in which to examine the evolution of endothermy. Multiple origins and diverse strategies for endothermy exist among these fish. Here a molecular phylogeny of the Scombroidei has been determined by direct sequencing of a portion of the mitochondrial cytochrome b gene. The distribution of endothermic species within this proposed genealogy indicates that the ability to warm the brain and retina arose independently in three lineages, each time in association with a movement into colder water. This suggests that the evolution of cranial endothermy in fish was selected in order to permit thermal niche expansion and not selected for increased aerobic capacity.
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                Author and article information

                Journal
                Fisheries Oceanography
                Fisheries Oceanogr
                Wiley-Blackwell
                1054-6006
                1365-2419
                September 1994
                September 1994
                : 3
                : 3
                : 204-216
                Article
                10.1111/j.1365-2419.1994.tb00098.x
                f5c54a17-4ec7-44ab-977a-4a9b9b79e50a
                © 1994

                http://doi.wiley.com/10.1002/tdm_license_1.1

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