Correlations Between Environment, Physiology, and Activity and the Effects on Thermoregulation in Skipjack Tuna

Dizon, Andrew E.; Brill, Richard W.; Yuen, Heeny S. H.

doi:10.1016/b978-0-12-639180-0.50022-7

Cited by 26 publications

(20 citation statements)

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“…Using this approach, Dizon et al (1978) and Dizon & Brill(1979b) showed that both species exhibited changes in C, implying that both had the ability to physiologically thermoregulate, presumably by somehow changing the efficacy of their thermoconserving mechanisms or permitting expansion of their isothermal core (see equation (2) …”

Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

“…In brief, Sharp & Vlymen's (1978) model, which was also used by Dizon et al (1978) predicted that heat production would increase in proportion to the cube of swimming speed and surface heat loss only as the square root of swimming speed. The model therefore projected that absurdly high (> 80" C above ambient) muscle temperatures would be required at sustainable swimming speeds to dissipate metabolic heat production if vascular heat exchanger efficiency could not be reduced.…”

Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

“…Use of steady state temperature measurements to determine thermoregulatory abilities of tunas Dizon et al (1978) and Dizon & Brill(1979a, b) subsequently used muscle temperature telemetry techniques, under controlled laboratory conditions, to quantify the physiological thermoregulatory abilities of swimming skipjack and yellowfin tunas. [The unacceptability of using muscle temperatures of freshly landed fish at sea to determine the thermoregulatory abilities of tunas has been thoroughly discussed by Dizon & Brill(1979a, b) and will not be repeated here.]…”

Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

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Basic concepts relevant to heat transfer in fishes, and their use in measuring the physiological thermoregulatory abilities of tunas

1994

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SynopsisAerobic heat production and heat loss via the gills are inexorably linked in all water breathing teleosts except tunas. These processes are decoupled in tunas by the presence of vascular counter-current heat exchangers, and sustained (i.e., steady state) muscle temperatures may exceed water temperature by 10" C or more in larger individuals. The presence of vascular counter-current heat exchangers is not clearly advantageous in all situations, however. Mathematical models predict that tunas could overheat during strenuous activity unless the efficacy of vascular heat exchangers can be reduced, and that they may be activity limited in warmer waters. Tunas may likewise be forced out of potentially usable habitats as they grow because they have to occupy cooler waters. Vascular counter-current heat exchangers also slow rates of heating and cooling. A reduced rate of muscle temperature decrease is clearly advantageous when diving into colder water to chase prey or avoid predators. A reduced rate of heat gain from the environment would be disadvantageous, however, when fish return to the warmer surface waters. When subjected to changes in ambient temperature, tunas cannot defend a specific body temperature and do not thermoregulate in the mammalian sense. Yet when appropriately analyzed, data taken under steady state and non-steady state conditions indicate that tunas are not strictly prisoners of their own thermoconserving mechanisms. They apparently can modify overall efficiency of their vascular counter-current heat exchangers and thus avoid overheating during bouts of strenuous activity, retard cooling after diving into colder water, and rapidly warm their muscles after voluntarily entering warmer water. The exact physiological mechanisms employed remain to be elucidated.

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Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

Section: Dq/dt = H * a (T -T)mentioning

confidence: 99%

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Basic concepts relevant to heat transfer in fishes, and their use in measuring the physiological thermoregulatory abilities of tunas

1994

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“…However, skipjack tuna white muscle appears to be only slightly more temperature sensitive than white muscle of other teleosts. The maximum sustainable 1-2" C temperature difference between skipjack tuna white muscle temperature and water temperature (Dizon et al 1978) is unlikely to have a significant effect on the maximum swimming speed of this species. Summary 1.…”

Section: Accuracy Of Predicted Maximum Swimming Speedsmentioning

confidence: 99%

Effect of temperature on isotonic twitch of white muscle and predicted maximum swimming speeds of skipjack tuna, Katsuwonus pelamis

Brill

Dizon

1979

Environ Biol Fish

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SynopsisLatent period, rise time, contraction time, and half relaxation time from isotonic contractions of isolated white muscle samples from skipjack tuna, Katsuwonus pelamis, were determined at 20°, 27", and 34" C. These parameters were found to be inversely proportional to temperature (Q,, = 1.47, 1.67, 1.62, and 1.72, respectively). The data show that contraction time and the effect of temperature on contraction time of skipjack tuna white muscle are not unique when compared to other equal-sized teleosts. Based on contraction time, maximum swimming speeds at each muscle temperature were calculated and found not significantly to exceed the maximum speeds of other equal-sized teleosts, when comparisons are made at the same white muscle temperatures.

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“…Bluefins have the highest metabolic rates of any fish species (Brill and Bushnell 1991). They also have the highest digestion rates and haemoglobin levels (Bushnell and Jones 1994), with the respiratory capabilities of mammals (Dizon et al 1978). They are unique among teleosts as having the most evolved endothermy, also approaching that of mammals (Stevens and Neill 1978), within the muscle viscera and brain.…”

Section: Introductionmentioning

confidence: 98%

Inter-annual and intra-annual variability in blood variables and parasitic loads of wild Thunnus maccoyii

Kirchhoff

Nelligan

Ellis³

et al. 2014

Can. J. Fish. Aquat. Sci.

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The health of southern bluefin tuna (SBT), Thunnus maccoyii, in the Great Australian Bight was assessed. Samples were obtained over 3 years (2010)(2011)(2012) and over five individual schools in 2012. Several blood variables and parasite loads were measured and used as indicators of SBT health. The health of wild SBT varied among years and among schools sampled within the same month. Haemoglobin and the humoral immune parameters lysozyme and alternative complement activity explained the majority of the variation. Haemoglobin concentration, lysozyme activity, alternative complement activity, and lactate were lower in wild SBT sampled in 2010 than in 2011 and 2012. The extent to which the health differences in wild SBT may affect ranched SBT is currently unknown. Benchmark values were set for various blood parameters and parasite loads in wild SBT. Résumé: La santé du thon rouge du Sud (TRS), Thunnus maccoyii, dans la grande baie australienne a été évaluée. Des échantillons ont été obtenus sur 3 ans (2010-2012), ainsi que de cinq bancs différents en 2012. Plusieurs variables du sang et des charges de parasites ont été mesurées et utilisées comme indicateurs de la santé du TRS. La santé des TRS sauvages variait selon l'année et, durant un mois donné, selon le banc échantillonné. L'hémoglobine et les paramètres associés à l'immunité humorale, ainsi que l'activité du lysozyme et l'activité de la voie alterne expliquaient la majeure partie des variations. La concentration d'hémoglobine, l'activité du lysozyme, l'activité de la voie alterne et le lactate étaient plus faibles chez les TRS sauvages échantillonnés en 2010 que chez ceux échantillonnés en 2011 et 2012. L'ampleur de l'incidence sur les TRS d'élevage des différences relatives à la santé observées chez les TRS sauvages demeure inconnue. Des valeurs de référence ont été établies pour divers paramètres sanguins et charges de parasites chez les TRS sauvages. [Traduit par la Rédaction]

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Correlations Between Environment, Physiology, and Activity and the Effects on Thermoregulation in Skipjack Tuna

Cited by 26 publications

References 0 publications

Basic concepts relevant to heat transfer in fishes, and their use in measuring the physiological thermoregulatory abilities of tunas

Basic concepts relevant to heat transfer in fishes, and their use in measuring the physiological thermoregulatory abilities of tunas

Effect of temperature on isotonic twitch of white muscle and predicted maximum swimming speeds of skipjack tuna, Katsuwonus pelamis

Inter-annual and intra-annual variability in blood variables and parasitic loads of wild Thunnus maccoyii

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