Thermoregulation
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Questions and Answers

Which fish family is known for regional endothermy?

  • Scombridae (mackerels & tunas) (correct)
  • Cyprinidae (carps & minnows)
  • Gadidae (cods & haddocks)
  • Clupeidae (herrings & sardines)
  • What is the function of the 'rete mirabile' in fish?

  • Regulate blood pH
  • Minimize O2 loss to venous capillaries (correct)
  • Maximize CO2 loss to venous capillaries
  • Enhance oxygen absorption in the gills
  • Which fish is known for having a heater organ in its cranium?

  • Barracuda
  • Swordfish (correct)
  • Catfish
  • Salmon
  • What is the advantage of heterothermy in the swimming musculature of certain fish?

    <p>Greater power output</p> Signup and view all the answers

    Which type of buoyancy is established and maintained by some fish species?

    <p>Neutral</p> Signup and view all the answers

    What is the main function of the gas bladder in fish?

    <p>Counter-current exchange</p> Signup and view all the answers

    What is the primary source of heat production for the heater organ in swordfish?

    <p>Contractile muscle tissue</p> Signup and view all the answers

    Which fish family is not associated with regional endothermy?

    <p>Cyprinidae (carps &amp; minnows)</p> Signup and view all the answers

    What is the ecological advantage of regional endothermy in fish?

    <p>Niche expansion</p> Signup and view all the answers

    Which physiological trait is associated with fish exhibiting regional endothermy?

    <p>Higher activities for oxidative enzymes</p> Signup and view all the answers

    What type of fish are ectothermic poikilotherms?

    <p>Most fishes</p> Signup and view all the answers

    What is the heat conductivity ratio between water and air?

    <p>1:25</p> Signup and view all the answers

    What is the heat capacity ratio between water and air?

    <p>1:3000</p> Signup and view all the answers

    What is the main factor contributing to high rates of convective heat loss in water for fishes?

    <p>High body surface area in contact with water</p> Signup and view all the answers

    Which term refers to the variation of body temperature with the environment?

    <p>Poikilothermy</p> Signup and view all the answers

    What is the term for the maintenance of constant body temperature?

    <p>Homeothermy</p> Signup and view all the answers

    Which group has body temperature determined primarily by the environment?

    <p>Ectothermy</p> Signup and view all the answers

    What does 'Regional endothermy' involve?

    <p>Internal generation of heat in specific body regions</p> Signup and view all the answers

    What is an example of behavioral thermoregulation mentioned in the text?

    <p>Temperature selection for energy conservation and greater metabolic efficiency</p> Signup and view all the answers

    What is the preferred temperature range for energy conservation in Sculpin (Cottus extensus)?

    <p>5-13°C</p> Signup and view all the answers

    At what temperature do Sockeye Salmon (O. kisutch) digest after dusk?

    <p>15°C</p> Signup and view all the answers

    What percentage increase in growth rate is observed in Sculpin due to increased digestion efficiency?

    <p>300%</p> Signup and view all the answers

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