Thermoregulation

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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?

Greater power output Signup and view all the answers

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

Neutral Signup and view all the answers

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

Counter-current exchange Signup and view all the answers

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

Contractile muscle tissue Signup and view all the answers

Which fish family is not associated with regional endothermy?

Cyprinidae (carps & minnows) Signup and view all the answers

What is the ecological advantage of regional endothermy in fish?

Niche expansion Signup and view all the answers

Which physiological trait is associated with fish exhibiting regional endothermy?

Higher activities for oxidative enzymes Signup and view all the answers

What type of fish are ectothermic poikilotherms?

Most fishes Signup and view all the answers

What is the heat conductivity ratio between water and air?

1:25 Signup and view all the answers

What is the heat capacity ratio between water and air?

1:3000 Signup and view all the answers

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

High body surface area in contact with water Signup and view all the answers

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

Poikilothermy Signup and view all the answers

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

Homeothermy Signup and view all the answers

Which group has body temperature determined primarily by the environment?

Ectothermy Signup and view all the answers

What does 'Regional endothermy' involve?

Internal generation of heat in specific body regions Signup and view all the answers

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

Temperature selection for energy conservation and greater metabolic efficiency Signup and view all the answers

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

5-13°C Signup and view all the answers

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

15°C Signup and view all the answers

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

300% Signup and view all the answers