Most aquatic organisms are "cold-blooded" (or ectothermic): their body temperature (and metabolic rate) varies with the environment.
Therefore they are sensitive to temperature changes in the environment.
Oxygen levels in water decreases as temperature increases: see Table 8.1-1.
Some organisms can tolerate high temperatures and/or low oxygen levels better than others.
Note that goldfish can tolerate temperatures up to 106°F (41°C), see Table 8.1-2.
Use breathing as a measure of metabolic rate in goldfish.
Observe goldfish breathing rate - keep fish calm, look at opercula
(gill covers), not the mouth.
Establish a basal rate, then at 3 different water temperatures, 3 trials each p. 213.
DO NOT use temperatures near 40°C or 0°C: do not COOK or FREEZE the fish!
Let the water temperature return back to room temperature before returning the fish to the tank.
State your hypothesis on the effect of water temperature on breathing rate?
©Copyleft Peter Chen