How does a decrease in the dissolved oxygen level affect the breathing rate of goldfish?
In this experiment, you will observe the breathing rate of goldfish as they swim in water with different levels of dissolved oxygen. [NOTE: It is recommended that you perform this experiment only if you already have access to an aquarium with four to six goldfish and only with the permission of a responsible adult. This experiment will not harm the fish as long as you limit the duration of the experiment and return the fish to the main aquarium afterwards.] To begin the experiment, use what you know about dissolved oxygen and its effect on fish to make an educated guess about how the fishes’ breathing rate will change as the level of dissolved oxygen drops. This educated guess, or…
