Question

The danger posed to fish in an aquarium by an overpopulation of bacteria caused by an algal bloom is most likely a

A. Decrease in water temperature.


B. Reduction in oxygen levels.


C. Decrease in food supply.


D. Removal of minerals

Answer 1

B. Reduction in oxygen levels. An algal bloom can cause an overpopulation of bacteria, which in turn can consume a lot of oxygen in the water. This can lead to low oxygen levels, which can be dangerous for fish and other aquatic life. Algal blooms can also lead to the production of toxins that can harm the fish and other inhabitants of the aquarium.