Houses have been built around a small retention pong, increasing the fertilizer runoff into the pond. This has led to algal blooms in the pond that periodically reduce the amount of dissolved oxygen available in the water What will be the most likely Long-Term effect on the fish population living in the pond if the situation with the fertilizer does not change?

Question

anonymous · Answer

The Fish population will grow as more offspring are born that can take advantage of the new conditions.
The fish population will lean to survive with less oxygen and more algae in the water.
The population will evolve, leaving only those genetically equipped to deal with low oxygen levels. 
The population will be replaced by a different species of the fish that consumes algae for food.