How do fish respond to their environment?

Answer:
It depends on the environment they are in, if they are in their own they will be fine, but if they are a saltwater fish in freshwater or vise versa they will die in a few days (excluding the bull shark which can adapt to both but I highly doubt you have one as a pet)
First answer by Perkinator16. Last edit by Perkinator16. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 2 [recommend question].