Rerouting a river could affect fishing in the river downstream because

the temperature of the water would change

people would have to drive too far to fish

the river would have less water, so there would be less fish to catch

the river would no longer have fresh water

Verified Answer :

Neuron

There are many possibilities how rerouting a river could affect fishing in a river. However, from the answers you've provided, less water being available because of the rerouting of a river is likely the most correct answer - rerouting means less water which in effect means less fish to be found.