the blue shiner is an endangered fish in georgia. it lives in the coosawattee river. a dam is built on the river to create a reservoir. the water below the dam decreases.

what would most likely happen to the blue shiner numbers after the dam is built on the river?
a) they would decrease because of new predator fish.
b) they would increase because they will have more space to lay eggs.
c) they would decrease because the dam would change the environment.
d) they would increase because there would be more nutrients in the water.