Hydrobiology nursery post. Restoring river ecosystem to boost aquatic farming

Beavers don't eat fish, but it doesn't mean it can't be used.
I suggesting adding a new building that will breed and release fish (maybe other primitive water creatures) into water bodies.
As more fishes are released the wider building range spreads over flooded area.
In affected zone aquatic plants get a growing boost instead of beehive.

Fish will die if area gets smaller or water body dries up completely and have to be bred again.

When hydrobilogist is not occupied raising fish population (when it reached maximum for given range \ water body area) it slowly produces science points instead.