Remove a dam and bend the curve for fish

Nothing bends the curve quite like removing a dam.

After dam removal on the Penobscot dam in America, populations of several migratory fish species using the river began to increase, including river herring, which catapulted from a few thousand before dam removal to well over two million fish after, surging up the main channel and filling tributaries such as in the photo above. 

More about the effects of a dam removal in this news article in the forbes

https://www.forbes.com/sites/jeffopperman/2019/07/16/remove-a-dam-and-bend-the-curve-for-fish/#58f02c224b68