I don’t have data but can…

I don’t have data but can tell you that I have been bass fishing in Lake Erie for 30 years. I have first hand witnessed the arrival of cormorants and the decrease of small to medium fish. Back 25 years ago you could catch a stringer full of nice sized bass while releasing many smaller fish. The kids enjoyed it and it got everyone out in the beautiful natural environment. We would catch rock bass as well as black bass. Even sunfish in the quarries around Port Colborne. Introduce the cormorant (and yes I know other things have changed as well) and 10 years later we can barely catch a fish and usually only large fish at that. All of the rock bass are gone. Now try to take a young child out fishing and hold their interest. Cormorants are thriving and fish are decimated.

Cormorants should be considered vermin with an open unlimited season.