Make fish meal

 

It's probably not a problem exclusive to Minnesota, but the keepers of Minnesota lakes are reporting a problem with goldfish.  

As the article explains, people don't want to keep the goldfish, but they don't want to kill the goldfish.  So they let the cute little goldfish go into the local lake or stream.

The problem is, they don't stay cute and little out in the wild.

Life finds a way.

People dumped their pets into lakes, officials say. Now football-size goldfish are taking over.

So, I'd say, harvest them, then grind them up into fish meal and feed fish on fish farms.  The farmed fish will taste better.