From what I understand, and I wasn't part of any of those discussions with Mr. Burns, he was contracted to catch fish for another research program we had; it wasn't part of the overall survey program. From what I can see, it happened that he caught a lot of fish. I cannot comment on whether he was told he would never be hired again because he had caught fish.
I don't think there's a deliberate effort from our scientists to pick people who don't want to catch fish, especially when they know there are benefits for the fishery.