From working at a pretty responsible LFS, I've formed a lot of opinions about this particular topic. There are some fish available that I think people should be required to have a permit to purchase, mostly because out of ignorance some of them end up in natural waterways when they grow to an unmanagable size. I've run into lots of customers that actually think that's okay.
My LFS is also the only one in the area that accepts unwanted fish. It's difficult for us when we receive things like irridescent sharks, redtail catfish, gars, etc. because the chances of us actually finding decent homes for these fish is very, very slim. We can ship some of them to one of our distributors that has more success placing large species than we do, but unfortunately we end up destroying some of them, most of the time because they've been so horribly neglected by the time they come to us.
My LFS is also the only one in the area that accepts unwanted fish. It's difficult for us when we receive things like irridescent sharks, redtail catfish, gars, etc. because the chances of us actually finding decent homes for these fish is very, very slim. We can ship some of them to one of our distributors that has more success placing large species than we do, but unfortunately we end up destroying some of them, most of the time because they've been so horribly neglected by the time they come to us.