Go (Gold)fish

Minnesota Zoo feeding animals unwanted pet goldfish dumped in a local lake

Maybe I'm being optimistic about this, but here's a hopeful take: maybe people will be less likely to abandon their pet fish in the wild if they know that this might be the outcome.  It's one thing to release ol' goldy in the pond, thinking that he'll have a long, happy life in the wild (where he is an invasive species).  It's a different matter entirely to do so knowing that there's a decent chance that he'll end up as grizzly bear chow at the zoo...

Of course, that leaves being flushed down the toilet as an option, so maybe the real message here should be, don't get a pet goldfish unless you're sure that you can care for it...