For azeritis and laudluvr:
No where in my post did I state that Public Aquariums would not be interested in "any" fish donations, or "any" sharks for that matter. I was referring to nurse sharks, and nurse sharks alone.
I have personally spoken to a few public aquariums about this very thing. It is my opinion (and that of the rep's I spoke to at the aquariums) that accepting a large and "very" common nurse shark, is quite different than accepting angel fish, snappers, Red Devils, etc... The point azeritis brought up about fish already used to captivity is a good one, and I was told the same. Furthermore, I believe there are situations where a public aquarium is offered a rare, or show size specimen (fish) from a private party, and are very happy to accept. Nurse sharks are a bit different.
IMO nurse sharks are all to often collected, and then sold to parties which do not realize their growth potential. How many times have you heard this very topic come up? "Need home for overgrown nurse shark!" I've heard it plenty.
Sure there are certain sharks which public aquariums may be interested. I learned this when speaking to them about my black tip.
laudluvr: How many people do I know that have sharks to donate? A few actually. Myself included.