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I live in the USA and was wondering if there is a site or resource that any of you guys know of or use to determine if a particular fish is legal or illegal to possess.
I wouldn't be so sure. I've seen freshwater stingrays for sale in hole-in-the-wall stores in Houston's westside Chinatown, and I know for a fact they're illegal in Texas.
Under normal circumstances I would not refer you to a different 'fish' site but Aquatic Predators has put together a reasonably complete list of restricted fishes for most states. Of course...such a list is only as good as the last time it was updated so it is always best to check with your state's fish and wildlife department to see if anything has changed.
Here's a link to the Restricted Fishes forum of Aquatic Predators: