This could be a stupid question, but if you put a bear in front of a fish tank, the kind they have in lobbies and restaurants, would it know they’re fish? This might be an obvious yes, but it occurred to me that when a bear catches fish, it can usually smell them, which it couldn’t if they were in a tank. And it usually sees them from the top, not the side.
I don’t see any reason why a bear wouldn’t recognize fish in a tank. They are pretty intelligent. They probably don’t normally smell fish before they catch them in a stream, and they surely wouldn’t have any problem recognizing one from the side.
I dunno about bears, but my cat seems extremely interested in my aquarium. I don’t know if he knows they’re fish, or even what a fish is, but he watches and watches and watches them.
That is, however, an authentic photograph of the Mekong Giant Catfish *Pangasius (*or Pangasiodon) gigas, the largest catfish in the world and now endangered.
If we assume bears are as smart as raccoons the answer is yes. One night we were sitting in the living room of a friends house looking through the sliding glass door at their patio fish pond. A raccoon came out of the night, took a fish and left.