ANSWERS: 2
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Yes it is possible. People have trained fish to ring a bell at feeding time and also to swim through hoops. Check out this website discussing teaching bettas how to do tricks: http://www.waynesthisandthat.com/trick.htm
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It may be possible. But improbable. A beta fish's short-term memory is about 3 seconds long. It's long term is about 1 week. Therefore an entire trick would need to be taught, practiced, and performed in less than a week. And then the fish would lose it. This also accounts for the very low movement a Beta fish does.
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