11-20-2008, 06:01 PM
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Well, fish can't exactly take an IQ test, so I think it's pretty impossible to rank them by intelligence. Generally the "smarter" fish are the ones that exhibit some sort of interesting behavior other than just swimming around, eating, pooping and breeding. For example, my female betta spends all day hunting imaginary worms in the gravel. My girlfriend's female betta will randomly get really angry at a snail and attack it until it shrinks back into its shell. Many bettas, as well as puffers and cichlids, will swim up to the glass and beg for food. It's fun to watch guppies interact with each other, especially the males doing the mating dance for the ever unamused females.
Are you trying to get fish to do your homework for you? If not, I wouldn't worry about how smart the fish are and instead just pick ones that have behaviors that are interesting to you.