wild fishes

Question
How a fish eating fish or a wild non friendly to other fish (oscar or betta  etc )look like? describe how to identify them from their physical features & behaviour.i know there are some but wanna know more.thanks.

Answer
Hi Mick,
 I am not quite sure I understand your question.  If you are asking how do you tell predatory fish from other fish, the general answer is that fish that are predators on other fish tend to have larger mouths and bigger teeth.  

-- Ron C.
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