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That is not an easy answer because there are so many breeds of fish. some are easy to tell by a special fin underneath, by the bottom fin used for spawning (mating) .eg. swordtails or guppys. Some others have elaborate fins or colors. eg bettas. a lot of breeds have no noticable differences. The best way to find out is to research the specific types and breeds of interest.

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17y ago

What else can I help you with?