The female has a round abdomen. The male has a protrusion--sort of like this __, (only wider) behind his abdomen. He will chase the female and move the organ sideways toward the female, in order to breed her. Egg laying fish are much more tricky to raise! Get yourself a really good book, such as The Encyclopedia of Fishes, and do a lot of reading. It's really helpful. It's just one hardback book.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden