Fish different between male and female?How to tell?

male fish is more colorful, and the fins are longer, the forhead of bigger fish you will notice that it have curve while the female forehead is only slanted. the guppies, the swordtail, the black molly, they have longer fins, and they have there things under their belly you will see it, if they were chasing the female.

There are many fish that are different between males and females. One example is the guppies where the males have longer fins plus the anal fish is modified to be able to pas sperm into the females. Another is the bettas (Siamese fighting fish( where the males will get longer fins and also will be more aggressive. Other fish have fins that are different shaped or different colors. You need to look up in books or ask a person that is knowledgeable about the particular fish to let you know the differences.