For carry out breeding it is essential to distinguish between male and female rainbow fish.It is quite confusing in its early stage means when they are young .Especially when you brought them from aquarium shop.But as the time passes the males starts developing vibrant color as compared to female.By looking at their colors you can say which one is male and which one is female.Female seems to have dull color as compared to males.You can also tell by looking at their dorsal and anal fin.Males tends to have longer dorsal and anal fin as compared to females.In males generally first dorsal fin reaches to the second and even extends it then it might be a male rainbow fish.The above one is male and below one is female.
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