Some can be like betta males have longer fins then females.
Or you can see a webites that have photos of the fish you will like too see the difference of the female or male. You can Google (or others like Yahoo) and type down the fish name with gender ( also make sure you write down photos or picture in it) then you can see difference.
The features vary from species to species. But, generally, the male fish are smaller and attractive than the female ones.
Feeder fish, How do you tell male from female of the?
Both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
You can tell a male angel fish from a female one by all the colorful stripes it has. [the male one]
yes
Well one has male reproductive parts the other female parts
the blue one is male and the others female
Well, male and female aquatic turtles are easy to tell apart in a few years. If they are not at least 4inches long, you cannot tell what is a male or a female. A female is usually much more bigger than males when they are grown-up. Also, a female has a more broader head (neck) than a male. A male has a longer, thicker tail than a female, and it has much more longer, nastier nails than a female. Those are about it how you can tell them apart. I hope this helped you.
Males are somewhat larger.
their bellies
By performing an experiment
If this is a reference to emus, both male and female emus have blue on their necks. It is impossible to tell the male and female apart by appearance alone.
A girl Betta is dull and not as pretty as the male. But, a boy Betta is colorful and pretty to attract the female mate.