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the blue one is male and the others female
Well, The Male Zebra Danio are usually "Smaller and Slimmer" while the Females are Bigger especially when they are going to have fry.
Feeder fish, How do you tell male from female of the?
You can tell if someone is male or female by their reproductive parts.
How do you tell a male pacific frog from a female
You can tell the sex of a danio by looking at its belly. Females will be plump and males will be longer and skinnier.
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]
Because the male has a mane and the female does not have a mane.
Males have longer pointed dorsal fins. Females' dorsal fins are shorter and round.
When they are fully feathered, the male will have feathers that curl on his tail and the female doesnt. This is how you tell if they are male or female without handling them
When they are fully feathered, the male will have feathers that curl on his tail and the female doesnt. This is how you tell if they are male or female without handling them