Fishes with a tail is girl or boy?

You're thinking about the old wives' tale that says fish with a long tail are female and those with a short tail are male.

This is not true.

Fish gender is determined by a variety of factors, including:

* Genetics: Some species have sex chromosomes (like humans), while others have other genetic mechanisms.

* Environmental factors: Temperature, water conditions, and even social interactions can play a role in determining gender in some species.

* Hormonal changes: Hormones can also influence sex development in fish.

You can't tell a fish's gender by looking at its tail.