By their genitals, males are larger that females
Females are less aggressive
They have virtually no sexual dimorphism. Just by looking at them you will see no difference between the sexes.
what is the difference between a male and female show me in picture
They just know......
A female bicycle have bigger seat than the male bicycle. That's how you know the difference.
the male is the fatter one
Primarily it is not a Physical difference depending on what type of fish but the common gold fish would need blood work to cheek the sexually orientation.
That all depends upon the species of fish, Some are easy to differentiate between and others are impossible to tell.
This is very difficult. It's done through "venting." The vent is the opening between the anus and the anal fin where the fish will excrete either eggs or sperm. Usually the vent is larger in females. It raelly just depends on the type. In some cases, if there is an "egg spot" on their anal fin, it means that the fish is male.
By its abdomen. Female: 6 segments. Male: 8 segments.
What exactly is a fish coin?
Telling the difference between a male or female tortugas can be done by viewing the underside of the animal. The male and female have different patterns and marking on their undersides.
triops are male and female they are both sex.triops are in some kind of spiecal family.i dont know the names.if you just have one triop in can still have eggs.they can fertilise they eggs by thereselves and can have egg when ever they feel like it.