Are there male and female fish?

Speaking of fish, I believe they are very common in our daily lives. No matter they are edible fish or ornamental fish, we can often see them in our daily lives. However, many people are curious about fish. Are there male and female fish? There should be, because when we eat fish, we sometimes eat fish with a lot of fish eggs in its stomach. However, some people say that fish are hermaphroditic and there is no distinction between male and female. What is the truth? Let's talk about the question of whether there is a distinction between male and female fish.

Fish are divided into male and female. Some fish are born with one reproductive system, such as only testes or ovaries. Their distinction is complex and diverse. But generally speaking, male fish are more beautiful, such as guppies.

Some fish are born with two reproductive systems. For example, groupers have testes and ovaries in their bodies, but they are fertilized outside the body. Groupers are ovarian-premature. So they are female first, and then become male. It is not that they can change whenever they want. They have to wait for a certain number of years before they can become male. That is to say, their ovaries develop first, and the testes are basically a small dot. After a certain number of years, their ovaries begin to shrink and the testes continue to develop, and they become males.

There are ovary-first maturation types. Naturally, there are testis-first maturation types. For example, the eel belongs to the testis-first maturation type. Regardless of whether it is the testis-first maturation type or the ovary-first maturation type, they are all fish that can change their sex.

Now some people say that "single-sex fish" are actually fish that have their testicles and ovaries removed artificially. They grow faster and are often used in artificial breeding. For example, African crucian carp. Some fish are given drugs or radiation to destroy their reproductive system before they develop and their testicles and ovaries are just a little bit. This kind of fish has no reproductive ability, just like the pigs we raise.

The male fish's genitals are slightly thinner and pointed, while the female fish's genitals are thicker and oval.

Specific identification method:

1. Observe the body shape. The female fish is short and round, while the male fish is slender. If you are raising species such as high-head, tiger-head, and lion-head, you can observe their heads. The tumor of female fish is lower and less plump, while that of male fish is higher and fuller.

2. Observe the gill cover. During the breeding season, the gill cover of male fish will have sparse protrusions in the shape of dots. The female fish's pectoral fins are short and rounded at the end, while the male fish's pectoral fins are longer and pointed at the end. There are also stars on the pectoral fins during the breeding season. The female fish's cloaca is round and slightly larger, pear-shaped, with the handle tip facing forward, close to the pectoral fin, and slightly convex outward; the male fish's cloaca is slightly smaller and prismatic, like a date pit, with pointed ends and a bulge in the middle, flat and slightly concave.

3. During the breeding period, female fish swim slower and react more slowly; male fish swim more actively and chase more agilely.

4. Observe the abdomen of the fish. The abdomen of the female fish is soft, with no obvious hard ridges from the abdomen to the anus, and its abdomen swells and becomes round during the breeding period. The abdomen of the male fish is harder, with obvious hard ridges from the abdomen to the anus, and it does not swell during the breeding period. However, this point cannot be misjudged, because some goldfish species, regardless of male or female, have a swollen and round abdomen, so you must be careful when identifying them.