Why do pomfrets expose their "intestines"?
The trout is a small group of fish, with a maximum individual of no more than 200 mm, and most species are only 50 to 70 mm. They live in freshwater bodies of water. It is such an inconspicuous fish, but it has a very interesting feature - exposing the "intestine" to the outside. It sounds unbelievable, why would it do that?
In fact, what we see dragging outside is not the "intestine", but the fallopian tubes. Originally, April to June was the spawning period for the trout. At this time, the male has an orange-red abdomen and pale red fins; the fallopian tubes of the female are extended into spawning tubes, which can be inserted into the inlet pipes of freshwater mussels and laid into the gill cavity of river mussels. Then, when the river mussel breathes, it will suck the nearby water flow with the semen of the male fish into the gill cavity, and the sperm eggs can be combined in the body of the river mussel. The fertilized eggs develop in the gill cavities of mollusks, and after about a month, the juveniles leave their hosts and begin to live independently.
The trout usually lives in still water bodies, especially in the lush environment of aquatic grasses, and likes to swim in groups. During the reproductive season, the male's bright body color and pearl star are more attractive, while the female drags a long fallopian tube, which is more unique in the company of the male.
Fallopian tubes of salmon