Fetal spots are actually presented by the eggs in the female fish. Because there is a black film on the surface of the egg, and the body of the female fish is very transparent, so when observing the fish, we can see the existence of fetal spots. Foetal spots in guppies are not caused by pregnancy. When they mature in sexual function, fetal spots will appear near the anus. But after the female fish is pregnant, its fetal spot will obviously become larger, and the color will also deepen, so it can be seen more clearly.
guppy pregnancy, its anal fin and pelvic fin between there will be a black triangle color block, this is the fetal spot. At the beginning of the breeding period, the fetal spots of female fish will not be particularly obvious. If you don't look carefully, you can't find the existence of fetal spots. If the female is breeding for the first time, the fetal spot will not be particularly obvious in the early stage of pregnancy. When the small fish are born quickly, the color of the fetal spot becomes thick and heavy, showing obvious black. When a female fish is not pregnant for the first time, it will have a black mark of fetal spot very early in the anus, and will gradually deepen with the time of pregnancy. Therefore, as long as the pregnant female fish is not the first fetus, the time of pregnancy can be roughly judged according to the color of the fetal spots.
