Causes of low rate of females in the process of breeding of semi-slip tongue licking

The number of females in the natural sea area is slightly higher than that of males. In the artificial breeding environment, many people feel that males are more than females, but the proportion of males and females is closer to 1:1. The reason why the ratio of male to female fluctuates in the artificial breeding environment is that the survival rate of the seedlings under artificial breeding conditions is high, and the breeding environment is somewhat different from the natural sea area. Some female phenotypes are male, and people feel that there are more males.

The gonadal development of the semi-slip tongue licking begins between 30 days and 40 days after hatching. In various management factors, the water temperature of the nursery can significantly affect the gonad development. When the water temperature is relatively high, many female fish fry appear false male phenomenon, and the male proportion in fry can increase to about 70%. When the temperature is low, the proportion of males in the fry is also increased, and the proportion is about 60%. Therefore, the high temperature has a greater effect on the development of gonadal glands in the semi-smooth tongue. According to the existing literature, when the water temperature for raising seedlings is around 24 degrees, the ratio of male to female in fry is close to 1:1.

Breeders often discard small fish when they breed semi-slip tongues. This leads to the loss of some male phenotypes, which increases the proportion of males. The current experiments show that the temperature only affects the development of female gonads and does not affect the development of male gonads. This is another important reason for the low female rate during the process of culturing the semi-slip tongue.

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