How do prawns reproduce

There are many friends who like to eat shrimp, and we should be no stranger to shrimp. But know the cooking methods, do not know the growth process of shrimp, such as how shrimp reproduce? Let's have a look together!

How do prawns reproduce

1. Parent shrimp culture

The parent prawns with a female-to-male ratio of 1:1 were fed in a 6 × 8 × l meter cement pond covered with glass steel tiles and heating system, and fed with freshly chopped lobster heads at 10% of their body weight every day. The outer front of the red crayfish is red and bright, and the length of the claw is longer than the body length, while the claw of the female is basically blue and the length is less than the body length. The reproductive process of the mature male shrimp is obviously rod-shaped at the base of the fifth step foot, and the reproductive pore of the female shrimp opens at the base of the third step foot. Put some washed and sterilized net pieces in the parent shrimp pond as a shelter for parent shrimp, absorb dirt and change water every day, and keep light 12I:12D (12 hours light, 12 hours dark).

2. Mating and spawning

Parent shrimp began to mate and lay eggs in late April. The mating of red crayfish is soft shell mating. Before mating, the female shrimp has to reproduce and molt, and the female shrimp begins to lay eggs within 12 hours after the male teacher produces sperm. The eggs produced by female shrimp are dark yellow after fertilization and adhere to the fasting stomach formed by the inward curl of the abdominal foot and tail fan. A shrimp weighing 48 grams carries 326 eggs, while the shrimp with a high egg count holds 441 eggs and the low shrimp holds only 27 eggs.

3. Embryonic development

The fertilized eggs of red crayfish were dark yellow and gradually changed into yellow-orange, red-orange and light gray with the development of embryo. The egg-holding shrimp was divided into four groups for embryonic development. The results showed that the embryonic development of red crayfish eggs was very slow at 19 ℃, hatching time was 41 days and 80 days at 21 ℃, 30 days after fertilized eggs and 52 days after 26 ℃, 25 days after hatching and 40 days at 29 ℃.

4. Larval cultivation

The larvae of red crayfish were hatched and collected and reared in soil ponds. At the initial stage of growth, the larvae mainly fed on unicellular algae such as organic detritus and Chlorella. The abundance of organic detritus and unicellular algae in water is very important to improve the survival rate of red crayfish larvae. Through the anatomy of the young shrimp, it is found that there are basically no remains of Cladocera, copepod and other zooplankton in the intestines and stomach of the young shrimp, which is mainly due to the poor mobility of the young shrimp. After 7 weeks of feeding, the average size of larvae can reach 7.6 cm.

On the question of how shrimp reproduce, Tuliu.com will summarize it for you today. I hope this article will help you.