In late April, the broodstock begins to mate and lay eggs. The mating is soft-shell mating. Before mating, the female shrimp must undergo reproductive molting. The female shrimp begins to lay eggs within 12 hours after the male shrimp produces sperm.

The eggs produced by female shrimp are dark yellow after fertilization and adhere to the hollow formed by the inward curling of the abdominal legs and tail fan. An egg-bearing shrimp weighing 48 grams can hold 326 eggs. The shrimp with a high egg number can hold 441 eggs, and the shrimp with a low egg number can only hold 27 eggs.

The fertilized eggs are dark yellow, and gradually change to yellow-orange, red-orange, and light gray as the embryos develop. The egg-bearing shrimps were divided into four groups for a comparative test on embryonic development. It was found that: under 19°C, red Embryonic development is extremely slow;

At 21 to 23°C, the hatching time is 41 days, and the juvenile shrimps are separated from the mother in 80 days; at 26°C, the fertilized eggs hatch in 30 days, and the juvenile shrimps hatch in 52 days. Detached from the mother; at 29-30°C, the membrane hatches in 25 days and separates from the mother in 40 days.

Extended information:

After the shrimp larvae are hatched and collected, they are raised in earthen ponds. In the early stages of growth, the larvae mainly feed on organic debris and single-celled algae such as chlorella. Whether the organic debris and single-celled algae in the water body are abundant is crucial to improving the survival rate of shrimp larvae. If the amount of bait is insufficient, cannibalism will occur.

There are basically no remains of zooplankton such as cladocerans and copepods in the intestines of juvenile shrimps. This is mainly due to the poor mobility of juvenile shrimps and the difficulty in obtaining zooplankton. After 7 weeks of rearing, the average size of the larvae can reach 7.6 cm.