2. One-time annual breeding (select one):
(1) release shrimp fry, with a scale of 1.5 cm for every 50,000-60,000, and the suitable time is June-July;
(2) release cultured shrimp species, with an area of 20-25 kg, scale 1000- 1600 fish/kg, and suitable time 12-2 months;
(3) Raise shrimps with eggs, 2-3kg per mu.