Australian freshwater lobster is native to tropical Australia, which grows rapidly and generally reaches sexual maturity at the age of 6- 12 months. Sexually mature Australian freshwater lobster will naturally breed in the pond when the water temperature reaches above 265438 0℃. Australian freshwater lobster has a long breeding history. After spawning and fertilization, its eggs are hatched by the mother. Australian freshwater lobsters can lay eggs 2-3 times a year.
The following points should be paid attention to in shrimp fry culture: ① Conditions of the culture pond: For the convenience of management, the culture pond is generally a cement pond with a water storage depth of 1m, which requires convenient water intake and drainage. At the same time, hidden objects are placed at the bottom and water surface of the pond, accounting for 1/4- 1/3 of the bottom and water surface of the pond, so as to increase the effective habitat area of shrimp larvae. ② stocking density: the stocking density in the breeding pond should not exceed 1000 /m2 in the first four weeks of larval cultivation, and proper sparse planting and timely separate cultivation are beneficial to improve the survival rate. (3) Bait feeding: In the first three days of seedling raising, young shrimps can be fed with steamed eggs and fish paste scattered around, and gradually replaced with crude protein. The daily feeding rate of shrimp seedlings is 3-5 times a day. And according to the water temperature, food intake, growth and appropriate increase or decrease. Avoid excessive feeding, and there should be no residual bait and waste deposition in the water. ④ Water quality control: The water quality is required to be fresh and slightly transparent, preferably with running water. Clean up in time.
Adult shrimp culture should pay attention to the following points: ① pond conditions: the pond used for Australian freshwater lobster culture has good water intake and drainage system and aeration system, no leakage, and escape prevention facilities. Before stocking, the pond must be cleaned to prevent enemies and pathogens from staying in the pond. The method is the same as that of a common fish pond. Australian freshwater lobster likes shade and fears light, and is good at climbing and escaping. Aquatic plants (about 65,438+0/3 water surface) and aquatic plants (black algae, etc.) are required on the water body. ) planted at the bottom of the pond, bamboo tubes or other similar objects can be set at the bottom of the pond for digging holes. ② Release of shrimp fry: After 7- 10 days, the toxicity of limewater disappears and the water quality is normal, so the shrimp fry can be released. But be careful not to mix carnivorous fish with other carnivorous fish, so as not to affect the growth of crayfish. ③ Water quality management: In general, water quality management is mainly to ensure that the dissolved oxygen in shrimp pond water is sufficient and the water quality is fresh and good. Spraying limewater regularly can improve water quality and increase calcium, which is beneficial to shelled shrimps and improve survival rate. (4) Feeding management: fish and shrimp are mainly fed with bait, and feeding is combined with fixed-point splashing by the pool. Because Australian freshwater lobsters are omnivorous saprophytes, it is necessary to appropriately increase plant feed. ⑤ Capture: There are two ways to capture crayfish: trapping in shrimp cages and fishing in dry ponds. When the water temperature drops below 18℃, there is no need to overwinter in the adult shrimp pond, just drain the pond water and collect the shrimp in the pond.
Attention should be paid to the prevention and treatment of shrimp diseases in the breeding process: Australian freshwater lobsters are prone to a "crayfish plague", which is caused by a fungal infection. As long as the water temperature is controlled above 265,438+0℃ during stocking and fishing, crayfish will not get sick.