Chanos chanos Forskal (Chanos chanos Forskal) is the only extant species in the family of lice, commonly known as milkfish, hemp lice fish, plugfish, seagrass fish and so on. Chanos chanos Forskal is a widely saline tropical fish, can live in freshwater, the optimal growth salinity of 12-30. 16-39 ℃, the water temperature down to 15 ℃ when its activity becomes weak, below 9 ℃ within a few minutes of death. Lice are active, like to swim in groups, are plant-based omnivorous fish, can be fed with feed. There are mainly rough culture and intensive culture. Northern areas of lice breeding can be used in Taiwan, Guangdong, Guangxi, Hainan and other regions around the Ching Ming Festival fry in the greenhouse or indoor cultivation to the appropriate temperature into the pond culture, the year up to 500g or so, the winter shall be indoor overwintering, 2-3 years up to 1,000-2,000 g. Fry 0.5-0.7 yuan per tail, bait and bait, and the fish can be used in the pond culture. Fry 0.5-0.7 yuan per tail, bait coefficient 1.2-1.6, bait cost per kg of fish 3.6-4.0 yuan, the total cost of fish farming per kg of 7.0-8.0 yuan. The market price is 15-20 yuan per kg, and the acre yield can reach 100-500 kg. The technical points of lice pond culture are summarized as follows: 3.1 Daily management
Patrol the pond once a day in the morning, midday and evening, and observe the condition of the pond water, the fish's physique, growth, feeding, and whether there is a foreshadowing of floating head. Regularly measure water temperature, pH, dissolved oxygen, salinity and other water quality indicators.
3.2 Water quality regulation
The whole aquaculture process water temperature should be 20-30 ℃, salinity 12-30, pH 7-8.5, dissolved oxygen 4mg / L or more, transparency of 30-50cm. depth of 1.5m. Water depth of 1.5m or more, according to the water quality conditions in a timely manner to add water, the amount of water change in the first 10%, in the middle and late up to 20% -30%. Finishing pool equipped with an oxygenator, every 3-5 acres of a unit, the first day at noon to start, so that high temperature, high dissolved oxygen of the upper water and low temperature, low dissolved oxygen, organic matter-rich lower water is fully mixed in the middle and late to increase the time of the oxygenator start time, the daily start time in the 10-20 hours.
3.3 Baiting management
Pre-seedling release focus on fertilization and cultivation of planktonic and benthic single-cell algae in the water, to promote the growth of fish fry, finishing pool or mixed pools with shrimp and other mixed pools should be fed with bait. In line with the principle of feeding a small number of times, feeding 3 times a day in the early stage, feeding 4-6 times a day in the middle and late stage. Feeding according to the fish weight of 8%-3% to determine: fish weight 40-120g 8%-6%, 120-300g 5%, more than 300g 4%-3%.
3.4 Disease prevention
Regulate and stabilize the water quality, prevent pH and ammonia nitrogen from being too high, regularly apply microbial agents and zeolite powder to purify the water, apply chlorine dioxide and so on to disinfect the water quality, and feed medicated bait to prevent and control related diseases. According to the market price, water temperature, fish specifications and other factors to determine the time to harvest at the right time. The specification of the bait for sale is 100-150 g. The time of harvesting adult fish is in the second half of September and the first half of October.