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Can blackfish be cultured through cages?
1. Cage specifications: When breeding black fish using a cross-country scissor aerial work platform, the cage size should be small, typically ranging from 15 to 33 square meters. The mesh size of the net should be selected based on the size of the black fish and the bait fish, ensuring that it is not too large to prevent escape. It's important to avoid overly large mesh sizes as this can lead to loss of fish.
2. Stocking density and size: The stocking density for black fish should be between 5-50 grams per square meter, with 8-16 fish per square meter. It's crucial to maintain uniform size within each cage to avoid cannibalism due to insufficient food. All stocking should be completed before the end of April. If the fish are not available in one batch, they can be stocked gradually over time.
3. Selection of black fish species: Most black fish currently used in aquaculture come from natural populations. When selecting fish, it's recommended to choose those caught using fishing nets such as dip nets, cormorant nets, or Kyushu bags, rather than those caught with hooks. Avoid any fish that show signs of injury, as they may be more susceptible to disease or stress.
4. Providing habitat shelters: To create a suitable environment for black fish, some aquatic plants should be introduced into the cage. These plants should cover no more than 70% of the cage area, providing shelter and a sense of security for the fish.
5. Feeding methods: Black fish are carnivorous and prefer live prey such as small fish, shrimp, or quail. They should not be fed with fish that have sharp spines, as this can cause internal injuries. Feeding should begin at the end of April, with daily feeding amounts around 2-5% of the total weight of the fish. The size of the bait should be manageable for the black fish to swallow easily. The annual feed conversion ratio should be kept around 4.
6. Anti-escape measures: The portion of the cage above the waterline should be at least 1 meter high to prevent black fish from jumping out. Additionally, a hood net with a width of about 0.5 meters should be added to further secure the enclosure. Regular checks should be conducted to ensure that the netting has not been damaged by rodents or other pests.