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Can blackfish be cultured through cages?
1. Cage specifications: When breeding black fish in a cage, it's important to use a compact design that allows for easy movement across different areas. Typically, the cage size should be between 15 to 33 square meters. The mesh size of the netting should be selected based on the size of the black fish and the bait fish, ensuring that it is not too large to allow escape. Proper mesh sizing helps maintain control over the fish population and prevents losses.
2. Stocking density and size: For optimal growth, the stocking density should be around 5-50 grams per square meter, with 8-16 fish per square meter. It's crucial to keep the same species and size within each cage to avoid aggression and cannibalism when food is limited. Stocking should ideally be completed before the end of April. If the fish are not available all at once, they can be introduced gradually over time.
3. Selection of black fish species: Most black fish available today 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 by hook fishing. Avoid any fish that show signs of injury, as they may have reduced survival rates and could negatively impact the health of the entire stock.
4. Providing habitat and shelters: To create a more natural and stress-free environment, it's advisable to introduce some aquatic plants into the cage. These plants should cover no more than 70% of the water surface, providing hiding spots and shelter for the black fish, which helps reduce stress and improve overall well-being.
5. Feeding method: Black fish are carnivorous and prefer live prey such as small fish, shrimp, or quail. Avoid feeding them hard-spined fish, as this can cause internal injuries. Feeding should start from late April, with daily feed amounts ranging from 2% to 5% of the total weight of the black fish. The bait fish should be small enough for the black fish to swallow easily. The annual feed conversion ratio should be kept around 4 for efficient growth.
6. Anti-escape measures: To prevent black fish from escaping, the top part of the cage above the water should be extended vertically by about 1 meter. Additionally, a hood net with a width of approximately 0.5 meters should be added to the top of the cage. Regular inspections are necessary to check for damage caused by water rats or other predators, ensuring the integrity of the netting and preventing escapes.