1. Sorting of seeds and seedlings: if the fry before stocking is tidy, it can be stocked. However, artificial breeding techniques for groupers have not yet been fully passed. Most of the fish fry are caught by fishermen. This type of fry is inhabited by rocky gaps and cannot be fenced up with a large number of nets. Therefore, they are all sporadic acquisitions of different sizes. After this type of fry receives the amount of stocking, it is necessary to sort and divide the stocks according to their size, so as to avoid disparities in size and cause mutual grueling.
2. Stocking Density: According to production practice, in the small cement tank (551 cubic meters) equipped with oxygenation equipment, the maximum stocking capacity is 12 fish/square meters, and this density is kept from fry rearing to harvest. In this way, the pool water is changed once a week or so (high temperature season is usually 2-4 days to clear the pool, change the water once), and the water level can be kept to about one meter.
3. Feeding: The bait used is mainly based on miscellaneous fish. When juvenile, use a mincer to crush the mixed fish and mix it with fish meal or oyster meal. Position the feeding once a day in the evening. When fish is given, it is slowly given to the fish. As long as about 75 grams, under the fish can be cut into appropriate size of the block vote. When feeding, you need to know the feeding conditions of the fish and consider how to feed it so that it will not affect the water quality.
4. Water temperature and growth: The suitable water temperature for grouper is 25-30°C. When the temperature is below 20°C, the food intake is greatly reduced. Below 15°C, no food is eaten. Therefore, winter should not be cultured. The breeding period is from March to November. Raising fry should be selected large, such as 50-100 grams or 100 grams or more. Seedlings of this size can reach the market specification by the end of the year, with an average weight gain of 50-100 grams per month per month, and a meat growth factor of 4 for each month.
5. Harvest: The weight of general listed groupers is preferably 0.6-1.5 kg. The harvest time is generally completed before the cold weather. After the pool fish are cleaned up for sale, a few grouper species that do not meet the market specifications need to be overwintering, otherwise they will be easily affected by the cold current and lead to death. At low temperatures, parasitic group parasites often cause death.
Groupers live longer in the air, as long as they keep the fish wet and avoid the sun, 1-2 hours of transport can still survive.
Grouper culture is currently divided into three types: land-based pond culture, cage culture, and levee culture. This issue introduces pond rearing techniques: