We must pay attention to polyculture: ① the pool water should not be too fat; ② The stocking amount should be appropriate; (3) At the initial stage of polyculture, the specifications of main cultured species are more than 3 times that of perch; ④ California perch, especially juvenile, is sensitive to pesticides, so attention should be paid to the prevention and treatment of fish diseases and the application of pesticides. 1. Fish ponds require sufficient water, convenient irrigation and drainage, no water leakage, water depth above 1.5m, good water quality, no pollution, ventilation and light transmission, and loam as the bottom material. The area should not be too large, 1-2 mu is appropriate. Equipped with aerator.
2. The stocking density is generally 4000-5000 California bass fry per mu, and 5000-6000 bass fry can be put in fish ponds with good conditions and equipment. Proper mixed culture of silver carp, bighead carp, grass and bream is helpful to clean up feed residue and regulate water quality. California bass has high requirements for protein, which requires that the feed contains 45-50% crude protein, and the following feeds can be fed during production.
(1) eel feed;
(2) mixing the mixed fish with proper amount of peanut bran, bean cake and corn flour;
(3) Compound feed, the formula is: fish meal 60%, raw bran 10%, wheat flour or corn flour 25%, yeast, vitamins, minerals and additives 5%.
Feeding is usually once in the morning and once in the afternoon. When the water temperature is 20-25℃, the daily feeding amount is 10- 15% of the fish weight, but it should be flexibly controlled according to the fish's feeding, activities and weather changes.
In many places in Guangdong Province, ponds are used for special culture, and the yield per mu can reach 300-400 kg. The feed coefficient of raising low-value fish in seawater is generally 7.5-8, and the economic benefit is very obvious. (1) patrol the fish pond every day to observe the activities of fish schools and the changes of water quality, so as to avoid the pond water from being too turbid or fertile, and the transparency should be 30cm. Find problems in time and take measures to solve them.
(2) Strictly prevent pesticides and public hazards from flowing into the pond, so as to avoid the death of pond fish. Especially young fish are extremely sensitive to pesticides, and a very small dose will cause the death of fry in the whole pond, which must be paid great attention to.
(3) The feeding amount should be appropriate, not too much or insufficient. At the same time, to avoid long-term use of a single feed, vitamins and minerals should be added to the feed to maintain normal nutritional needs.
(4) Grading and thinning seedlings in time, once every two months, stocking fish of the same specification in the same pond to avoid eat small fish. Feeding alone should be carried out in the morning with good weather, and it is forbidden to raise in hot or cold weather. 1. The requirements for the farm are as follows:
(1) Adequate water source and good water quality;
(2) the terrain is slightly inclined, which is beneficial to drainage;
(3) sunny and well ventilated;
(4) loam is suitable as a base material, and sand can be spread on it;
(5) Pollution-free dirt and sewage enter.
2. The area of the aquaculture pond should not be too large, and 50- 100 square meters is appropriate, with earth embankment or cement embankment, but the bottom material of the pond should be soil. You can also use idle eel ponds or other pools. Irrigation and drainage ports should be set opposite each other, and escape devices should be added. If the stocking density is high, an aerator should be installed. If the fry are small, a fishing net should be added to the surface of the pond to prevent birds from hurting them.
3. The stocking amount of fry depends on the management level and environmental conditions, generally 30-40 fry are stocked per square meter. If the water quality is good, the water source is sufficient and there are perfect aerobic facilities, the stocking quantity per square meter can be increased to 50-60. Fish species kept in the same pond require the same specifications and are lively and disease-free. We can't confuse size with size, lest the same species eat each other, and the big fish eat small fish will cause unnecessary losses.
4. Feed feeding is best to feed the feed with high content of protein. More suitable feeds are eel feed, miscellaneous fish and so on. , you can also feed a variety of artificial compound feed. Before feeding, eel feed should be stirred and extruded into granules with proper amount of water, and miscellaneous fish should be cut into pieces with a meat cutter. The newly stocked fry should stop feeding for one day due to moving shock, start feeding a small amount of the original feed the next day, and gradually increase to the normal feeding amount before mixing other feeds. So that the fry can get used to eating. Generally, it is fed twice every afternoon, depending on the weather, water temperature and fish intake. When the water temperature is 20-25℃, the total daily feeding amount is 10- 15% of the total fish in the pond. When the water temperature is too high, too low or the wind and waves are heavy, the feeding amount should be reduced as appropriate.
5. Feeding management refers to the management of fish ponds.