Culture techniques of freshwater grouper

Because of its beautiful appearance and delicious meat, freshwater grouper can be used not only as an ornamental fish, but also as a commercial fish to gain profit value. Today, freshwater grouper has become a new type of singular culture species. So what are the culture techniques of freshwater grouper? What is there to pay attention to? Let's take a look.

Culture techniques of freshwater grouper

Freshwater grouper is a kind of tropical fish, which generally grows in fresh water and is partial carnivorous fish. the cultivation of freshwater grouper can adopt mixed culture, and two methods can be used in mixed culture.

1. Mixed culture of a small amount of freshwater grouper in the pond, about 22 per mu of freshwater grouper, after half a year of culture, the average body weight can reach more than 300 grams, after one year, the body weight can reach about 500 grams.

two。 The main fish culture is freshwater grouper, mixed culture species are tilapia, grass carp, crucian carp, etc., 150 per mu of freshwater grouper, 300 mixed fish, feeding artificial compound feed during breeding, but also fresh and tender forage, when there is a shortage of zooplankton in the pond, it needs appropriate amount of topdressing to cultivate zooplankton. After half a year of culture, the average weight of freshwater grouper can reach about 200 grams, after a year of culture, the body weight can reach more than 250 grams.

Breeding techniques of grouper fingerling

1. Fish fry requirements: freshwater grouper fry culture pond to soil pond is better, you can also use outdoor cement pond, generally a single pond area of 50ml 100m ³, water depth of 1.5m. Before releasing the fry, drain the pond water, thoroughly clean the pond with quicklime, and apply sufficient basic fertilizer to improve the water quality, so that the fry can eat natural bait in the pond.

two。 Fish fry stocking: fish fry should be tested before they are released. The specification of stocking in the same pool is neat and the size is the same. The stocking density depends on the bait, breeding technical level and cultivation specifications, and the general stocking density is about 100 tails / m3. The fish fry should be soaked in sop salt water for 15 minutes for 20 minutes before entering the pond.

3. Feeding: when freshwater grouper larvae go down to the pond, they feed on zooplankton. With the growth of fish fry, the food intake increases, while the zooplankton in the pond gradually decreases. At this time, zooplankton can be cultivated by topdressing, and soybean milk can be fed on the other. After 20 days of cultivation, when the fry reached more than 3 cm, the feeding habits of the fish began to change, and then surimi could be fed on the table. 2 after 3 days, a small amount of artificial formula feed was mixed with surimi, and then gradually increased the proportion of artificial formula feed, reduced the amount of surimi, until all artificial formula feed was used. The daily feeding amount is about 20% of the body weight of the fish, and the bait is given 3 times a day.

4. Cultivation and management:

(1) regulating water quality: in the process of fish fry cultivation, the residual manure bait is the most likely to spoil the water quality due to fertilization and feeding. For this reason, the water should be changed every 5 days, and the amount of water each time is 1 × 4 of the pool water. Some aquatic plants such as duckweed or water hyacinth can also be transplanted in the pond to purify the water quality and facilitate the concealment and feeding of fish fry.

(2) timely separate culture: when the growth specifications of fish fry are quite different, because they have the habit of eating big and small, they should be screened and raised in time. The specifications of fish fry in the same pond should be consistent so as not to affect the survival rate of fish fry.

(3) Daily management: mainly patrol the pond and observe the eating, activity and water color changes of fish fry, so as to adjust the feeding amount in time and do a good job in preventing fish diseases.

Food management of freshwater grouper

Freshwater grouper larvae have a total length of 0.58-0.6cm, and the clusters move constantly at the bottom of the pond. When the water temperature is between 26-28 ℃, the yolk sac disappears completely on the sixth day after hatching, and the larvae swim to the middle and upper water layer. The larvae are no longer clustered at the bottom of the pond, and the small fry after yolk disappearance can be fed to rotifers, cladocera and other small zooplankton. When they are older, they can be fed with high-protein agglomerate artificial bait for domestication. After about a month of cultivation, the body length of about 10cm can be used for adult fish culture in the pond. In the southern region, the summer time is relatively long, and the fry whose length is about 10cm can reach more than 500g after 100 days of culture. The maximum weight of freshwater grouper can reach more than 1200g.

Living habits of freshwater grouper

Freshwater grouper is a tropical fish that grows in fresh water and can also grow in seawater with a salinity of less than 10%. The suitable temperature range is between 25 and 30 ℃. When the water temperature drops to 20 ℃, the food intake decreases obviously, and when the water temperature drops to 15 ℃, the body loses balance, so the area where the pool water will drop below 15 ℃ during winter is not suitable for breeding this kind of fish, unless there are heat preservation measures. It is better to keep the water temperature above 19 ℃ during overwintering. Freshwater grouper is a bottom fish with strong resistance to hypoxia and disease. Fish disease rarely occurs in the process of culture. It can be mixed with tilapia and crucian carp to remove small fish fry in tilapia and crucian carp ponds to achieve high quality and high efficiency.

Freshwater grouper is a carnivorous fish, fish fry stage, carnivorous characteristics are very strong, mainly zooplankton, individual differences of fish fry will kill each other, so culture should pay attention to hierarchical pond management. After breeding, the seedlings should be pulled out in time so as not to be swallowed by parent fish. Starting from the domestication of fish fry, it will eat artificial compound feed, which can be fed with floating eel fish feed.

Above we understand the culture technology and living habits of freshwater grouper, only by mastering reasonable and correct culture methods, can we raise very healthy grouper, so that we can obtain economic value. I hope this article can help you all.