Culture techniques of freshwater grouper

Freshwater grouper was introduced into Taiwan in the last century and later developed into a species of freshwater fish widely cultivated throughout the country, which can be used as both ornamental fish and edible commercial fish. So, today, the editor will take you to understand the culture technology of freshwater grouper.

I. Life habits

Freshwater grouper can grow in fresh water or in seawater with a salinity below 10 ‰. The optimum temperature 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 drops below 15 ℃ in winter is not suitable for aquaculture. If these areas want to breed, you can use a heater. During the overwintering period, the water temperature for the growth of freshwater grouper should be above 19 ℃. The food habit of freshwater grouper is carnivorous, and the carnivorous characteristics of fry stage are strong, mainly zooplankton.

Second, breeding habits

Freshwater grouper has the same spawning habit as tilapia, digging many spawning nests at the bottom of the pond, spawning usually takes place in the afternoon, after spawning, females mainly guard fertilized eggs, while males also cooperate to guard, but with the development of embryos, the guard behavior is getting weaker and weaker, the eggs of freshwater grouper are oval, the color is opaque yellow and dark green, and the eggs are scattered on the bottom of the pond, with little overlap. The female with a weight of 140g lays about 3000-4000 eggs each time, and the larvae can be hatched after 48 hours at a water temperature of 26-29 ℃.

3. Seedling cultivation

1. Disinfection and stocking

Freshwater grouper should be sterilized and fertilized with quicklime before fry rearing, and the water should be tested before fry restocking, and the specifications for stocking in the same pond are the same, otherwise there will be fights, which is not conducive to the growth of fry. The stocking density depends on the bait, the level of culture technology and the cultivation specification.

2. Water quality management

The cultivation of freshwater grouper fry is easy to damage the water quality, so the water should be changed every 3-5 days, and the amount of water can be changed every time. Aquatic plants can be transplanted in the pond to purify the water quality. At the same time, it is also convenient for fish fry to hide and eat, and should be screened and cultured when there is a big difference in fry specifications.

Fourth, bait feeding

1. Feeding of larvae

The diet of freshwater grouper is carnivorous, so the larvae feed on zooplankton when they go down the pond, and with the growth of fry and the increase of food intake, the number of zooplankton in the pond decreases gradually, so it is necessary to fertilize and cultivate zooplankton, or add feed to meet the growth needs of grouper.

2. Domestication of larvae

Freshwater grouper larvae can be domesticated when they reach more than 3 centimeters, feed surimi on the table, add a small amount of formula feed to mix surimi after 3 days, and gradually increase formula feed until all formula feed is used, which can make the fish less dependent on plankton and more convenient to raise.

3. Input and feeding management

The daily feeding amount of freshwater grouper is about 20% of the body weight of fish, the protein content of formula feed is 35-40%, animal protein should be more than 25%, and other plant protein raw materials can be added, so as to meet the nutritional needs of freshwater grouper.

V. Adult fish culture

1. A small amount of mixed culture

A small amount of freshwater grouper can be mixed cultured in ponds, about 25-50 freshwater groupers per mu of water surface, and the average body weight can reach more than 300 grams after half a year.

2. Pond main culture,

Freshwater grouper can be mixed culture of tilapia, grass carp, crucian carp, etc., 150-200 per mu of water surface, 300 mixed culture fish, the average body weight can reach about 200 grams after half a year, after the body size is too large, it should be screened and raised.

The above is the freshwater grouper culture technology summarized for you by the editor of Tuliu.com. I hope I can help you!