How to farm freshwater grouper? Key points of feeding and management techniques
Grouper is a marine fish, called black cat fish by people in coastal areas, and it is known as the carp of the sea, but its nutritional value, edible value and various other aspects are higher than carp, and its market price is also relatively high. It is a low-fat, high-protein fish, and its taste is even better than chicken. It is rich in nutrients needed by the human body, and now there is a very mature freshwater grouper farming technology. So how should freshwater grouper be fed and managed? Let's take a look!
1. Breeding management
Freshwater grouper can generally begin spawning after one year of rearing. Its spawning is basically similar to that of tilapia. When spawning, it digs many nests in the mud at the bottom of the pond to place the eggs. After spawning, it guards the area around the nest where the eggs are laid, and leaves when the embryo develops to a certain extent. We must control water quality well. The spawning period of grouper is the key to growth, so prevent water pollution from affecting it and reducing the survival rate of fry. Keeping the water temperature at around 28 degrees can accelerate the hatching speed of the eggs and increase the hatching rate.
2. Fry cultivation
For the growing environment of fry, it is best to choose an earthen pond. The area of the cultivation pond is determined according to the number of fry, and the depth of the pond water must not be less than 1 m. Before cultivation or stocking, drain the pond water, then expose it to the sun and use quicklime powder for disinfection. Apply an appropriate amount of base fertilizer at the bottom of the pond to improve the fertility of the water quality, so that the pond contains a certain amount of plankton. Because plankton can serve as food for the fry, when plankton decreases, an appropriate amount of soybean milk can be fed, and then some bait can be gradually increased. The amount of bait is generally about 1/5 of the total weight of the fish, and the feeding frequency is determined according to the growth situation.
3. Bait feeding
After the eggs hatch, the fry will not exceed 1 cm in length and will swim in groups at the bottom of the pond. Keep the water temperature at 27 degrees for about one consecutive week, and the yolk sac of the fry will gradually disappear. Then the fry will begin to swim toward the upper layer of the pond. After the yolk sac disappears, some plankton can be fed. When they grow to a certain extent, high-protein bait can be appropriately fed. Usually after one month they will grow to 8-12 cm. At this time, they can be raised as adult fish. Judging whether they are adult still needs to be determined according to the weather and surrounding environment of the farming area.
4. Adult fish management
Polyculture can be used to farm grouper, for example, with some freshwater farmed fish such as tilapia. It is mainly based on farming grouper, and the secondary fish should be controlled to prevent overstocking from affecting the growth of grouper. Determine the farming quantity according to the pond area. During farming, appropriately feed bait according to the size and growth of the fish. Pay attention to the number of polycultured fish to prevent them from competing with grouper for food, which could cause malnutrition in grouper. Generally, after about six months of rearing, a portion of them can basically be harvested.
The above are the feeding and management methods for farming grouper. The nutritional value of grouper is very high. Grouper is a tropical fish. It has relatively high requirements for water temperature, and the water temperature must be strictly controlled to prevent it from being too low, because too low a water temperature will affect the appetite of grouper and in severe cases can even lead to death. That is all for today's introduction. This article is for reference only. Thank you all for reading and supporting.