CATDOLL : CATDOLL: Grouper has good market sales. What are the techniques for breeding grouper?

1. Grouper has good market sales, what are the techniques for breeding grouper?

Grouper has good market sales, what are the techniques for breeding grouper?

Freshwater grouper is a subtropical fish species, native to Nicaragua in Central America. It was introduced to Taiwan in 1988. It is a widely cultivated freshwater species in southern Taiwan. It was introduced from Taiwan by breeding companies in Guangdong and Jiangxi in 1996. It has the characteristics of faster growth and development, tolerance to hypoxia, and strong disease resistance. Let’s take a look at the freshwater grouper breeding technology together!

Freshwater Grouper Farming Technology

1. Living habits

Freshwater grouper can grow in thin water or in seawater with salinity below 10‰. The preferred temperature range is between 25 and 30℃. When the temperature drops to 20℃, the feeding rate decreases significantly. When the temperature drops to 15℃, the body is unbalanced. Therefore, areas where the water level drops below 15℃ in winter are not suitable for breeding. The temperature for freshwater grouper to grow in winter is above 19℃. It is a carnivorous fish species with obvious carnivorous characteristics in the fry stage, and mainly feeds on plankton.

2. Breeding and growth habits

Freshwater grouper can lay eggs in one winter. Its spawning habit is similar to that of tilapia, in that it will dig many holes at the bottom of the pond to lay eggs. Spawning usually takes place in the afternoon. After laying eggs, the female fish mainly guards the embryos. The male fish will also help guard them, but as the embryos develop, the guarding behavior becomes weaker. The eggs are oval, yellow-green in color, opaque, and sticky. The eggs are scattered and arranged in the pond, and there is little overlap. A female fish weighing 140 grams lays about 3,000 to 4,000 eggs each time. At a temperature of 26 to 29 degrees Celsius, the embryos can hatch into fry after 48 hours.

Seedling cultivation

1. Disinfection and sterilization before free-range breeding: It is better to use an earthen pond as a breeding pond for freshwater grouper fry. Use lime powder to clean the pond, disinfect it and fertilize the water. The fry should be purged with water before free-range breeding. The size requirements for free-range breeding in the same pond should be consistent, and the relative density depends on the fish bait, breeding technology level and breeding specifications and models.

2. Water management method: Freshwater grouper fry cultivation is easy to damage the water body. The water in the fish tank should be changed every 3 to 5 days, and the flow rate of each water change should be 1/4. Aquatic flowers can be transplanted in the pond to clean the water and facilitate the hiding and feeding of the fry. When the size of the fry is greatly different, they should be screened and kept.

Fish feed feeding

1. Feeding of fry: Freshwater grouper is a carnivorous animal. When the fry are put into the pond, they feed on phytoplankton. As the fry grow and develop, the amount of food they eat increases, while the plankton in the pond gradually decreases. You can cultivate plankton by fertilizing and adding soybean milk.

2. Feeding of fry: When freshwater grouper fry are over 3 cm in length, they can be fed. First, feed fish paste on the feeding table. After 2 to 3 days, add a small amount of concentrated feed mixed with fish paste. Then gradually increase the concentrated feed until all of them are fed with concentrated feed.

3. Feeding management method: The daily feed amount of freshwater grouper is about 20% of the fish weight, the protein content of concentrated feed is 35-40%, the egg white of livestock should be more than 25%, and soybean protein raw materials can be added. The fish feed index can reach between 0.8 and 1.2.

Fish farming

1. Small-scale group breeding: Freshwater groupers can be raised in small groups in fish ponds. About 25 to 50 freshwater groupers can be raised in one acre of river surface. After more than half a year of breeding, the average weight can reach more than 300 grams, and after one year of breeding, the weight can reach about 500 grams.

2. Main breeding in ponds: Freshwater grouper can be raised in groups with tilapia, carp, crucian carp, etc., with 150 to 200 fish per acre of river surface and 300 mixed fish. After half a year of breeding, the average weight can reach about 200 grams, and after one year of breeding, the weight can reach more than 250 grams.

Disease prevention

1. Tail rot disease

[Injury] The patient has hematoma at the base of dorsal fin, and the caudal fin, pelvic fin and pectoral fin are more serious. The fish body color fades, and the physical test parts become swollen and ulcerated. In severe cases, the survival rate is as low as 90%.

[Prevention] Soak the fish in tetracycline or oxytetracycline for 4 to 10 minutes each time, for 2 to 3 times, or spray the entire pool with furazolidone, once a day, for 3 days.

2. Gill rot

[Injury] The diseased internal organs are dark red, the tail end of the gill filaments is hematoma, some gill tissues are atrophied and white, and in severe cases the tissues are rotten and the cartilage is exposed.

[Prevention] Sprinkle sodium dichloroisocyanurate throughout the pond. To prevent the problem, sprinkle 15-20 kg of quicklime powder throughout the pond if the water level is 1 meter per acre.

3. Leukoplakia

[Injury] Irregular vitiligo occurs on the skin of the diseased fish. In more serious cases, the vitiligo becomes a continuous patch. The fish's skin and gills are covered with increased mucus, their movements become slow, their breathing becomes difficult, and they often float on the surface of the river.

[Prevention] Soak the diseased fish in clear water for 2 to 4 minutes to kill the pathogens, or soak the diseased fish in sodium thiosulfate for 2 hours and wash for 2 to 3 days.

4. Vibrio disease

[Damage] The body color of the diseased fish fades, the epidermis swells and ulcers, and it usually occurs from April to November, with the most serious symptoms from April to June. The survival rate can reach more than 90%.

[Prevention] Soak in antibacterial drugs such as imidazocillin for 3 to 5 minutes, or take fish or shrimp supplements orally and mix 3 to 5% into the feed and feed for 5 to 7 days.

Grouper has high requirements for water quality and needs to be farmed in unpolluted water. The water depth for farming is generally more than 1m. The sand for farming grouper is mainly sandy or semi-sandy. Grouper likes to dig holes, so you need to put some stones and tires with holes in the breeding ground. It is best to feed grouper with live bait.

The breeding skills of grouper are to choose the right temperature for breeding, and also to choose some clear places for breeding. It is best to use artificial breeding methods. It is also necessary to maintain a reasonable stocking density. You can put some grouper food in the water for feeding. You should also change the water frequently.

Maintain good water quality, regularly check whether there are any foreign fish species invading the grouper breeding pond, disinfect and sterilize regularly, feed and raise scientifically, and keep the water temperature and oxygen content in the water stable.

Pay attention to the feeding time, pay attention to the feeding frequency, grasp the breeding density, ensure sufficient oxygen in the water, and pay attention to the water quality.

2. How much does a pound of grouper cost at the market now (Shanghai)

Grouper in the market

How much does a grouper cost per pound? A farmed one weighing one to two pounds costs about 30 yuan per pound, while a natural one costs about 50 yuan per pound.

There may be differences in different places.

3. How much does a pound of grouper cost at the market now (Shanghai)

Grouper in the market

How much does a grouper cost per pound? A farmed one weighing one to two pounds costs about 30 yuan per pound, while a natural one costs about 50 yuan per pound.

There may be differences in different places.