Grouper is a warm, medium-to-lower fish on the coast, and often inhabits the coastal reefs. Generally do not form a large group. Ferocious. It is a carnivorous fish and there is the phenomenon of mutual food. Especially in juvenile larvae, individuals are often swallowed by small individuals. Food is mainly crustaceans such as shrimp and crab, followed by fish and mollusks. According to research observations, the feeding cycle of blue grouper has two peaks a year. The first peak occurs in May of spring, and the second peak occurs after August of autumn.
Life habits and growth analysis According to tests, when the grouper is between 22-30°C, the fish is active, has a large food intake, and grows fast; when the water temperature drops below 22°C and below 19°C, the water temperature drops to 19 Below °C, the food consumption decreased significantly, the growth rate slowed down, and the activity decreased with the decrease of water temperature. It was also observed when the indoor pool was overwintering. The water temperature dropped below 10°C and no predation of dead baits, but live crustaceans. Can still choose to eat; when the water temperature drops below 7.5 °C, stop feeding, the fish is in a static state; when the water temperature is lower than 5.5 °C, there will be death.
Groupers have a wide range of adaptation to salinity, and they can survive between 11 ‰ and 41 ,, with a maximum of 30 最.
The breeding season for various grouper species varies, even though the same grouper species also differ from place to place. The blue-spotted grouper breeds in the south China coast in June and July. The spawning water temperature ranges from 21.4 to 24.5°C, and the proportion of seawater is 1.017 to 1.021. Grouper is a degenerative fish, male and female is changing with the individual's growth. The adult fish lay eggs for the female first, and it only turns into a male body when they grow to 1.5kg or more.
Growth According to the observation of the culture experiment, one case of growth of blue grouper was: spawning in July. The juveniles were bred to a weight of about 15 grams in November, up to 20 grams for individual ones, and bred for 90 days in November of the following year. Around, the big up to 160 grams.
The fish caught in the sea area was 139 kg on July 7th, and 274 kg was caught on the farm until November 26. The rate of weight gain was 97.1%, and the feed coefficient was 9.8.
Farming techniques and management measures Selection of fry. At present, grouper breeding has not yet reached the productive requirements, so the cultured fish are still using juvenile fish caught in the natural sea area for the development of fry. Farmed grouper juveniles are best caught by hand-fishing. When choosing, you must pay attention to the quality of the fish. Should choose a strong fish, strong vitality, disease-free, no scale damage, good skin color and luster for breeding.
Stocking specifications and density The stocking densities have a large relationship with the flow rate in the aquaculture sea area. The sea area with smooth flow may be larger, but less. In a cage of 333 (m) in general, about 2,500 tails can be put in each box with 50 g/tail of stocked fish size, and about 1000 tails per carton with a specification of 150 g/head or less. In other words, a 333-meter (m) cage culture yield of about 200 kg is more appropriate.
The general principle of feeding and feeding is that the small tides flow slowly and clear, and when the water temperature is appropriate, it is more likely to vote, but less to vote. The daily feeding amount is generally about 8% of the fish's body weight. When feeding, it is necessary to put in a small amount first. When the fish come to snatch food, it is slowly put in batches until the fish food is no longer enough to snatch food on the water. Because the grouper eats by swallowing, the individual size of the bait is smaller than the size of the fish.
When stocking rearing fish species, they should be rearranged according to the size of the fish body. From the theoretical analysis, the smaller the individual differences, the better, but the actual operation is more difficult to do. Due to the small size difference of fish, feeding is even, which is conducive to growth.
In the daily management and culture process, in addition to feeding, observations of fish growth, food intake, activities, and body color are often observed, and the cages are often inspected for damage and the number of attached organisms. For timely processing. Strengthen anti-wind measures to ensure safe production.
Life habits and growth analysis According to tests, when the grouper is between 22-30°C, the fish is active, has a large food intake, and grows fast; when the water temperature drops below 22°C and below 19°C, the water temperature drops to 19 Below °C, the food consumption decreased significantly, the growth rate slowed down, and the activity decreased with the decrease of water temperature. It was also observed when the indoor pool was overwintering. The water temperature dropped below 10°C and no predation of dead baits, but live crustaceans. Can still choose to eat; when the water temperature drops below 7.5 °C, stop feeding, the fish is in a static state; when the water temperature is lower than 5.5 °C, there will be death.
Groupers have a wide range of adaptation to salinity, and they can survive between 11 ‰ and 41 ,, with a maximum of 30 最.
The breeding season for various grouper species varies, even though the same grouper species also differ from place to place. The blue-spotted grouper breeds in the south China coast in June and July. The spawning water temperature ranges from 21.4 to 24.5°C, and the proportion of seawater is 1.017 to 1.021. Grouper is a degenerative fish, male and female is changing with the individual's growth. The adult fish lay eggs for the female first, and it only turns into a male body when they grow to 1.5kg or more.
Growth According to the observation of the culture experiment, one case of growth of blue grouper was: spawning in July. The juveniles were bred to a weight of about 15 grams in November, up to 20 grams for individual ones, and bred for 90 days in November of the following year. Around, the big up to 160 grams.
The fish caught in the sea area was 139 kg on July 7th, and 274 kg was caught on the farm until November 26. The rate of weight gain was 97.1%, and the feed coefficient was 9.8.
Farming techniques and management measures Selection of fry. At present, grouper breeding has not yet reached the productive requirements, so the cultured fish are still using juvenile fish caught in the natural sea area for the development of fry. Farmed grouper juveniles are best caught by hand-fishing. When choosing, you must pay attention to the quality of the fish. Should choose a strong fish, strong vitality, disease-free, no scale damage, good skin color and luster for breeding.
Stocking specifications and density The stocking densities have a large relationship with the flow rate in the aquaculture sea area. The sea area with smooth flow may be larger, but less. In a cage of 333 (m) in general, about 2,500 tails can be put in each box with 50 g/tail of stocked fish size, and about 1000 tails per carton with a specification of 150 g/head or less. In other words, a 333-meter (m) cage culture yield of about 200 kg is more appropriate.
The general principle of feeding and feeding is that the small tides flow slowly and clear, and when the water temperature is appropriate, it is more likely to vote, but less to vote. The daily feeding amount is generally about 8% of the fish's body weight. When feeding, it is necessary to put in a small amount first. When the fish come to snatch food, it is slowly put in batches until the fish food is no longer enough to snatch food on the water. Because the grouper eats by swallowing, the individual size of the bait is smaller than the size of the fish.
When stocking rearing fish species, they should be rearranged according to the size of the fish body. From the theoretical analysis, the smaller the individual differences, the better, but the actual operation is more difficult to do. Due to the small size difference of fish, feeding is even, which is conducive to growth.
In the daily management and culture process, in addition to feeding, observations of fish growth, food intake, activities, and body color are often observed, and the cages are often inspected for damage and the number of attached organisms. For timely processing. Strengthen anti-wind measures to ensure safe production.
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