The red snapper, commonly known as the American redfish, was widely distributed in the tropical oceans of the Indian Ocean and the Pacific Ocean. It is characterized by large individuals, high yields, delicate meat quality, and good economic returns. It is a fine new species introduced by the coastal sea Cage aquaculture industry in Fujian Province, especially in Pingtan County. In order to further promote and develop sea cage culture, the main points of its breeding technology are summarized below.
First, living habits
The blubber is a bony fish, a subclass of the radial fins (Euroididae), an oyster-shaped head, a suborder of the Oystercatcher, a sardinidae, and a genus Snapper. Its scales on the upper and lower sides of the body surface are obliquely posterior. The dorsal ray base area is larger than the fins, and the fins are slightly rounded at the trailing edge. The body surface is red and the abdomen is light red. It is called "American redfish" or "red fish." It inhabits water depths of 30 to 100 meters, and its bottom is mud, silt, sand, shells, and rocky reefs. Each year from March to May, the colony breeds. In April, the number of eggs laid by individuals can reach 1 million to 1.7 million grains. Sexuality likes to move vertically, dusk and early mornings are common habitats, and during the day and at night, it often floats in the middle and upper layers. When breeding season, it swims from the deep sea to the shallow sea and then returns to the deep sea to feed for food after spawning.
Second, the technical aspects of cage culture
Red-and-white snapper cage culture is generally the same as the cage culture method of the true bream (abbreviated), but there are also fundamentally different methods for them, especially the technical aspects of the rearing process.
1. Strict water temperature requirements
Water temperature is very closely related to the success or failure of red snapper breeding, and it is the main factor that determines the metabolism, growth rate and food intake of the hot water snapper. Because the optimum temperature range of the snapper is 8 °C to 33 °C, and the optimum temperature is 23 °C to 29 °C, the red snapper grows fastest from August to November every year. Higher water temperature, but above 3rd-age fish, it is biased to slightly lower water temperature), only the over-water fish has a low water temperature limit of 8°C. For this reason, the predicted water temperature for selecting the old and new breeding sea areas must not be lower than 8°C, otherwise it cannot be overwintering and it is not conducive to breeding. From the practice of breeding in recent years, the water temperature is below 20°C and fish growth is slow, while the water temperature between 25°C and 30°C can increase the average of 250g to 350g per month for more than 100g per month, and over 350g for juvenile fish. Young fish can grow by an average of 150 grams per month.
2. Seedling source and market
The fingerling of the red snapper is derived from Taiwan's artificial propagation seedlings. It is introduced from Taiwan from mid-May to June each year, and the 3.5 cm to 5 cm fish seedlings are sold at a price of 3 yuan per tail. Under normal growth conditions, carefully bred until the Spring Festival that year, the weight can reach 350 grams to 400 grams, which is the Hong Kong people's favorite food to rush to sell goods, up to 50 yuan to 60 yuan per kilogram. Such as the development of more than 500 grams of finished fish, sales in Taiwan, the price per kilogram of more than 60 yuan, the current export market is optimistic.
3. Scientific feeding management
(1) Grab the fish fry. The red snapper seedlings that have just been purchased are first raised for a week or so, and after their physical strength returns to normal, they are washed with fresh water for 5 minutes to 10 minutes and the fish fry quickly picked up and placed in a pre-processed canvas small cage. One ton of fresh water is poured into the box, allowing the fish to swim freely for 10 minutes before being fed into a new cage. Fry just thrown into the cage, adhere to freshwater dipping once every 5 days, until the fry growth weight of 150 grams to 250 grams, and then dip for another half a month, followed by a fish when the body weight of more than 300 grams, as long as 1 to 2 months dip once on the line. In the operation of the above-mentioned dipped fish body, the operation must be performed quickly and carefully, and care must be taken with care. The mechanical damage is strictly prohibited to prevent the occurrence of disease.
(2) Strengthen daily observation. The first is to observe the fish's swimming situation. Normally, the fish body makes regular swimming around the cage and does not produce panic; if the fish is found to be mad or chaotic, it should be immediately analyzed to understand why. , take effective measures in time. The second is to observe the mucus and color of the surimi. If abnormal diseases are found, timely treatment should be done.
(3) Keep the bait off. It is mainly fed with fresh small fish, but it must be chopped by a bait feeder, and it should be fed twice or three times a day (morning, evening or night). During the fresh season, the fresh seasoned bait is not fed. Feed the fish thoroughly to thaw the bait and clean it with fresh water or seawater. Mix the yeast chips or glucose powder. For example, 15 kg bait and 30 g to 50 g yeast chips (about 100 to 150 tablets) ), Or 25 kg of bait plus 1 kg of glucose powder. It is forbidden to feed frozen sea mud loach because of its high oil content, indigestible, easy to oil after eating fish, and suffering from enteritis disease. In short, to properly regulate the total amount of bait, according to various natural conditions, water ecological characteristics, population composition and intensive degree and other indicators, the implementation of comprehensive control of animal nutrition methods, thereby replacing the so-called full-price bait of the concept of the concept of qualitative. To achieve the goal of maintaining the overall ecological balance, ensure healthy growth, and obtain sustainable development with high yields and stable production (as for the specific amount of feed to be fed is basically the same as feeding in real cages).
First, living habits
The blubber is a bony fish, a subclass of the radial fins (Euroididae), an oyster-shaped head, a suborder of the Oystercatcher, a sardinidae, and a genus Snapper. Its scales on the upper and lower sides of the body surface are obliquely posterior. The dorsal ray base area is larger than the fins, and the fins are slightly rounded at the trailing edge. The body surface is red and the abdomen is light red. It is called "American redfish" or "red fish." It inhabits water depths of 30 to 100 meters, and its bottom is mud, silt, sand, shells, and rocky reefs. Each year from March to May, the colony breeds. In April, the number of eggs laid by individuals can reach 1 million to 1.7 million grains. Sexuality likes to move vertically, dusk and early mornings are common habitats, and during the day and at night, it often floats in the middle and upper layers. When breeding season, it swims from the deep sea to the shallow sea and then returns to the deep sea to feed for food after spawning.
Second, the technical aspects of cage culture
Red-and-white snapper cage culture is generally the same as the cage culture method of the true bream (abbreviated), but there are also fundamentally different methods for them, especially the technical aspects of the rearing process.
1. Strict water temperature requirements
Water temperature is very closely related to the success or failure of red snapper breeding, and it is the main factor that determines the metabolism, growth rate and food intake of the hot water snapper. Because the optimum temperature range of the snapper is 8 °C to 33 °C, and the optimum temperature is 23 °C to 29 °C, the red snapper grows fastest from August to November every year. Higher water temperature, but above 3rd-age fish, it is biased to slightly lower water temperature), only the over-water fish has a low water temperature limit of 8°C. For this reason, the predicted water temperature for selecting the old and new breeding sea areas must not be lower than 8°C, otherwise it cannot be overwintering and it is not conducive to breeding. From the practice of breeding in recent years, the water temperature is below 20°C and fish growth is slow, while the water temperature between 25°C and 30°C can increase the average of 250g to 350g per month for more than 100g per month, and over 350g for juvenile fish. Young fish can grow by an average of 150 grams per month.
2. Seedling source and market
The fingerling of the red snapper is derived from Taiwan's artificial propagation seedlings. It is introduced from Taiwan from mid-May to June each year, and the 3.5 cm to 5 cm fish seedlings are sold at a price of 3 yuan per tail. Under normal growth conditions, carefully bred until the Spring Festival that year, the weight can reach 350 grams to 400 grams, which is the Hong Kong people's favorite food to rush to sell goods, up to 50 yuan to 60 yuan per kilogram. Such as the development of more than 500 grams of finished fish, sales in Taiwan, the price per kilogram of more than 60 yuan, the current export market is optimistic.
3. Scientific feeding management
(1) Grab the fish fry. The red snapper seedlings that have just been purchased are first raised for a week or so, and after their physical strength returns to normal, they are washed with fresh water for 5 minutes to 10 minutes and the fish fry quickly picked up and placed in a pre-processed canvas small cage. One ton of fresh water is poured into the box, allowing the fish to swim freely for 10 minutes before being fed into a new cage. Fry just thrown into the cage, adhere to freshwater dipping once every 5 days, until the fry growth weight of 150 grams to 250 grams, and then dip for another half a month, followed by a fish when the body weight of more than 300 grams, as long as 1 to 2 months dip once on the line. In the operation of the above-mentioned dipped fish body, the operation must be performed quickly and carefully, and care must be taken with care. The mechanical damage is strictly prohibited to prevent the occurrence of disease.
(2) Strengthen daily observation. The first is to observe the fish's swimming situation. Normally, the fish body makes regular swimming around the cage and does not produce panic; if the fish is found to be mad or chaotic, it should be immediately analyzed to understand why. , take effective measures in time. The second is to observe the mucus and color of the surimi. If abnormal diseases are found, timely treatment should be done.
(3) Keep the bait off. It is mainly fed with fresh small fish, but it must be chopped by a bait feeder, and it should be fed twice or three times a day (morning, evening or night). During the fresh season, the fresh seasoned bait is not fed. Feed the fish thoroughly to thaw the bait and clean it with fresh water or seawater. Mix the yeast chips or glucose powder. For example, 15 kg bait and 30 g to 50 g yeast chips (about 100 to 150 tablets) ), Or 25 kg of bait plus 1 kg of glucose powder. It is forbidden to feed frozen sea mud loach because of its high oil content, indigestible, easy to oil after eating fish, and suffering from enteritis disease. In short, to properly regulate the total amount of bait, according to various natural conditions, water ecological characteristics, population composition and intensive degree and other indicators, the implementation of comprehensive control of animal nutrition methods, thereby replacing the so-called full-price bait of the concept of the concept of qualitative. To achieve the goal of maintaining the overall ecological balance, ensure healthy growth, and obtain sustainable development with high yields and stable production (as for the specific amount of feed to be fed is basically the same as feeding in real cages).
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