Gourd breeding and breeding techniques

The horny scorpionfish is a member of the genus Grylloporus, which is commonly known as scorpionfish. The fishermen in the coastal areas of Fujian and Guangdong are commonly known as quails. They can weigh up to 25 kg to 30 kg. They are delicious in meat and have medicinal value. They are popular in the international market. . Cage cultured scallops have the advantages of rapid growth and strong disease resistance. They were stocked with artificial fry in the coastal areas of Fujian and Guangdong. After 189 days of cage culture, the maximum weight was 1.15 kg. Up to 1.65 kg, the survival rate reached 93.4%. First, the broodstock intensive care? The cultivation of broodstock fish is not the same as the cultivation of adult fish, and the cultivation of high-quality broodstock must be carefully maintained. The density of stocking broodstock is controlled within one tail/m3 to 1.5 tail/m3 so that the broodstock has enough space for movement. The feed quality and daily food intake of broodstock are very important. Blue radishes, golden sardines, dogfishes, and horse mackerel have to be used as daily feed for broodstock. From April to November when the water temperature is between 18°C ​​and 30.5°C, the broodstock will consume between 12% and 16% of body weight and will be fed once in the morning and evening. From December to March of the following year, when the water temperature is 6°C to 17°C, the broodstock will consume 2% to 12% of body weight and be fed once or twice a day. The antenatal intensive period is from October to April of each year, and the spawning and post-natal intensive period are from May to June. During the intensive culture, the fresh and frozen blue round squid is the main feed, supplemented by gold small sardines, and the feed is not fed. Add vitamin E and complex vitamin B to feed every week. Change the net regularly to ensure smooth flow of cages. During winter, the parasite's parasites are checked and prevented, so that broodstock during the wintering period and before spawning are not affected, so as not to affect the development of gonads. Second, oxytocin production and natural spawning broodstock cage set inside the oyster production cage, cage depth of 2 meters, urine production cage area depending on the size of feeding broodstock. When the water temperature was stable above 18°C, and the broodstock was observed swimming in the middle and upper layers day and night, when the male fish issued a "chirping" chicken roar, artificial cages could be produced manually. The broodstock with well-developed selective glands and enlarged abdomen serves as the object of oxytocin production. The ratio of male to female is 1:1, and the broodstock has a density of 0.5 fish/m3. The oxytocicants were formulated with LHRH-A and HCG mixed hormone plus vitamin B12 and vitamin C injection. Female fish injection dose: LHRH-A12 micrograms / kg of fish ~ 18 micrograms / kg of fish and HCG120IU / kg of fish ~ 180IU / kg of fish, male fish halved, one-time injection of back muscle, injection time from 16 to 18 hours. Cage production is different from indoor oxytocin production. It is necessary to select the broodstock for raising the productivity and fertilization rate of the cage. The gonads with hypogonadism do not produce. To master the dose of sex hormones, the dose affects the fertilization rate, and the dose less affects the productivity. Water temperature is the main factor affecting the time of sex hormone effect. The water temperature for early production is not stable, and special attention should be paid to the fact that bad weather can not be produced when the water temperature drops. Natural spawning can be achieved 36 to 40 hours after the injection of oxytocin. During the production period, the broodstock should be prevented from being deprived of oxygen due to poor clogging of the cage mesh. Therefore, the urine production cage should be kept clean and equipped with pump flushing facilities. The luminosity of the production cage network environment should be kept within 100 lx. Nighttime flashlights or walking around the cage can also disturb the broodstock chase and spawning. After spawning is discovered, sperm can not be rushed to collect eggs, so as not to affect the spawning effect. The broodstock chased from estrus to the end of spawning about 120 minutes, of which chasing time accounted for about 2/3 or more. Before the spawning, the male chased strongly and issued a short “chicken roar”. The head of the male fish topped the female tail to the surface of the water. At this time, the female's tail was often heard to beat the surface of the water. Once spawning began, the male and female fish slowed down, and the urine hole was close by and the head was heading in the same direction, completing the natural spawning process for about 20 minutes to 35 minutes. The fertilized eggs in the production cage float on the upper layer of the water, while the non-fertilized eggs sink on the middle and lower layers, but some of the non-fertilized eggs float to the upper layer of the cage due to the movement of the broodstock. If urine is affected by rain, the seawater salinity decreases, the fertilized egg floats, and fertilized eggs often mix with unfertilized eggs. The collection and transportation of fertilized eggs must be pre-configured with seawater with a salinity of 33 ‰ to 34 ,. As the water for egg collection and transportation, the fertilized eggs become buoyant. The net of the fertilized eggs was made using a 60 mesh nylon sieve. The fertilized egg is loaded into a double plastic oxygen bag and transported after inflation. The egg filling amount is 120 g/bag to 140 g/bag, and the survival rate is 95% or more after transportation for 4 hours to 5 hours. 3. Incubation of hatchery, juvenile fish, and juvenile fish After fertilized eggs are transported to the nursery, seawater with a salinity of 33 to 34 ‰ is reconstituted, and dead eggs are removed, at a rate of 100,000 to 200,000 grains/m3. Density of the fertilized eggs hatch into the hatching pool, the use of micro-inflated water, hatching sea salinity of 25 to 30 ‰. 1. Cement pond rearing The larvae are put in the cement pond after being filmed. Chlorella access was obtained at a concentration of (50-60) 104/l. Early larval rearing density of larvae ranges from 0.500 to 10,000/m3, and the amount of water exchanged per day is 1/5 to 1/3. The post-cultivation density was 0.3 million to 35,000 tails/cubic meters, and the amount of water exchanged once per day increased from 1/3 to 1/2. Seawater pH value 7.5 ~ 8.2, dissolved oxygen above 5.5 mg / liter, pool water transparency 30 cm ~ 40 cm. The series of bait species are: Brachionus plicatilis enhanced by Chlorella, Artemia nauplii, and copepods. 2. Soil pond nursery juveniles 13 mm to 15 mm in length can be moved to outdoor soil ponds for cultivation. The area of ​​earthen ponds should not exceed 10 acres. Prior to planting seedlings, clearing pond disinfection, influent water filtration, and fertilizer and water cultivation were used to cultivate natural biofeeds. When the seedlings are released, choose a windless sunny day sooner or later. The seedlings were placed on the edge of the pool facing the shelter from the north to the south, and the oyster pulp was fed once every 2 to 3 hours after the seedlings were placed. The seeds were fed without feeding at night, and the lamp was used as a supplementary feed. After 3 days to 4 days, they were fed once every 4 to 5 hours. The oyster pulp and blue round ginseng minced meat were fed with young foals, and they were fed with fresh water and mixed into pellets. After 10 days to 15 days, they were fed once a day in the morning, midnight, and evening. The amount of feed increased and the duration of feeding was extended. Intake water once a day, change the water volume 20 cm to 30 cm. (Yang Wei)