First, broodstock intensive
The cultivation of the broodstock of the fish from the scorpionfish is not the same as the cultivation of the adult fish, and the cultivation of the broodstock must be meticulously nurtured. The density of stocking broodstock is controlled within 1 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 18Â°C â€‹â€‹and 30.5Â°C, the broodstock will consume between 12% and 16% of body weight, and will be fed once and twice a day. From December to March of the following year, when the water temperature is 6Â°C-17Â°C, the broodstock will consume 2%-12% of body weight and be fed once or twice a day. Every year from October to April of the following year is the prenatal intensive period, May to June is the period of spawning and postnatal intensive breeding. 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 and natural spawning
The broodstock cages are raised inside the broodstock cages. The depth of the cage is 2 meters. The area of â€‹â€‹the urine production cages depends on the size of the bred broodstock. When the water temperature was stable above 18Â°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, a one-time injection of the 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 injecting 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 â€œchicken roarâ€. 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. Egg volume 120g/bag -140g/bag, transport 4 hours -5 hours, the survival rate of more than 95%.
Third, hatching and breeding of juvenile and juvenile fish
After the fertilized eggs are transported to the nursery, the seawater with a salinity of 33â€°-34â€° is reconstituted, the dead eggs are removed, and the fertilized eggs are hatched at a density of 100,000 tablets/m3â€“200,000 tablets/m3. Using aerated micro-flowing water, the hatched seawater has a salinity of 25 â€° -30 â€°.
1. Cement pond nursery
After the larvae are filmed, they are placed in a concrete pool for cultivation. Chlorella access was obtained at a concentration of (50-60) 104/l. Early larval rearing density is 0.5 to 50 thousand/m3 - 10 thousand/m3, and the amount of water changed once a day is 1/5-1/3. The post-cultivation density was 0.3 million/m3 to 0.500/m3, and the amount of water exchanged once per day increased from 1/3 to 1/2. Seawater pH 7.5-8.2, dissolved oxygen 5.5 mg / liter or more, pool water transparency 30 cm -40 cm. The series of bait species are: Brachionus plicatilis enhanced by Chlorella, Artemia nauplii, and copepods.
2. Earthen pond nursery
Juveniles with a total length of 13 mm to 15 mm can be moved to an outdoor earth pond for cultivation. The area of â€‹â€‹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 side of the pool facing the shelter from the north to the south, and the oyster pulp was fed once every 2 hours to 3 hours after the seedlings were laid, and the larvae were fed without feeding at night. After 3 days to 4 days, feeding was conducted once every 4 hours to 5 hours. The oyster pulp and blue round ginseng minced meat were added to the feed of the young quail and mixed with fresh water. After 10 days to 15 days, they were fed once a day in the morning, in the evening, and then in the evening. The amount of feed was increased and the feeding time was extended. Water 1 time per day, change the amount of water 20 cm -30 cm.
A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. Many hormones are secreted by special glands, such as thyroid hormone produced by the thyroid gland. Hormones are essential for every activity of life, including the processes of digestion, metabolism, growth, reproduction, and mood control. Many hormones, such as neurotransmitters, are active in more than one physical process.
Pertaining to hormones and the glands that make and secrete them into the bloodstream through which they travel to affect distant organs. The endocrine sites include the hypothalamus, pituitary gland, pineal gland, thyroid, parathyroids, heart (which makes atrial-natriuretic peptide), the stomach and intestines, islets of Langerhans in the pancreas, the adrenal glands, the kidney (which makes renin, erythropoietin, and calcitriol), fat cells (which make leptin). the testes, the ovarian follicle (estrogens) and the corpus luteum in the ovary). Endocrine is as opposed to exocrine. (The exocrine glands include the salivary glands, sweat glands and glands within the gastrointestinal tract.)
*Related Products:hormone drugs,endocrine drugs,urinary drugs.
Oxytocin Injection,Conjugated Estrogens,Levonorgestrel Drug, Dexamethasone Tablets
NOUVASANT PHARMhealth LTD. , http://www.nouvasant.com