Sensory Cortex,Occipital Cortex,The Frontal Cortex,Periamygdaloid Cortex Henan Qiancuntang medicial technology co.ltd. , https://www.qctchineseherb.com
1. The dietary oysters live on the water layer, and they eat phytoplankton and eat a small amount of zooplankton. The rotifers are open live bait cultivated by the fish ponds, and they also like to eat rotifer-sized other artificial concentrates such as soybean milk. With the continuous growth of fry, after the summer flowering stage, the earthworms grow basically and gradually become filter-feeding phytoplankton. Fertilizing through ponds and cultivating water quality can make maggots grow well, and all stages of growth prefer to eat all kinds of powder. Artificial fine feed.
2. Growth é²¢ is a large economic fish that grows fast. The sexually mature age is 34 years (Yangtze River Basin). The weight gain was the fastest in 36 years and later slowed down; the body length growth was faster at 14 years and slower at the fourth age.
3, breeding quail belongs to river fish. Under natural conditions, the major rivers in China mainly have their spawning grounds. In the spawning season, broodstock can swim to spawning grounds for egg production. However, under artificial pool conditions, they cannot.
Sexual maturation age and individual size are closely related to latitude (heat). In southern China, the sexual maturity is 243 years old and the body weight is about 2kg. In central China, the sexual maturity is 34 years old and the body weight is about 3kg. In the northeast, the sexual maturity is 56 years old and the body weight is about 5kg. In addition, sexual maturation is also related to nutritional conditions, nutrition is different, sexual maturity age and weight will also be different. Males are also generally 1 year older than females and individuals are smaller than females.
Second, artificial breeding
1. The selection of broodstock to select qualified broodstock with good germplasm and physical constitution is one of the basic conditions for artificial breeding of grass carp. The so-called good germplasm, that is, according to China's "Sanjiang" (Yangtze River, Pearl River, Heilongjiang) "four major fish" germplasm study, the best in the Yangtze River germplasm, so the choice of the original species of the Yangtze River grass carp is more ideal. The so-called good constitution, that is, a sturdy fish body, normal body color, scales intact, no injury, disease-free individuals. Undeveloped mature individuals, as reserve broodstock, mature individuals, use broodstock as production. In the selection of broodstock, attention should also be paid to male and female collocations, with males being slightly more common than females.
2, broodstock breeding (1) broodstock cultivation pool. The area of ​​broodstock ponds is 2/154/15hm2 (24 mu) with a water depth of 1.52.5m. The location is near the urine production basin, convenient drainage and quiet environment. Lime clear pond before stocking.
(2) Stocking density. Each hectare of pond stocking broodstock is about 15002250kg. The ratio of male to female is 1:1 or 1:1.25. In order to fully utilize the bait and adjust the water quality, under the premise of grass broodstock breeding, 5060 broodstock broodstock or broodstock can be reared in each hectare, and the broodstock broodstock and blue broodstock or their broodstock are each about 30 or so. 30 or so.
(3) feed. The natural bait of the broodstock is mainly phytoplankton. Fertilizing through the pond and cultivating the water can make it grow well. The quail also eats all kinds of concentrated feed. In order to enhance the physique, it is appropriate to increase the part of the broodstock in the postpartum, autumn and early spring. Bran and oyster concentrates are good for gonadal development.
3, brood fish production (1) production time, water temperature: in the middle and lower reaches of the Yangtze River, urine production time is 56 months, urine production temperature 24 ~ 26 °C main and most suitable.
(2) Broodstock sorting: The maturity of the broodstock directly influences the oxytocin production effect. The identification criteria is that the male fish has a semen out of the abdomen by pressing lightly. It immediately spreads out after encountering water. The abdomen of the female fish is enlarged, soft and elastic, and the abdominal scales are sparse. In order to improve the maturity of the population, the network can be checked in mid-April. For poor maturity, according to individual size and maturity, according to individual size and maturity, LRH-A3 ~ 5 micrograms/tail were injected.
4, estrus and artificial insemination water temperature above 18 °C can be aphrodisiac, the best water temperature is 22 ~ 26 °C. The oxytocin is injected 1 to 2 times, and the interval between 6 injections is 6 to 12 hours. The time from the last injection to ovulation is usually 9 to 12 hours. The broodstock chase after the estrus in the spawning pool for a predetermined period of time. The males constantly use their heads to hit the female's abdomen and rub against each other. The females tend to twist and lean each other, vibrate the pectoral fins from time to time, ovulate ejaculates, and cooperate closely. It is advisable to take the eggs one hour after spawning. Artificial insemination techniques can also be used.
5. Incubation Artificial incubation is to place the fertilized eggs in hatchery tools and hatch the fry under artificially managed conditions. All rivers, lakes and ponds can be used for hatching water. Tap water that is considered safe after exposure to chlorine or sodium thiosulfate is also sometimes used. The temperature of the incubation water must be relatively stable, and it should be graded (40 mesh, 60 mesh, 80 mesh) stepwise through the filter tank or filter gate. Incubation kits include incubators, hatching tanks, hatching tanks, hatching circuits, hatching tanks, and plastic incubators. They must be selected according to local conditions. Incubation time varies with water temperature. After hatching for 3 to 5 days, the fry larvae have been inflated, and the yolk sac has basically disappeared. When they can take the initiative to feed, they can emerge. The box holding training, so that the fry solid, reduce excretion. When changing the water on the way or reaching the destination pond, the difference in water temperature cannot exceed 4°C.
Third, seed cultivation
1. Cultivate (1) pond conditions: The area of ​​the grass carp seedling culture pond is 1/15hm2, the depth of the pool is about 1 meter, the bottom of the pool is flat, and there is less sludge (about 5 centimeters). Adequate water supply, drainage and irrigation are convenient, and the embankment is not leaking.
(2) Stocking density of fry: 2.23 million tails per hectare.
(3) Stocking of fingerlings: earthworms account for 60% 65%, polyculture grasshoppers 10%, grass carp 30%; or polyculture turtles 10%, carp 20%, grass carp 10%; or polyculture carp 15%, grass carp 20%; Or mixed with herring 35% 40%.
(4) Feeding techniques and feeding amount The carp has a nocturnal feeding habit, paying particular attention to increasing the amount of feeding at night between 11 and 12 hours. When the length of the fish is 10-16 cm, the amount of feeding is 6%-10% of the total amount of the fish, and when the body length is longer than 16 cm, the amount of feeding is 3%-5%. Feeding should be timed, positioned, qualitative and quantitative.
Trout culture technology
I. Ecological habits