The scorpion scorpion is commonly known as the scorpion-shaped peony, and the peony is a peony. Its delicate meat, delicious taste, strong adaptability, rapid growth and other advantages, is another new and excellent breeding breed of sea cage breeding in Raoping County. The natural seedling resources of this species are in short supply and can not meet the needs of the development of cage culture. From 1998 to 2000, Raoping County conducted a research on the artificial breeding of Hua Duo pepper pods and achieved gratifying results. In the past three years, a total of 76.4 million larvae have been cultivated and 8.23 ​​million 2-3 million fishes have been reared to reach the level of mass production. The artificial seedling technology of Huafeng pepper is introduced as follows:
First, the source and selection of broodstock
More than one month before the breeding season (April to May of each year), adult fish raised in wild broodstock or cages in the sea area of ​​Raoping County are selected and weighed at 1.5 kg, more than three years of age, robust and intact, and well-surfaced. As a broodstock for intensive cultivation. Females should be enlarged and soft in the abdomen, and the anus should be ruddy; males should have white semen out of light pressure.
Second, oxytocin
The broodstock can be administered by single or mixed injection of human chorionic gonadotropin and ovulating ovulation hormone No.2. After injection, male and female broodstock are stocked in a proportion of 1-1.5:1 in 30-40 cubic meters of cement pool or 3 meters, 4 meters, and 3 meters. The cage lays eggs.
Third, fertilization and incubation
After spawning, natural spawning and fertilization are performed. The fertilized eggs were moved into the indoor 621.5 cubic meter hatchery pool and were statically micro-inflated. The hatching density is 10-150000 grains/m3. During incubation, the water temperature is 20-25°C, the specific gravity of seawater is 1.018-1.023, and the pH is 8.0-8.4. After 36-48 hours of hatching larvae. IV. Indoor cultivation of larvae
The seedling density of larvae is controlled at 8-100,000/m3, and the water temperature during incubation is 19-25°C, the specific gravity is 10.10-1.021, and the pH value is 8-8.4. Continuous micro-inflation, usually after 3 days of open feeding, with rotifers as the open bait, feeding amount of 8-12/ml, feeding twice a day, so that the amount of rotifers in the nursery water body is kept at 4/ml the above. The cultivation pond needs to cast a small amount of chlorella, so that the water of the nursery is pale green to purify the water and increase the nutrition of the rotifer.
V. Earthen pond cultivation
The outdoor earth ponds are cultivated using a combination of fertilizer-feeding bait feed and feeding. General pond water depth 1.2-2.0 meters, until the pool of food organisms multiply, the test water is not toxic, you can invest in larvae have been open for 5-8 days, stocking density of 10-150000 / acre. In the initial stage of earth pond cultivation, soy flour and carp bait powder are fed. When the fish is more than 0.8 cm long, freshwater cladocera, Artemia larvae, and copepods are fed. When the fry reaches 1.5 cm or more, they can be cast. Feed fresh fish.
Sixth, the result
1. Development of gonads in broodstock In the three years, 1280 broodstock were bred in total, including 740 females and 540 males. In 1998, 120 broodstock were cultivated for the 3rd instar, of which 82 were females and females were examined on May 10. Tail mature, maturity rate 50%.
In 1999, 250 broodstock of 3-4 instars were bred, of which 130 were females, and 84 were matured. The maturation rate was 65%. In 2000, 910 broodstock were reared, including 520 females and a maturity rate of 80%.
2. The results of oxytocin production In the past three years, a total of 591 broodstock were spawned and 235 kg eggs were spawned. A total of 91 kg of fertilized eggs were obtained, and the average fertilization rate was 39%.
3. Incubation and indoor incubation In the past three years, 88.9 million larvae have been hatched. After 8-10 days of indoor cultivation, a total of 76.4 million tailed seedlings (opening 5-8 days of larvae) were bred. The average survival rate was 86%.
4. The results of seedling raising in the earthen ponds for three years have reached an area of ​​650 mu. The opening seedlings have been placed at 6,940 tails, and 8.23 ​​million fry 2–3 cm fishes have been produced. The average survival rate is 11.9%.
VII. Discussion
1. Artificial seedlings of P. acerifolia are bred using wild broodstock or cages. After artificially intensified breeding, they can promote gonad maturation and meet the requirements of oxytocin production. And the broodstock can be enhanced by raising the maturation rate of the broodstock. For example, if the broodstock was not intensively cultivated in 1998, the maturation rate is only 50%. In 1999 and 2000, the broodstock was intensively cultivated, and the maturity rate reached 65% and 80% respectively.
2. The calyx is a mature and batch-spawned fish. From the analysis of the broodstock's anatomy, oxytocin production and climatic conditions, the evacuation period in the coastal area of ​​Guangdong is suitable from the early April to the end of May.
3. In the process of artificial oxytocin production, the development of male gonads is slower than that of females, and the gonads of males have a longer maturation period, which leads to a low fertilization rate during ovulation. How to increase the fertilization rate needs further exploration.
4. Through three years of research on the artificial breeding of H. lanuginosa, the successes of artificial oxytocin, food culture, and fry cultivation have been achieved. The artificial seedlings of this species have now reached the level of mass production. By 2000, the survival rate of outdoor soil seedlings had stabilized at between 6.6 and 15%, and the highest survival rate was 40%.
First, the source and selection of broodstock
More than one month before the breeding season (April to May of each year), adult fish raised in wild broodstock or cages in the sea area of ​​Raoping County are selected and weighed at 1.5 kg, more than three years of age, robust and intact, and well-surfaced. As a broodstock for intensive cultivation. Females should be enlarged and soft in the abdomen, and the anus should be ruddy; males should have white semen out of light pressure.
Second, oxytocin
The broodstock can be administered by single or mixed injection of human chorionic gonadotropin and ovulating ovulation hormone No.2. After injection, male and female broodstock are stocked in a proportion of 1-1.5:1 in 30-40 cubic meters of cement pool or 3 meters, 4 meters, and 3 meters. The cage lays eggs.
Third, fertilization and incubation
After spawning, natural spawning and fertilization are performed. The fertilized eggs were moved into the indoor 621.5 cubic meter hatchery pool and were statically micro-inflated. The hatching density is 10-150000 grains/m3. During incubation, the water temperature is 20-25°C, the specific gravity of seawater is 1.018-1.023, and the pH is 8.0-8.4. After 36-48 hours of hatching larvae. IV. Indoor cultivation of larvae
The seedling density of larvae is controlled at 8-100,000/m3, and the water temperature during incubation is 19-25°C, the specific gravity is 10.10-1.021, and the pH value is 8-8.4. Continuous micro-inflation, usually after 3 days of open feeding, with rotifers as the open bait, feeding amount of 8-12/ml, feeding twice a day, so that the amount of rotifers in the nursery water body is kept at 4/ml the above. The cultivation pond needs to cast a small amount of chlorella, so that the water of the nursery is pale green to purify the water and increase the nutrition of the rotifer.
V. Earthen pond cultivation
The outdoor earth ponds are cultivated using a combination of fertilizer-feeding bait feed and feeding. General pond water depth 1.2-2.0 meters, until the pool of food organisms multiply, the test water is not toxic, you can invest in larvae have been open for 5-8 days, stocking density of 10-150000 / acre. In the initial stage of earth pond cultivation, soy flour and carp bait powder are fed. When the fish is more than 0.8 cm long, freshwater cladocera, Artemia larvae, and copepods are fed. When the fry reaches 1.5 cm or more, they can be cast. Feed fresh fish.
Sixth, the result
1. Development of gonads in broodstock In the three years, 1280 broodstock were bred in total, including 740 females and 540 males. In 1998, 120 broodstock were cultivated for the 3rd instar, of which 82 were females and females were examined on May 10. Tail mature, maturity rate 50%.
In 1999, 250 broodstock of 3-4 instars were bred, of which 130 were females, and 84 were matured. The maturation rate was 65%. In 2000, 910 broodstock were reared, including 520 females and a maturity rate of 80%.
2. The results of oxytocin production In the past three years, a total of 591 broodstock were spawned and 235 kg eggs were spawned. A total of 91 kg of fertilized eggs were obtained, and the average fertilization rate was 39%.
3. Incubation and indoor incubation In the past three years, 88.9 million larvae have been hatched. After 8-10 days of indoor cultivation, a total of 76.4 million tailed seedlings (opening 5-8 days of larvae) were bred. The average survival rate was 86%.
4. The results of seedling raising in the earthen ponds for three years have reached an area of ​​650 mu. The opening seedlings have been placed at 6,940 tails, and 8.23 ​​million fry 2–3 cm fishes have been produced. The average survival rate is 11.9%.
VII. Discussion
1. Artificial seedlings of P. acerifolia are bred using wild broodstock or cages. After artificially intensified breeding, they can promote gonad maturation and meet the requirements of oxytocin production. And the broodstock can be enhanced by raising the maturation rate of the broodstock. For example, if the broodstock was not intensively cultivated in 1998, the maturation rate is only 50%. In 1999 and 2000, the broodstock was intensively cultivated, and the maturity rate reached 65% and 80% respectively.
2. The calyx is a mature and batch-spawned fish. From the analysis of the broodstock's anatomy, oxytocin production and climatic conditions, the evacuation period in the coastal area of ​​Guangdong is suitable from the early April to the end of May.
3. In the process of artificial oxytocin production, the development of male gonads is slower than that of females, and the gonads of males have a longer maturation period, which leads to a low fertilization rate during ovulation. How to increase the fertilization rate needs further exploration.
4. Through three years of research on the artificial breeding of H. lanuginosa, the successes of artificial oxytocin, food culture, and fry cultivation have been achieved. The artificial seedlings of this species have now reached the level of mass production. By 2000, the survival rate of outdoor soil seedlings had stabilized at between 6.6 and 15%, and the highest survival rate was 40%.
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