Factory-like full-artificial propagation method of sebastes schlegeli

Abstract

The invention provides a factory-like full-artificial propagation method of sebastes schlegeli. The method comprises the following steps of 1) factory parent fish optimization and cultivation; 2) artificial insemination; 3) parent fish breeding after insemination; 4) parent fish pond arrangement and farrowing; and 5), fry rearing. According to the factory-like full-artificial propagation method ofthe sebastes schlegeli, the insemination success rate of parent fishes reaches 88.5% or above, the farrowing survival rate reaches 78.6% or above, the fry survival rate reaches 48.0% or above, high-quality fries with the average full length of 5.2 cm can be obtained after 2.5 months of cultivation, and the propagation efficiency of female parent fishes of the sebastes schlegeli is effectively improved; and the large-scale mass production of high-quality offspring seeds is broken through, the dependence of directly fishing parent fishes with offspring on wild resources and cage culture parentfish groups is solved, the problems of low factory mating rate, low offspring survival rate and the like are solved, and the method has higher popularization value.

Description

technical field [0001] The invention belongs to the technical field of seawater fish breeding; in particular, it relates to an industrialized full-artificial breeding method for flat scorpionfish. Background technique [0002] Xu's flat scorpionfish, Sebastes schlegelii (Hilgendorf, 1880), also known as Black Rockfish, Black Rockfish in English, is a kind of offshore cold-temperate demersal reef-loving fish belonging to the family Scorpionidae of the order Scorpionidae. Abroad, it is mainly distributed in the east and west coasts of North Korea, the south of Hokkaido in Japan, and the southern waters of the Sea of ​​Okhotsk. Domestically, it is mainly distributed in the Bohai Sea, Yellow Sea and East China Sea. Its meat is tender, delicious, rich in protein and low in fat. It enjoys the reputation of "black grouper" in the north and is very popular among consumers. Because of its strong disease resistance, low temperature resistance, rough food and fast growth, etc. It ha...

AI Technical Summary

Problems solved by technology

[0004] At present, in some northern areas, there is still the phenomenon of directly fishing for wild seedlings to obtain seedlings of flat scorpionfish. The seedlings are dependent on the weather, the supply of seedlings is unstable, the domestication of compound feed is difficult, and the survival rate of seedlings is low. The quantity, quality and survival rate of seedlings are difficult to meet the needs of the breeding industry, and there are serious damage to natural resources and ecological balance.

In recent years, with the breakthrough and development of Xu's flat scorpion seedling breeding technology, and the recognition of artificial seedlings by breeding enterprises, the main way to obtain seedlings is to directly catch wild or netted scorpionfish during the April-May breeding season of Xu's flat scorpionfish. The broodstock of the broodstock cultured in the box is artificially propagated indoors, and this breeding method also has the following problems: 1) the source of the broodstock: the source is relatively unstable. The age and size of sexual maturity cannot meet the needs of reproduction, and if the time for broodstock to reach the breeding and calving stage is not well grasped, it is very easy to cause the broodstock to discharge the larvae directly into the sea and cause losses; on the other hand, if the mating season is around November, the net Huge changes in temperature, wind and waves, etc. in the box culture sea area will lead to low natural mating rate of male and female broodstock, which will directly affect the acquisition of broodstock in the coming year

2) Transportation problem: The broodstock of Huaizi will go through repeated changes in temperature and water quality from the breeding sea area to the nursery workshop. At the same time, there are sharp spines on the back, pelvic fin, and gill cover of the flat scorpionfish, and the broodstock are easy to interact with each other during transportation Stab wounds can easily cause broodstock stress abortion, high mortality rate of larvae, low emergence rate, high deformity rate, high cost, etc.

3) The problem of low reuse rate of broodstock after birth: According to the survey, the mortality rate of broodstock after delivery stress is over 70%, and the reuse rate of broodstock is low, causing unnecessary losses

[0005] At present, the artificial propagation of the flat scorpion chrysalis at home and abroad has not yet made a substantial breakthrough, and it is impossible to obtain highly stable female broodstock through artificial control, nor can it break through the large-scale mass production of high-quality seedlings of the flat scorpion chrysalis. Therefore, the present invention establishes Xu's flat scorpionfish's factory artificial breeding method provides a new method for the next step of rapid seed propagation, improved seed selection and healthy development of the cage culture industry