Method for lowering turbot pedigree fry ascites disease morbidity and mortality

Abstract

The invention discloses a method for lowering turbot pedigree fry ascites disease morbidity and mortality. The method comprises the steps of firstly optimizing a maturity promoting breeding condition for parent fish; secondly adopting a scientific fine fry breeding method to formulate a reasonable and effective artificial breeding mating scheme so as to avoid inbreeding depression and achieve optimum mating combination among pedigrees; thirdly, adopting an optimized breeding scheme to conduct pedigree fry breeding, wherein through the implementation of the scheme, not only is the fry breeding cycle shortened, but the fry with stronger physique and higher disease resistance is also obtained, and the morbidity rate of ascites disease in a fry period is effectively reduced; finally, conducting timely isolation of the pedigree fry which are attacked by ascites disease and reasonable adjustment of the breeding method, and implementing a strategy of 'improvement of both internal environment and external environment'. In this way, expanding of range of the state of illness is prevented, the adaption environment of the fry is also timely improved, the survival rate of the fry is increased, and the turbot pedigree fry ascites disease morbidity and mortality rate are thus effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of selection and breeding of high-quality marine animals, in particular to a cultivation method for effectively reducing the incidence and mortality of ascites in the seedlings of turbot family. Background technique [0002] Turbot (Scophthalmus maximus L.) is a benthic marine fish native to Europe. It has the advantages of delicious taste, rapid growth, low temperature resistance and easy domestication. It is one of the excellent marine aquaculture species in Europe and other places. Turbot was introduced into my country in 1992 and broke through the productive seedling technology in 1999. Its breeding scale has developed rapidly, and it has become an important fish breeding species along the northern coast of my country, with an annual economic value of billions of RMB. [0003] Over the past ten years, due to neglect of research on breeding of improved varieties, the phenomenon of germplasm decline in the...

AI Technical Summary

Problems solved by technology

With the rapid expansion of the scale of turbot breeding, the problems related to the breeding of seedlings and adult fish have become increasingly prominent. In recent years, some diseases that are difficult to cure have appeared, such as ascites disease, red body disease, scabies, shield Ciliatisis, slow growth of seedlings, poor food intake, decreased disease resistance caused by damage to the liver, gallbladder, spleen and kidneys during the breeding period of seedlings and adult fish due to frequent and excessive use of antibiotics and other medicated bath products, etc.

These problems lead to large-scale mortality of turbot seedlings, and bring huge economic losses to improved seed selection and breeding production

[0004] Among them, especially ascites disease is the greatest threat to the cultivation of seedlings. The onset period is 35-60 days after seedlings are cultivated. Strong, there is still no effective cure, and there is no way out