A method for comprehensive disease prevention and control to improve the survival rate of main grass carp in ponds

Abstract

The invention discloses a comprehensive disease prevention and control method for increasing the survival rate of grass carps mainly raised in ponds. The method specifically comprises the operation steps of injection immunization, accurate feeding, targeted pest killing in early spring, feeding of green feed as assistant materials, supplementary immunization with immune enhancers and periodic water regulation through the adoption of exogenous microecological preparations. By means of the comprehensive disease prevention and control method, the self-immunity of the grass carps is improved, the damage of small parasites in the early period is controlled, a good water environment is created, and the unfavorable influences of the environment on the growth of the grass carps are reduced; the survival rate of the grass carps is increased to 90% or above from original 50-60%, the application amount of chemical drugs in the raising process is reduced by 70%, and basically, no antibiotic is used.

Description

technical field [0001] The invention belongs to the technical field of aquaculture, and relates to a comprehensive disease prevention and control method for grass carp, in particular to a comprehensive disease prevention and control method for improving the survival rate of second-year-old grass carp species or commercial fish mainly raised in ponds. Background technique [0002] grass carp( Ctenopharyngodon idellus ), commonly known as grass carp, white carp, etc., belongs to Cyprinidae, Cyprinidae, Yaluo subfamily, and grass carp genus. It is a unique fish species in the plains from Guangxi to Heilongjiang in eastern my country. It has been transplanted to many countries in Asia, Europe, America and Africa. Grass carp is one of the "four major fishes" in freshwater farming in China. Because of its fast growth and wide source of feed, grass carp is deeply loved by farmers. It is cultivated from south to north, and has become one of the leading species of aquaculture in my ...

AI Technical Summary

Problems solved by technology

[0004] Grass carp is mainly raised in ponds because of its advantages of high breeding density, high output, and easy management. It is currently the main farming method for grass carp in my country. However, due to the large carrying capacity of grass carp and insufficient self-purification ability of the water body, grass carp’s self-immunity and disease resistance have declined. Poor strength, easy to be infected with various diseases at all stages of breeding, the mortality rate of second-year-old fish species and commercial fish farming is as high as 50%, which seriously affects the production and benefits of farming

[0005] At present, the prominent links that restrict the healthy development of the grass carp aquaculture industry mainly focus on four aspects. First, regarding the control of parasites, many farmers use abamectin, ivermectin, and permethrin to kill large parasites all year round. Classes, etc., even used 1 or 2 times a month, the medication lacks pertinence; and the early spring season is just the epidemic stage of small parasites, and once it breaks out, the loss will be serious

In the second aspect, regarding water quality control, it is too subjective and blind to judge whether the water quality of the pond is good or bad and decide whether to carry out water quality control based on experience alone.

In the third aspect, with regard to feeding and management, excessive pursuit of fish body growth and blindly increasing bait feeding have resulted in the decline of fish body metabolic and immune functions

The abuse of antibiotics, insecticides, and disinfectants caused by serious pests and diseases endangers product quality and safety