Method for preventing hemorrhage disease of grass carps

Abstract

The invention discloses a method for preventing hemorrhage disease of grass carps. The method comprises the following steps: (1) management: periodically mixing baits and feeding parental fishes with immunopotentiator within the three months before overwintering, and feeding barley straw and formula feed; (2) hatching artificially reproduced eggs to obtain summer grass carp fries; (3) cultivating the summer grass carp fries and putting them into a pond, then inducing domesticating summer grass carp fries to eat the formula feed; and (4) when stocking fries, feeding large grass carps, silver carps and bighead carps in the fish pond; and (5) performing fry feeding management. The prevention method is simple and easy to operate, and by comprehensively using the formula feed and the immunopotentiator and other prevention methods, the good effect of preventing the hemorrhage disease of grass carps can be finally achieved, and the survival rate of the grass carps can be achieved by more than 90%.

Description

technical field [0001] The invention relates to aquaculture, in particular to a method for preventing hemorrhagic disease of grass carp. Background technique [0002] In recent years, with the rapid development of feed fish farming, grass carp (Ctenopharyngodonidellus) has become the leading species of freshwater aquaculture in my country because of its high feed utilization rate, low breeding cost, rapid growth, and high quality. In recent years, with the improvement of intensification, the frequent occurrence of grass carp viral hemorrhagic disease has greatly reduced its survival rate, caused huge economic losses to farmers, and seriously affected the enthusiasm of farmers. [0003] Grass carp seedlings are prone to outbreaks of grass carp hemorrhagic disease from April to June, and can trigger enteritis, gill rot, red skin and other more harmful bacterial diseases. The pathogen of grass carp haemorrhagic disease-grass carp reovirus, when the water quality deteriorates, ...

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Problems solved by technology

The pathogen of grass carp haemorrhagic disease-grass carp reovirus, when the water quality deteriorates, the dissolved oxygen is insufficient, the transparency is low, the oxygen consumption of ammonia nitrogen, hydrogen sulfide and organic matter in the water is high, the resistance of the fish body is low, and the water temperature is high. Massive mortality makes the survival rate of grass carp only 30% to 40%, and some even only about 10%, which brings serious losses to fishery production. At present, many areas are promoting the use of grass carp hemorrhagic disease vaccine. Due to the quality of the vaccine, the occurrence of the virus For reasons such as antigenic variation, the effect of vaccine use is often unsatisfactory. Since there is no effective drug to prevent and treat hemorrhagic disease, the economic loss is serious, and even the safety of grass carp farming is endangered.

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