论文部分内容阅读
目前,我省草、青鱼鱼种,特别是斤两鱼种甚为短缺。这在一定程度上影响了成鱼养殖生产的发展。为此,对提高当年草鱼种成活率及其培育大规格鱼种问题进行了探讨,现将主要技术介绍如下。 1.注射免疫:据调查,我省当年草鱼种的主要病害是出血病。以往使用多种药物进行防治,疗效不够理想。近几年来采用出血病灭活疫苗进行注射免疫预防,取得较明显效果。其成活率由25％左右提高到70％上下。免疫注射首先要制备、使用高质量的疫苗。其次要适时免疫。我省当年草鱼出血病一般在7月中旬前后发生流行。因此,应在6月底7月初进行注射。若按常规草鱼发塘,夏花培育至注射规格,时至7月中旬之后,出血病已发生流行。
At present, our province grass, black carp species, especially catty two species is very short. To a certain extent, this has affected the development of adult fish farming and production. To this end, to improve the survival rate of grass carp species and cultivate large species of fish species were discussed, the main technology are as follows. 1. Injections Immunization: According to the survey, the main disease of grass carp species in our province was hemorrhagic disease. Past use of a variety of drugs for prevention and treatment, the effect is not ideal. In recent years, hemorrhagic inactivated vaccine injections for immunoprophylaxis achieved more obvious results. Its survival rate from about 25% to 70% up and down. Immunization should first be prepared using high-quality vaccines. Second, timely immunization. Grass carp hemorrhagic disease in our province then prevailed in mid-July around. Therefore, injections should be conducted by the end of June and early July. According to the conventional grass carp ponds, summer flowers cultivated to injection specifications, when mid-July, bleeding has been prevalent.