论文部分内容阅读
无棘血居吸虫病是养殖鲤(Cyprinus carpio L.)的一种严重疾病,能导致早期鱼苗很高的死亡率.常用感染试验来研究寄生虫的侵入方式及侵入后的行为和发育.尾蚴在30min内即可达到最强感染程度,接着迅速发育生长.在最初12h内体长增加1倍,以后生长变慢,这阶段主要的器官进行发育,在60～90d内性腺成熟.感染主要发生在鳍部,尤其是尾鳍,有大量的幼虫留在皮肤上,在那里继续发育成熟.感染后不久发现在心脏和鳃丝中有少量寄生虫.感染后60d开始从皮肤上转移,90d时,在心脏和鳃管中发现大量虫体(57%)并伴有卵的发生.120d后鳃心部位中的寄生虫数量开始下降,尽管鳃、心部位的寄生虫和皮肤上的寄生虫在许多特征方面不同,但在两个部位同时发生产卵.
Acanthamoeba japonica is a serious disease of carp (Cyprinus carpio L.), which can lead to high mortality rate of early fry. Common infection tests are used to study the invasion of parasites and behavior and development after invade. Within 30 min, the strongest infection can be achieved, followed by the rapid development of growth.During the first 12 hours, the body length increased by 1 times and later grew slowly, and the main organs developed at this stage and the gonads matured within 60-90 days. A large number of larvae remain on the skin in the fins, especially the caudal fin, where they continue to mature, and few parasites are found in the heart and gill filaments shortly after infection, and they begin to migrate from the skin 60 days after infection. At 90 days, Large numbers of parasites (57%) and accompanying eggs were found in the heart and gill tube. The number of parasites in the gill heart area began to decline after 120 days, although many parasites in the gill, heart area and parasite on the skin The characteristics vary, but spawning occurs simultaneously in both locations.