论文部分内容阅读
在扁吻鱼极度濒危,采捕、储运极其恶劣的环境中,利用人力拉行的三层流刺网和自行设计、制作的“水道活鱼储运变形布箱”和“活口筒形布袋”在河道中采捕扁吻鱼成鱼112尾,成活76尾,加上原有成鱼,现有扁吻鱼成鱼92尾。扁吻鱼的性腺发育的再成熟需两周年以上,经过三年的精心饲养、已有10尾雌体的性腺发育到Ⅳ期初和有10尾以上的成熟雄鱼,为2006年生产性人工繁殖打下物质基础。2005年4月25日采捕到成熟亲鱼,经过人工采卵受精,获得约5万粒受精卵,受精率为91.47％；孵化率为80．10％,出苗36 779尾。由于遭到小瓜虫等寄生虫的侵袭,饲养到5月21日的成活率为43．64％,培育到10月25日,平均体重为6．5g、成活率为40．80％。
In the tundra critically endangered, harvesting, storage and transportation in extremely harsh environments, the use of human pull the three-tier flow gill nets and their own design, production of “live fish storage and transportation of deformed cloth boxes,” and “live mouth cylindrical bag ”In the river, 112 adult fish, including 76, are introduced into the river to survive, at 76, plus the original adult fish and the existing 92-year-old fish. Tilia of gonadal development needs more than two years of maturity, after three years of careful breeding, there have been 10 female body gonadal development to early stage Ⅳ and more than 10 mature males, for the 2006 artificial reproduction Lay a material foundation. On April 25, 2005, mature broodstock were harvested and collected. After artificial egg harvesting, about 50,000 fertilized eggs were obtained. The fertilization rate was 91.47%, the hatching rate was 80.10% and the number of emergence was 36,779. As a result of being attacked by small insects and other parasites, feeding to May 21 survival rate was 43.64%, to October 25, the average weight of 6.5g, the survival rate was 40.80%.