论文部分内容阅读
从市场采购或由野外采捕野生锈斑(虫寻)的成体,采用内分泌、营养和环境条件三个方面结合起来的方法进行亲蟹培育和人工催熟:摘除亲蟹的单侧眼柄;投喂双壳类增加营养;控制水温在25℃～28℃,盐度30～32,pH值8.0～8.4,DO 5mg/L以上,光照强度0～1500 lx。本试验亲蟹的培育成活率达93.3％,抱卵率85.7％,孵化率83.3％。试验结果表明,甲长6.3～7.9 cm的雌蟹,经过培育,性腺均可发育成熟,均可抱卵。锈斑歸属一次性产卵类型,可多次抱卵。水体中聚缩虫等原生动物的大量繁殖直接影响锈斑(虫寻)胚胎和幼体的正常发育和孵化,也是幼体培育成活率低的原因之一。
Purchased from the market or the field of wild rust plaques (insects) adult, the combination of endocrine, nutrition and environmental conditions in three ways for crab breeding and artificial ripening: removal of crab unilateral eyelid; vote cast Feeding bivalves to increase nutrition; controlling water temperature at 25-28 DEG C, salinity 30-32, pH value 8.0-8.4, DO 5mg / L or more, light intensity 0-1500 lx. The test crab breeding survival rate of 93.3%, hold the egg rate of 85.7%, the hatching rate of 83.3%. The results showed that female C. sinensis 6.3 ~ 7.9 cm in length, after training, gonads can develop mature, can hold eggs. Rust spots belong to a one-time spawning type, can hold eggs several times. The multiplication of protozoan such as polycyclic insects in water body directly affects the normal development and hatching of rust and larvae, which is also one of the reasons for the low survival rate of larval culture.