土池低盐度水体河蟹生态育苗试验

The Study of Larval Breeding of Eriocheir sinensis by Ecological Way in Low Brackish Water Ponds

2003年3～5月，在上海崇明进行了河蟹（Eriocheir sinensis）在低盐度水体的土池中育苗实验，主要技术措施包括亲本的强化培育、施肥养水、敌害生物的控制和利用、活饵料的科学使用和水质调控等。结果表明：（1）亲本强化培育可以提高其生殖性能；（2）土池育苗中各期幼体的变态时间长于工厂化育苗，因而总的出苗时间比工厂化育苗长5～7d；（3）通过综合管理措施，在低盐度（9—12）条件下河蟹土池生态育苗单产和出苗率分别为（60．18±30．17）kg／hm^2和（3．12±1．55）％，总的出苗时间为（25．2±1．9）d。

During March to May in 2003, the experiment was conducted to breed larval Eriocheir sinensis in low brackish water（9- 12）ponds by ecological way in Chongming island. The main technical measures include enriching broodstock, fertilizing before larval hatching, controlling harmful organism, using natural live food and adjusting water quality, eta]. The results indicated that ： （ 1 ） The reproductive performance could be improved by enriching broodstock crabs ; （ 2 ） The duration of larval metamorphism in earth ponds was longer than those of indoor tanks ; （ 3 ） Under the systemic management, the megalopa production, survival rate and duration from Z1 to megalopa were （60. 18 ± 30. 17 ）kg/hm^2, （3, 12 ± 1.55 ）% and（ 25, 2 ±1.9 ）d respectively by ecological way in earth ponds with low salinity.