提高家鱼人工繁殖效益的主要技术措施

本文通过多年比较试验和生产实践，采取产后亲鱼强化培育、春季稀放和浅水培育、产前流水刺激等技术措施，使鲢、鳙、草鱼提前７－１０ｄ产卵；２次注射催情效率明显高于１次注射，共催产率和孵化率分别提高４３．７６％和３３．４１％。

Technical Measurements in Improvement of Artificial Propagation Efficiency for Chinese Carps

Many comparative studies and practices were conducted to improve the artificial reproductive efficiency for Chinese carps. It is found that silver carp (Hypophthalmichthys molitrix C. et V. ), bighead carp (Aristichthys nobilis Richardson ) and grass carp (Ctenopharyngodon idellus ) can spawn 7- 10 days earlier than in the usual by intensive culture of the broodstock, low stocking density of broodfish in spring and influent stimulus Spawning rates and hatching rates increase 43.76% and 33. 41 % by secondary injection of hormones,respectively