2003-2005年通过对半滑舌鳎亲鱼的优选和强化培育,在人工温光调控条件下,获得了良好的产卵效果。本文对半滑舌鳎亲鱼室内培育方法、性腺发育规律、产卵习性、产卵规律及产卵期产卵量、受精率、孵化率、卵子质量等的变化作了较为详细的叙述。结果表明,半滑舌鳎野生亲鱼经人工驯化、强化培育和调控温度、光照等技术,可使亲鱼自然产卵,并有规律的连续产卵,产卵期长达40~50d;产卵量在整个产卵期间呈抛物线式变化;受精率和孵化率随产卵期的推移逐渐增高,以产卵盛期时最高,说明此时卵子质量最好。在本实验条件下,培育到3龄的人工亲鱼又可成熟自然产卵,但产卵效果明显不如野生亲鱼。
The technology of spawner culture and egg collection of Cynoglossus semilaevis Günther was studied from 2003 to 2005. By reinforced cultivation of those well-chosen parent fish, a relatively ideal spawning result was obtained, The spawning habit and regular pattern, the eggs volume, the eggs quality, fertilization rate, hatching rate were detailed in this paper. After artificially enriching and culturing, the spawners could spawn continually and last for 40 -50 days. As observed, the spawning quantity in a spawning period varied as parabolic curve, therefore, the spawning activities could be divided into three stages, the early stage, peak stage and late stage. Normal egg percentage, hatching and fertilization rates gradually increased in the early and reached a peak when peak hour spawning came. According to our experiments, those 3-years-old fish grown-up artificially could get mature to spawn, but both quality and quantity of eggs spawned were much worse than those of wild spawners.