The present study researches the deposition rate of growth increment in the otolith of black porgy, Sparus macrocephalus (Basilewsky) larvae and the effect of different photoperiod on production of daily growth increments.Black porgy larvae were reared from fertilized eggs spawned by one adult reared in the laboratory of Institute of Oceanology, Academia Sinica in May, 1986. The otolith showed a daily growth rhythm under a 12 light-12 dark photoperiod. The regression equation of chronological age based on t...
【基金】
国家自然科学基金资助,3860810号
【正文快照】
鱼类耳石上的日生长轮的存在是很普遍的现象。在24h左右形成的日生长轮是由生长带和间歇带组成的(Mugiya et al.,1 981)。耳石日生长轮的形成是与内分泌固有的周期性节律有联系的。但是,环境因素对其形成也会产生影响。有些学者认为,光照周期是控制某些种类耳石生长轮形成的主?