摘要
本文报道采自辽东半岛沿岸鳗鲡(Anguilla japonica)的白仔鳗和经人工培育的当年幼鳗耳石日轮生长的观察结果。白仔鳗和幼鳗耳石平均直径均与体全长成直线相关。12尾白仔鳗耳石的平均日轮数146.3,据此推测其产卵期为11—12月。观察证实从咸淡水转人到淡水生活的幼鳗耳石的环纹有过渡带存在。
This paper reported the results of observing daily growth increments in the otoliths (sagitta) of the glass eels collected from river estuary of Liaodong Peninsula and elvers artificially reared. The mean diameters of otoliths of the glass eels end elvers were linear correlation to their body length. The mean daily growth increment in the otoliths of 12 glass eels was 146.3. From the daily increments, it was guessed that their spawning period could be 11-12 month. The observation results proved that there were transition zones (mark ring) in the otoliths of elvers lived in different conditions from estuary to fresh water.
关键词
鳗鲡
耳石
日轮
过渡带
Japanese eel, Otolith, Daily increment, Transition zone
