太平洋鲱鱼的胚胎发育及初孵仔鱼的形态

OBSERVATIONS ON THE EMBRYONIC DEVELOPMENT AND PRE--LARVAE OF PACIFIC HERRING

摘要: 本文介绍了通过人工授精法取得的太平洋鲱鱼受精卵的胚胎发育和初孵仔鱼的形态。大平洋鲱鱼的受精卵为粘性球形卵,无油球,卵径为 1.42—1.65mm。胚胎发育过程中对水温及盐度变化的适应能力较强,其胚胎发育形态同一般硬者鱼类大体相同,唯色素细胞的出现较晚。从受精至孵化在水温7.5—13.2℃条件下,约需经过9.6—12.5个昼夜。初孵仔鱼的全长为 5.94—7.66mm,肌节为 56—58节,卵黄囊呈卵圆形位于第 3—12肌节下方,消化管的末端位于第48—49肌节下方,沿消化管上方两侧各有一列枝状黑褐色素,在胸鳍基的下方及肛门开口处,各有一个黑褐色素斑。

Abstract: The experiment was carried out in April, 1974 at Daiyu Island, Rongcheng xian,Shandong province and materials were obtained from the artificial fertilization. Thedevelopment of the fertilized eggs and pre-larvae stages of the Pacific herring, Clupeapallasi (Cuvier et Valenciennes) was observed and described in this article. At water temperature 10.5-11.5℃, the larvae hatched out for 12.5 days. Thenewly hatched larvae were about 5.94-7.66 mm in total length.