文章摘要
军曹鱼(Rachycentron canadum)的胚胎发育及仔稚鱼形态观察
Embryonic development and morphological characteristics of larvae and juvenile of cobia (Rachycentron canadum)
投稿时间:2020-08-31  修订日期:2021-01-08
DOI:
中文关键词: 军曹鱼  胚胎发育  仔鱼  稚鱼  形态特征
英文关键词: Rachycentron canadum  embryonic development  larvae  juvenile  morphological characteristics
基金项目:现代农业产业技术体系专项资金资助(CARS-47);广东海洋大学科研启动经费资助项目(R19022);南方海洋科学与工程广东省实验室(湛江)(ZJW-2019-06)
作者单位邮编
邝杰华 广东海洋大学 水产学院 524025
陈刚 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 524025
马骞 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 
黄建盛 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 
张健东 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 
施钢 广东海洋大学 水产学院 
王忠良 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 
汤保贵 广东海洋大学 水产学院南方海洋科学与工程广东省实验室(湛江) 
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中文摘要:
      对军曹鱼(Rachycentron canadum)早期发育阶段的胚胎及仔稚鱼进行了连续观察,并记录分析各胚胎发育期及不同日龄仔稚鱼的形态特征。结果表明,军曹鱼受精卵呈圆球形,为浮性卵,卵径(1.245±0.065) mm,油球1个,油球径(0.325±0.027) mm。在水温(27.0±0.5)℃,盐度29,pH 8.3条件下,军曹鱼卵从受精至孵化出膜约需26 h 30 min,经历合子、卵裂、囊胚、原肠胚、神经胚、器官形成和孵化出膜7个阶段,共24个时期;初孵仔鱼平均全长(3.253±0.096) mm,孵化后第5天卵黄囊消失,第7天油球耗尽,转化为外源性营养;第14天全长(19.933±1.118) mm,各鳍鳍条形成,进入稚鱼期;22日龄稚鱼全长(41.140±3.779) mm,尾柄部开始出现鳞片,46日龄的后期稚鱼全长达(116.667±5.916) mm,体表完全覆盖鳞片,除尾鳍形状外,体形与成鱼相似。
英文摘要:
      The morphological characteristics were observed and studied in the early life stage of cobia(Rachycentron canadum),the growth and development characteristics of the embryos, larvae and juvenile were described. The results showed that the fertilized eggs were spherically shaped and buoyant, there was an oil-ball in the central, with an egg diameter of (1.245±0.065) mm and an oil-ball diameter of (0.325±0.027) mm. The fertilized eggs hatched 26 h 30 min after fertilization in the sea water at 27.0±0.5℃, salinity of 29 and pH of 8.3. The embryonic development process was divided into 7 stages, including fertilized egg stage, the cleavage stage, the blastocyst stage, the gastrula stage, the neurula stage, the organogenesis stage and the hatching stage (total 24 developing periods). The total length (TL) of newly hatched larvae was (3.253±0.096) mm, the yolk-sac and oil-ball completely disappeared at 5 days post hatching (dph) and 7 dph respectively, and the larvae completely entered the exogenous nutritional stage. The larvae started to develop to juveniles at 14 dph (TL of 19.933 mm±1.118 mm) when each fin completely formed. At 22 dph, the juvenile with a total length of (41.140±3.779) mm, there were some scales on the caudal peduncle formed. The 46 dph juvenile reached (116.667±5.916) mm in TL, the whole body covered with cycloid scales and their general appearance was similar to the adult fish, except for the shape of caudal fin.
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