Studies on the life history of the land-locked ayu Plecoglossus altivelis in Lake Ikeda. III. Embryonic Development and Morphological Changes with Growth of the Larval and Juvenile Ayu Plecoglossus altivelis of Lake Ikeda in Southern Kyushu.
Studies on the life history of the land-locked ayu Plecoglossus altivelis in Lake Ikeda. III. Embryonic Development and Morphological Changes with Growth of the Larval and Juvenile Ayu Plecoglossus altivelis of Lake Ikeda in Southern Kyushu.
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池田湖内陆香鱼 Plecoglossus altivelis 生活史的研究。
DOI：
10.2331/suisan.57.789
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发表时间：
1991
影响因子：
0.4
通讯作者：
Seirô Kimura
中科院分区：
文献类型：
--
作者：
K. Tachihara;Seirô Kimura
根据1984年10月24日在池田湖人工授精的香鱼卵，描述了香鱼的胚胎发育。卵球形，直径0.87-0.92mm。在水温14.5-23.2°C（平均温度）下，培养时间约为230小时。20.1°C）。初孵仔鱼体长标准，卵黄囊小（av. 5.3mm）和61-62个肌节。孵化后数天内，仔鱼体长达6.0-7.9mm，卵黄物质消耗殆尽。对1.263尾经80 cm（0.353目）网、1 m × 5 m（1 mm）浪带网和13 mm流网采集的幼鱼进行了形态学观察。仔鱼的鳍褶逐渐消失，背鳍、臀鳍、腹鳍和脂鳍分别在11.4、12.8、24.3和44.5mm处残留。锥形齿出现在24.3mm处，梳状齿出现在55 mm处。小于25 mm的浮游生物主要分布在湖外沃茨，大于27 mm的浮游生物主要分布在湖海岸的碎波带。幼虫椎体骨化，直径27.3mm。香鱼在标准体长25- 30 mm和50- 55 mm时发生了较大的形态变化。前者对应于幼虫期的结束，后者对应于幼年期的结束。
The embryonic development of Plecoglossus altivelis altivelis was described on the basis of eggs inseminated artificially on October 24, 1984 in Lake Ikeda. The eggs were spherical, 0.87-0.92mm in diameter. The incubationp eriod was about 230 hours at a water tempera-ture of 14.5-23.2°C (av. 20.1°C). The standard length newly hatched larvae had a small yolk sac (av. 5.3mm) and 61-62 myotomes. Within several days of hatching, the larvae attained 6.0-7.9mm in standard length and had completely consumed their yolk substances. Morphological changes of the larvae accompanying their growth were observed on 1.263 specimens collected by the larval net (80cm in diameter, 0.353 in meshes), the surf zone net (1m×5m, 1mm) and the cast net (13mm). The larval fin fold gradually disappeared, and the rudimental dorsal, the anal, the ventral and the adipose fins were visible at 11.4, 12.8, 24.3, 44.5mm in standard length, respectively. The conical teeth appeared at 24.3mm and the comb-like teeth at 55mm. Larvae smaller than 25mm inhabited the offshore waters of the lake, while those larger than 27mm appeared in the surf zone of the lake shore. The vertebral centrums of the larvae ossified at a size of 27.3mm. It is suggested that the considerable morphological changes of the ayu occurred at sizes of 25-30mm and 50-55mm in standard length. The former corresponds to the end of the larval stage and the latter to the end of the juvenile stage, respectively.