Distribution and migration of a catadromous sculpin, Cottus kazika, larvae and juveniles in the Yura estuary and neighboring waters, facing Wakasa bay [Japan]
Distribution and migration of a catadromous sculpin, Cottus kazika, larvae and juveniles in the Yura estuary and neighboring waters, facing Wakasa bay [Japan]
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若狭湾对面的由良河口及邻近水域的降水杜父鱼、Cottus kazika、幼鱼和幼鱼的分布和洄游[日本]
DOI：
10.11369/jji1950.46.91
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Masaru Tanaka
中科院分区：
文献类型：
--
作者：
S. Harada;I. Kinoshita;Hiroaki Omi;Masaru Tanaka
为了阐明卡氏杜父鱼（Cottus kazika）的早期生活史，我们于1993年11月至1994年5月和1995年1月至6月在若狭湾西部的尤拉河口及邻近沃茨用各种方法采集了仔、稚鱼，并对其分布、洄游、生长和食性进行了研究。在多石的海岸使用水族箱进行采集，主要产生卵黄囊幼虫，这些幼虫往往与大潮同步发生。这一趋势也支持了从耳石微结构增量估计的孵化日期的反计算。大部分仔稚鱼是在5米深的区域（平均盐度约34 ppt）用桁拖网（3.5至30米深）收集的。我们没有收集到C。在10至50米深的沿海地区用幼虫网斜拖kazika幼虫和幼体。在涉水区的碎波带，许多幼虫和少年收集，特别是在最低盐度（平均约26 ppt）站最接近河口。幼鱼和幼鱼的平均大小在碎波带大于在5米的深度区域。食物习惯随着生长而改变，并且在栖息地之间存在差异。浮游幼虫在5米深处以桡足类为食。定居的仔、稚鱼主要以5 m深处的糠虾为食，而在碎波带的涉水区则以革虾为食。此后，幼鱼在河口捕食Tanaidaceans和毛翅目幼虫。
To clarify the early life history of Cottus kazika (Cottidae), we examined the distribution, migration, growth and food habit of larvae and juveniles collected by various methods from the Yura estuary and neighboring waters in western Wakasa Bay from November 1993 to May 1994, and from January to June 1995. Collections using an aqualamp in the rocky shore yielded mostly yolk-sac larvae, which tended to occur synchronously with the spring tide. This tendency was supported also by the back calculation of the hatching date estimated from otolith microstructural increments. Most of the larvae and juveniles were collected in the 5 m depth areas (mean salinity about 34 ppt) with a beam trawl (from 3.5 to 30m depth). We collected no C. kazika larvae and juveniles by oblique tows of a larva net in coastal areas of 10 to 50m depth. In wading areas of the surf zone, many larvae and juveniles were collected, particularly at the lowest salinity (mean about 26 ppt) station nearest to a river mouth. Mean size of larvae and juveniles were greater in the surf zone than in the 5 m depth areas. Food habits changed with growth, and differed between habitats. Pelagic larvae fed on copepods in 5m depth areas. Settled larvae and juveniles chiefly fed on mysids in 5 m depth areas, and gammarids in the wading areas of the surf zone. Thereafter, juveniles fed on tanaidaceans and trichopteran larvae in the estuary.