摘要
本文根据1980—1986年、1989年调查资料,研究了浙江近海幼带鱼群体组成、生长、洄游、平面分布、垂直分布、季节分布以及不同时期数量变化,提出了进一步做好幼带鱼保护工作的若干建议。
This paper discusses the population structure,distribution and stock size variation of young hairtails in the coastal waters of Zhejiang,based on investigations conducted in 1980—1986 and 1989. 1.Young hairtails enter the sea area along the coast of Zhejiang in batches in search of food,the dominant group being 46—90 mm in anus length.Individuals caught during the early stage increase in body size as the site moves from east to west;the trend is reversed in the later stage. 2.The young hairtails grow 80—120 mm in the same year with maximum growth occurring during July-October at a rate of 14—20 mm month.When the young fish reach a body length of approx.100 mm,they migrate towards the deep sea for food and overwintering. 3.Young hairtails are distributed throughout the area investigated, their number diminishing from east to west.Dense populations are found east of the 15-meter isobath in northern Zhejiang and 10-meter isobath in southern Zhejiang. 4.The young hairtails make their appearances almost all the year round. The peak period in N.Zhejiang is from the middle of May to the first part of Sept.,that in Central Zhejiang from the first part of June to the middle of Aug.,and that in S.Zhejiang from middle of May to the end of July. 5.There is considerable variation in the number of young hairtails present at different periods. Measures such as prohibition of Set-Net fishing and protection of the spawning sites have effectively preserved large numbers of young hairtails, but there are signs of nelaxation in some places in the execution of the order against Set-Net fishing,which calls for attention from the relevant departments,Other suggestions for the further protection of young hairtails are put forward in the paper.
关键词
浙江近海
带鱼
幼带鱼
分布
Zhejiang coastal waters
young hairtails
distribution
protection
