摘要
During periods when the population size of Japanese anchovy Engraulis japonicus is large, the abundance of 1-yr olds has been considered to be dependent on the growth and survival processes in the late larval and early juvenile stages in the Kuroshio–Oyashio transition region off northern Japan. Recent growth rates for 10 days before capture of larval and early juvenile E. japonicus were estimated and examined in relation to the surface water temperature and the available copepod density in 1997, 1998 and 1999. Late larval and early juvenile E. japonicus were distributed in the waters with temperature from 15 to 19°C and available prey density from 10 to 1000 mg dry weight (DW) m−2 in the transition region. The late larval growth rates were found to be regulated more strongly by water temperature than by copepod density in the waters <16°C, and more strongly by copepod density than water temperature in the waters <100 mg DW m−2 in the Kuroshio–Oyashio transition region. The recent growth rates decreased from the western waters to the eastern waters in the survey area 140–170°E in 1998, correlating with decreases of food availability to 50–100 mg DW m−2. While in 1999, the recent growth rates were faster in the waters east of 150°E, resulting from eastward expansion of warm water ranges and high available prey density 100–400 mg DW m−2. The key environmental factors regulating late larval growth rate of E. japonicus in the transition region seem to be spatially different between years.
摘要译文
在时期，日本鳀鱼鳀鱼的人口规模大，的1年生孩子bundance一直被认为是依赖于在黑潮-亲潮过渡区域的生长和存活过程的后期幼体和早期幼年阶段关闭日本北部。幼虫和早期稚E.捕获之前最近的增长率10天刺参估计和考察相对于地表水的温度并于1997年，1998年和1999年后期幼体和早期稚E.可用的桡足类密度刺参分布在同温度的水从15至19℃，并从可用的猎物密度为10〜1000毫克的干重（DW）米SUP发现后期幼虫生长速率更强烈的水温比桡足类密度水域监管并且更强烈地受到桡足类密度比水的温度在水域最近的增长率从西部海域的东部海域在调查区域140-170°E在1998年下降，粮食供应50-100毫克DW米SUP相关下降2 / SUP。而在1999年，最近的增长率在150°E以东海域更快，从温水范围和东扩造成高可用的猎物密度100-400毫克DW米SUP刺参在过渡区域似乎是年份之间在空间上的不同。
MOTOMITSU TAKAHASHI[1,*] and YOSHIRO WATANABE[2]. Effects of temperature and food availability on growth rate during late larval stage of Japanese anchovy (Engraulis japonicus) in the Kuroshio–Oyashio transition region[J]. Fisheries Oceanography, 2005,14(3): 223-235