东海区短鳄齿鱼数量分布及其与环境因子的关系

根据2005年东海区(26°30′～35°00′N、121°00′～127°00′E)渔业资源监测底拖网调查资料,结合广义相加模型(GAM)方法分析了东海区短鳄齿鱼资源的时空分布特征以及水深、水温、盐度与数量分布的关系。结果表明:东海区短鳄齿鱼主要分布区域为:28°00′～30°00′N、123°00′～126°30′E;生物量季节变化明显,以秋季(9月)最高,春季(4月)最低;短鳄齿鱼适宜水深、温度、盐度范围分别为70～110 m、17～23℃、34.3～35.2。结合东海海流分布特点,初步推断短鳄齿鱼为暖水性海洋小型鱼类,其生物量分布和季节变化受台湾暖流影响。

Biomass distribution of Champsodon snyderi and its relationship with environmental factor in the East China Sea

Based on the data taken from bottom trawl fisheries resources survey in East China Sea(26°30′-35°00′N,121°00′-127°00′E) during 2005,combined with GAM model,the biomass distribution of benttooth Champsodon snyderi and its relationships with depth,temperature,and salinity have been analysed.The results showed that benttooth mainly distributed in the area of 28°00′-30°00′N,123°00′-126°30′E.The seasonal variation of the stock of benttooth was obvious,with the maximum in autumn(September) and the minimum in spring(April).By means of GAM model,the calculated optimal scale of temperature and salinity as well as depth were 17-23 ℃,34.3-35.2,70-110 m,respectively.Conbined with the distribution characteristic of main current in the East China Sea,it could be preliminarily deduced that Champsodon snyderi would belonged to be a small-scale marine fish adapted living in the warm water,its distribution and seasonal variation were affected by the Taiwan current.