南海北部陆架区头足类的种类组成和资源密度分布

根据2006～2007年南海北部陆架区4季的调查资料，分析该海区头足类的种类组成和资源密度分布。结果表明，头足类有28种，分隶于3目5科8属；优势种为剑尖枪乌贼Loligo edulis、杜氏枪乌贼L．duvaucelii、中国枪乌贼L．chinensis；头足类渔获率区域分布自东向西递增，A断面最高（11．95kg·h^-1），E断面最低（7．20kg·h^-1）；渔获率有明显的季节变动，夏、秋季较高，冬、春季较低，平均渔获率为9．53kg·h^-1；头足类60～180m水域分布较多，并密集分布于100m左右水深处；其平均资源密度为127．10kg·km^-2。

Species composition and resources density of Cephalopoda in the continental shelf of northern South China Sea

Based on the data of four seasons survey in the continental shelf of northern South China Sea from 2006 to 2007, the species composition and resources density of Cephalopoda were analyzed. The results showed that there were 28 species belonging to 8 genus, 5 families, 3 orders in the area. The predominant species were Loligo edulis, L. duvaucelii and L. chinensis. The catch rate of Cephalopoda gradually increased from east to west in the area, with the highest in transect A （11.95kg·h^-1） and lowest in transect E （7. 20 kg·h^-1 ）. It also showed obvious seasonal variation in catch rate, higher in summer and autumn and lower in winter and spring, with average of 9. 53kg·h^-1. Cephalopoda distributed mainly in the depth of 60 m to 180 m with the most living in the depth of about 100 m. The resources density of Cephalopoda was 127.10 kg·km^-2.