舟山崎头洋海域春秋季鱼类种类组成及数量分布

本研究利用2012年5月（春季）、10月（秋季）2个季度月的单船底拖网渔获的鱼类样品，对舟山渔场崎头洋海域鱼类种类组成、区系特点及数量分布等进行了研究。结果如下：（1）共获得鱼类50种，隶属于11目27科，以石首鱼科和缎虎鱼科的种类最多，各有7种，分别占总种数的14．0％；（2）根据适温性可将其划分为暖水性和暖温性2种适温类型，以暖温性为主，有36种，占鱼类总种数的72．0％；（3）春季主要集中在舟山本岛一小干岛海域，而秋季则集中在舟山本岛一小干岛海域以及穿山半岛一六横岛西南海域；（4）春季优势种有六丝矛尾锻虎鱼Chaeturichthys hexanema、带鱼Trichiurus haumela、鲈鱼Lateolabrax japonicus、棘头梅童鱼Collichthys lucidus、龙头鱼Harpodon nehereus等5种，而秋季优势种仅龙头鱼1种；（5）通过分析优势种的种群组成和底层温盐数据，发现该海域在春季可能为带鱼、棘头梅童鱼和鲈鱼等幼鱼的索饵场。

Species composition and quantitative distribution of fishes in the Qitou Sea,Zhoushan

Based on the survey data collected by bottom trawl in the Qitou Sea belong to Zhoushan Fishing Ground in May and October 2012, we analyzed the fish species composition, fauna characters, and quantitative distribution in the survey area. The result showed that ： （ 1 ） 50 species of fish were caught and identified in spring and autumn, which belonged to 11 orders and 27 families. Most of them belonged to Sciaenidae and Gobiidae, and each has 7 species, accounting for 14.0%. （2） In thermal adaptation, fishes in this area could be divided into two types, including warm - water species, warm - temperate species. The fishes which were caught mainly belonged to warm - temperate species, who had 36 species, accounting for 72.0%. （3） Distribution of the catch rates showed that more fishes were caught between the zone of Zhoushan Island to Xiaogan Island sea area in spring, and in autumn, the fishes were concentrated on two sea area including Zhoushan Island to Xiaogan Island sea area and the northwestern of Chuanshan Peninsula to Liuheng Island sea area. （4） There were 5 dominant species in spring that were Chaeturichthys hexanema, Trichiurus haumela, Lateolabrax japonicus, Collichthys lucidus, Harpodon nehereus ; but in autumn, Harpodon nehereus was the unique dominant specie. （5） According to the salinity and the water temperature in the area surveyed in bottom, the population structure of the dominant species was analyzed. We infered that there was probably a feeding ground in the area for the adolescent fish such as Trichiurus haumela, Lateolabrax japonicus and Collichthys lucidus in spring.