南海中北部尾明角灯鱼渔业生物学特性的初步研究

根据2014年和2015年在南海中北部海域中层拖网采集的尾明角灯鱼(Ceratoscopelus warmingii)样本,对其体长和体质量组成、性比、性腺成熟度和摄食等级等生物学特性进行了初步分析。结果显示,尾明角灯鱼的体长为32～76 mm,优势体长组为 45～60 mm, 占总数的 86.9%, 平均体长为( 51.476.60)mm; 体质量为0.3～4.3 g, 优势体质量组为1.0～2.5 g,占总数的 91.1%,平均体质量为(1.60.61) g; 雌 雄个体大小不存在显著差异( NOVA,P0.05);生长参数b为2.581,表明尾明角灯鱼为异速生长;雌雄性比为1.391,在不同月份、不同体长组中差异较大,10月和1月雌性比例远高于雄性;不同月份均有性成熟个体,性腺成熟度Ⅰ期和Ⅱ期为主,性腺成熟比例最高为1月; 初次性成熟体长为51.4 mm; 摄食等级0～4级所占比例分别为10.8%、46% 、33.9%、8.1%和1.3%。

A preliminary study on fishery biology of Ceratoscopelus warmingii in the central and northern South China Sea

Based on Ceratoscopelus warmingii samples collected by mid-water trawl in the central and northern South China Sea during 20 14 and 2015,we investigated the biological characteristics including body length and weight composition,sex ratio,gonad maturity stage ,feeding stage of C.warmingii.The body length ranged from 32 mm to 76 mm with an average of 51.47 mm. The dominant group of body length was 45～60 mm (86.9%) . The range of body weight was 0.3～4.3 g with dominant group of 1.0～2.5 g (91.1%) and the average weight was 1.6 g. However,the body size had no significant difference between female and male.The growth parameter value of b was 2.581,and C.warmingii growth appeared allometry.The sex ratio of female to male was 1.391, and there was significant difference among different months and size-different groups. The ratio of female in the samples was higher than that of male in January and October. Gonad samples of C.warmingii appeared in all five months, mainly at StageⅠ and StageⅡ.The maximum perce ntage of gonad maturi ty appeared in January.The length at 50% maturity was estimated as 51. 4 mm. The feeding stage 0～4 accounted for 10.8%, 46%, 33.9%, 8.1% and 1.3% of the total number, respectively.