摘要
根据2004年7月-11月西北太平洋秋刀鱼探捕调查的生物学数据,通过统计回归方法分析了秋刀鱼的性腺成熟度,摄食等级,性比,叉长分布,叉长和体重、净重关系。结果为:性成熟度为Ⅱ期的占52.96%;摄食等级主要为2级和3级,占72.91%;性比接近1∶1;体长范围为186-340 mm,优势体长组为220-280 mm;雌性的叉长略大于雄性;群体可能属于两个不同群体,生长参数大于3。
Based on the biological data of Cololabis saira measured from investigation made by stick-held net in the north Pacific Ocean high sea during July and November 2004, this paper analyzed the Cololabis saira maturity stages of the gonad , feeding intensity, sex ratio, fork length distribution, relationships between fork length and net weight , fork length and round weight by statistic and regression methods. The results indicate： 1 ） Maturity at stage Ⅱ of the gonad is dominant with percentage of 52.96%. 2） the feeding intensity is mainly in class 2 or class 3 ,totally 72.91%. From above, it can been deduced that the investigation area is feeding ground for Cololabis saira. 3 ）the female-male ratio is near 1 ： 1. 4 ）the fork length range is 186 -340 mm and the dominant length is 220 -280 mm, the fork length of female is slightly larger than male＇ s. The fork length frequency distribution indicates Cololabis saira might belong to two different populations. 5 ）the growing parameter is greater than 3.
出处
《上海水产大学学报》
CSCD
北大核心
2007年第3期264-268,共5页
Journal of Shanghai Fisheries University
基金
2005年上海市科技兴农重点攻关项目
上海市重点学科建设项目(T1101)
关键词
秋刀鱼
生物学特性
北太平洋公海
Cololabis saira
biological characteristics
North Pacific Ocean high sea
