利用形态学方法分析印度洋西北部海域鸢乌贼种群结构  

Morphological analysis on population structure of Sthenoteuthis oualaniensis in the northwestern Indian Ocean

作　　者：陈新军[1] 刘金立[1] 

机构地区：[1]上海水产大学海洋学院,上海200090

出　　处：《上海水产大学学报》2007年第2期174-179,共6页Journal of Shanghai Fisheries University

基　　金：上海市教委曙光计划项目"印度洋西北公海鸢乌贼生物学研究"(05-11);上海市重点学科项目(T1101)

摘　　要：根据2003-2005年我国对印度洋西北部公海鸢乌贼资源调查资料,依据胴长组成及触腕长等8个形态学参数,利用正态分布、星座聚类等方法对其种群结构进行分析。结果表明,鸢乌贼胴长组成为10.6-61.2 cm,优势胴长组为28-36 cm。胴长组成随纬度变化明显。初步可分优势胴长为46-52 cm、30-36 cm和20-24 cm的大型、中型和小型三个种群。18°N以北海域以大型种群为主,12°N-18°N海域以中型种群为主,12°N以南海域以小型种群为主,但大型、中型和小型种群重叠分布。三个种群间的主要形态特征值(AL1/ML、AL2/ML、AL3/ML和AL4/ML)也存在较为显著的差异。初步推断,鸢乌贼可能是全年性产卵,并存在多个产卵群体。Based on the investigations made by Chinese squid jigging vessels in the northwestern Indian Ocean from 2003 to 2005, the morphological characteristics of Sthenoteuthis oualaniensis including mantle length （ML）, tentacle length etc. were measured. This paper assessed the population structure of S. oualaniensis using the morphological analysis methods such as the linear transformations of normal distribution and gray clustering analysis. The results showed that the ML of the catch ranged from 10.6 to 61.2 cm, and the dominant group located at 28-36 cm ML. There may be three populations with different physical forms in the northwestern Indian Ocean： the large-sized population distributed in the north of 18°N with dominant ML between 46cm and 52 cm; the medium-sized population distributed in 12°N-18°N with dominant ML from 30cm to 36 cm; the small-sized population distributed in the south of 12°N with dominant ML between 20 cm and 24 cm. These distinguished populations partly overlapped in the most areas of northwestern Indian Ocean. There are obviousl differences for main morphological characteristics indicators among three populations. The paper also deduced that S. oualaniensis may be spawning all year around and be divided into several spawning groups.

关 键 词：鸢乌贼 种群结构 形态学 印度洋西北部海域 

分 类 号：S931.5[农业科学—渔业资源]