文章摘要
李建华,陈新军,刘必林,陆化杰.夏秋季西北太平洋柔鱼渔业生物学的初步研究[J].上海海洋大学学报,2011,20(6):890-894
夏秋季西北太平洋柔鱼渔业生物学的初步研究
Biological characteristics of Ommastrephes bartramii in northwest Pacific Ocean
  
DOI:
中文关键词: 柔鱼  西北太平洋  渔业生物学  渔获群体
英文关键词: Ommastrephes bartramii  northwest Pacific Ocean  biological characteristics  population of the catch
基金项目:教育部博士点基金(20093104110002);国家高技术研究发展计划(2007AA092202);国家自然科学基金(NSFC40876090);〖JP〗国家发改委项目(2060403);上海市重点学科建设项目(S030702)
作者单位
李建华 上海海洋大学 海洋科学学院 
陈新军 上海海洋大学 海洋科学学院 
刘必林 上海海洋大学 海洋科学学院 
陆化杰 上海海洋大学 海洋科学学院 
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中文摘要:
      根据2007年7-10月我国鱿钓船在西北太平洋传统鱿钓作业渔场(150°~165°E,39°~45°N)渔汛期间所采集的柔鱼样本,对夏秋季柔鱼渔业生物学特性进行初步研究。研究得知,渔获物胴长范围为200~436 mm,平均胴长为282 mm,优势胴长为230~320 mm,占总数的81.60%。各月渔获物中雄性个体的平均胴长小于雌性个体。胴长与体重关系的生长指数接近3。渔获物中的性比符合1∶1(P>0.05),但成熟个体中雄性个体所占比例明显比雌性高(P<0.05)。渔获物的性腺成熟度以Ⅰ、Ⅱ期为主,雌性个体性腺成熟晚于雄性个体。缠卵腺长和缠卵腺重随着性腺的成熟而逐步增大。渔获物中胴长组成呈双峰型,且未成熟、成熟个体同时存在,由此判断作业海域中柔鱼存在2个种群,即小型的冬春季产卵群体和大型的秋季产卵群体,且以小型的冬春季产卵群体为主。
英文摘要:
      Based on the samples from Chinese squid jigging vessels in the traditional fishing area (150°-165°E,39°-45°N) of northwest Pacific in 2007, the biological characteristics of squid Ommestrephes bartramii were studied. The results showed that the range of mantle length was from 200 to 436 mm and the average mantle length attained 282 mm, the dominant mantle length ranged from 230 to 320 mm which accounted for 81.6 percent of the total. The monthly mantle length of male squid was smaller than that of female, the growth index of relationship between mantle length and body weight was nearly three. The sex ratio of total number accorded with 1∶1(P>0.05), but the proportion of mature males was obviously higher than that of females(P<0.05). The sexual maturity stage dominated Ⅰ and Ⅱ, the average maturity stage of females was less than that of males. The length and weight of nidamental gland of squid increased with the growth of gland maturity. Since the composition of mantle length had two modes in samples and immature and mature individuals both exist, it is concluded that the individuals of the catch could be divided into two populations in the northwest Pacific Ocean, i.e. winter spring cohort with smaller size and autumn spawning cohort with bigger size, in which the winter spring cohort dominated in the catch.
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