南太平洋雌性大眼金枪鱼性腺成熟等级研究  

Gonad maturity stage of female bigeye tuna( Thunnus obesus)in the southern Pacific Ocean

作　　者：翟天晨[1] 戴小杰[1] 朱江峰[1] 陈丽雯[1] 

机构地区：[1]上海海洋大学海洋科学学院大洋渔业资源可持续开发省部共建教育部重点实验室,上海201306

出　　处：《南方水产科学》2016年第1期102-110,共9页South China Fisheries Science

基　　金：国家自然科学基金项目(41506151);农业部远洋金枪鱼科学观察员项目(2010-2013)

摘　　要：对2010年~2013年南太平洋海域采集的雌性大眼金枪鱼(Thunnus obesus)卵巢组织样本进行石蜡切片实验,研究其发育特征,鉴定其成熟等级并估算繁殖力。结果显示,卵巢的发育分为未成熟期、成熟前期、成熟后期、排卵期和排卵后期5个阶段;雌性性腺指数范围为0.26~8.58,平均为3.56,随叉长增长而增大;50%成熟叉长为116.32 cm;平均怀卵数为1.09×10~6粒;平均相对繁殖力为20.5粒·g^(-1)。聚类分析显示,因钓获深度不同,2、3期为一类,1、4期为一类,5期独为一类。研究表明,在南太平洋海域,大眼金枪鱼初次性成熟年龄比其他海域提前,可能是受过度捕捞的影响。We applied paraffin section method to investigate the reproductive features for female bigeye tuna（ Thunnus obesus） in the southern Pacific Ocean（ SPO）,using ovarian tissues sampled at sea during 2010 ~ 2013. Maturity stage and fecundity were estimated under a microscope. The results show that the development of ovary was divided into five stages： 1（ immature）,2（ maturing α）,3（ maturing β）,4（ ovulating） and 5（ ovulated）. Female gonad somatic index（ GSI） ranged from 0. 26 to 8. 58（ average 3. 56）,increasing with the increase of fork length. Length at 50% maturity was 116. 32 cm. Average batch fecundity was 1. 09 × 106 pcs,and average relative fecundity was 20. 5 pcs·g^（-1）. Cluster analysis shows that there were three classes in terms of similarity in catch depth,i. e.,Stages 2 and 3,Stages 1 and 4,and Stage 5. It is suggested that bigeye tuna reached first sexual maturity at earlier ages in SPO than in other areas,probably due to overfishing.

关 键 词：大眼金枪鱼 石蜡切片 性腺成熟等级 南太平洋 

分 类 号：S931[农业科学—渔业资源]