Fishery biology of purpleback squid, Sthenoteuthis oualaniensis, in the northwest Indian Ocean
Fishery biology of purpleback squid, Sthenoteuthis oualaniensis, in the northwest Indian Ocean
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DOI：
10.1016/j.fishres.2006.09.005
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发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Zhao Xiaohu
中科院分区：
文献类型：
--
作者：
Chen Xinjun;Liu Bilin;Zhao Xiaohu
2003年9月和11月以及2004年9月至2005年4月，在西北印度洋4°N-21°N、58°E-65°E海域，用中国鱿鱼跳绳渔船对紫背鱿鱼资源进行了3次调查。日渔获量在0.1 ~ 36.0 t/d之间，以北纬15°N-18°和东经60°E-62°、北纬18°N-20°和东经62°30°E-64°为主要渔获区，总渔获量性别比（M:F）为1:30.5。雄性平均地幔长度为299 mm (106 ~ 462 mm)，雌性平均地幔长度为352 mm （106 ~ 612 mm）。确定了三个不同大小的独立群体：大于400 mm ML的群体位于北纬18度以北；在12°N ~ 18°N区域鱿鱼的大小在300 ~ 400 mm ML之间，在12°N以南小于300 mm ML的鱿鱼大小在经度方向上没有系统差异。雌性和雄性体重（BW, g）与地幔长度（mm）的关系分别为BW = 40.64348 ML2.9115和BW = 45.78507 ML2.5842。在北纬16度以南海域，70%以上的雌鱼未成熟，北纬18度以北海域，48%以上的雌鱼未成熟。同一成熟期鱿鱼的大小变化很大，表明S. oualaniensis可以全年产卵。2004年9月至2005年4月最老的鱿鱼年龄略小于1岁，表明所有被检查的个体都是在2004年1月至11月孵化的。产卵高峰期为3月至5月。大多数被分析的胃都有食物残留，只有8%的胃是空的。胃中有三大类：鱼类、头足类和甲壳类，主要有cyselurus spp和S. oualaniensis。超过60%的体积大于400毫米的鱿鱼的胃有同类相食的证据。(c) 2006 Elsevier B.V.版权所有。
Three surveys of purpleback squid (Sthenoteuthis oualaniensis) resource were carried out by Chinese squid jigging boats in the waters of 4 degrees N-21 degrees N, 58 degrees E-65 degrees E in the northwestern Indian Ocean during September and November 2003, and from September 2004 to April 2005. The daily catch ranged from 0.1 t/days to 36.0 t/days, with majority of the catch from areas defined by 15 degrees N-18 degrees N and 60 degrees E-62 degrees E, and by 18 degrees 30'N-20 degrees N and 62 degrees 30'E-64 degrees E. The sex ratio (M:F) for the total catch was 1:30.5. The mean mantle length (ML) was 299 mm for males (range 106-462 mm) and 352 mm for females (range 106-612 mm). Three separate groups with different sizes were identified: those larger than 400 mm ML located in the north of 18 degrees N; squid ranging 300-400 mm ML in the area from 12 degrees N to 18 degrees N, and those shorter than 300 mm ML in the south of 12 degrees N. There was no systematic difference in squid size along the longitude direction. The relationship between body weight (BW, g) and mantle length (mm) was quantified by BW = 40.64348 ML2.9115 and BW = 45.78507 ML2.5842 for females and males, respectively. In the waters south of 16 degrees N, more than 70% of females were immature, while in the area north of 18 degrees N, more than 48% were mature. Squid in the same maturity stage varied greatly in size, suggesting that S. oualaniensis may spawn all year around. The oldest squid from September 2004 to April 2005 were slightly younger than I year old, suggesting that all the examined individuals were hatched during January and November 2004. The peak spawning time is from March to May. Most of the stomachs analyzed had food remains and only 8% were empty. The stomachs contained three major groups: fish, cephalopods and crustaceans, mainly Cypselurus spp and S. oualaniensis. More than 60% of the stomachs had evidence of cannibalism for the squid larger than 400 mm ML. (c) 2006 Elsevier B.V. All rights reserved.