学术
摘 要:
利用2005年10月至2006年1月印度洋公海撒雅德玛哈浅滩（Saya de Malha Bank）丝尾红钻鱼（Etelis coruscans）延绳钓渔获物生物学测定数据，应用统计及回归方法分别对310尾丝尾红钻鱼的性腺成熟度、性别比例、又长分布、又长与体质量（GW）的关系等进行了研究。结果表明：（1）雄性个体所占比例高于雌性个体，雌性与雄性个体的性别比例为1：2．39；（2）丝尾红钻鱼性腺成熟度以Ⅴ、Ⅵ级为主，Ⅴ级比例最高，占60．80％，其中分性别统计，雌性、雄性丝尾红钻鱼的性腺成熟度皆为Ⅴ级比例最高，分别为52．27％和65．24％，雌性丝尾红钻鱼中性腺成熟度Ⅵ级个体比例（30．68％）远高于雄性样本中性腺成熟度Ⅵ级个体比例（5．71％）；（3）又长分布基本上符合正态分布，优势又长为683～803mm，平均又长为747mm，在同一性腺成熟度时，雌性丝尾红钻鱼的平均又长略大于雄性丝尾红钻鱼的平均又长；（4）根据幂函数回归所得叉长（FL）与体质量（W）的关系式为W=9．4390×10^-6FL^3.0817,其生长指数b值略大于太平洋海域丝尾红钻鱼种群的生长指数b值；（5）雌雄个体又长与体质量关系式比较发现，在又长小于897mm时，雄性个体的体质量大于雌性个体体质量。在叉长大于897mm时，则雌性个体体质量大于雄性个体体质量。[著者文摘]
文章出处:
《中国水产科学》-2008年1期 -79-85页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1005-8737-（2008）01-0079-07
Biological characteristics of ruby snapper （Etelis coruscans） from the bottom longlining in the Saya de Malha bank of the Indian Ocean
XU Liu-xiong, LIN Dong-ming, YE Xu-chang （College of Marine Science ＆ Technology, Shanghai Fisheries University, Shanghai 200090, China）
Abstract:
Etelis coruscans （common English name ruby snapper） is a deepwater species with a depth distribution of 100-450 m. This species is widely distributed throughout the Indo-West Pacific region and most of them are found in the steep drop-off zone surrounding the islands and banks. Due to the reduction of traditional fish resources, Etelis coruscans has become one of the important potential fish species targeted by many commercial fishing fleets because of its high marketing price. With the strict management measures applied in high seas fish resources, such as tuna resources by regional fisheries management organizations, China has paid more attention to potential high sea commercially-valued fish species in order to maintain the sustainable development of its distant water fishery. In 2005, supported by Ministry of Agriculture of China, Lianjiang Deep Sea Fishing Company and Shanghai Fisheries University jointly conducted an exploratory fishing survey on ruby snapper resource in the high seas waters of the Indian Ocean. Based on the biological data of 310 ruby snappers collected from October 2005 to January 2006 by bottom longlining vessels in the Saya de Malha bank of the Indian Ocean, the ruby snapper＇s maturity stages of the gonad, sex ratios, fork length （FL） distributions, relationships between fork length and body weight were analyzed by statistic and regression methods. The results indicated that： （1） there were more males than females, and the ratio of males to females was about 2.39 ： 1 in number; （2） gonad maturity at stages Ⅴ and Ⅵ were dominant with the highest percentage （60.80%） at stage Ⅴ . By separated sex statistic, the highest ratio of gonad maturity of both female and male occurred at stage Ⅴ, with 52.27% and 65.24% respectively, but the ratio of females was distinctly higher than that of males at the gonad maturity stage Ⅵ; （3） the fork length distribution well fit the normal model. The dominant fork length was 683-803 mm, occupying 72.90%, with mean value 747 mm. At the same gonad maturity stage, the mean fork length of female was a little longer than that of male; （4） the relationship between fork length and body weight of ruby snapper could be described as W = 9.439 0 × 10^-6FL^3.0817, with growth index b slightly higher than that of the same relationships regressed from Etelis coruscans in the Pacific Ocean, indicating that ruby snappers in the Indian Ocean and Pacific Ocean possibely did not belong to the same species, or the habitat environment of ruby snappers in the Indian Ocean might be better than that in the Pacific ocean; （5） the body weight of male ruby snapper was heavier than that of the female when FL was less than 897 mm, while the female had heavier body weight if FL was over 897 mm. [Journal of Fishery Sciences of China, 2008, 15 （1） ： 79-85][著者文摘]
Key words:
Etelis coruscans; biological characteristics; Saya de Malha bank; Indian Ocean
基金资助:
农业部远洋渔业探捕项目（上水大科05171）;上海市重点学科建设项目（T1101）.
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