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首页> 外文期刊>Turkish Journal of Fisheries & Aquatic Sciences >Biological Aspects of Swordfish, Xiphias gladius Linnaeus, 1758, Caught During Tuna Longline Survey in the Indian Seas
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Biological Aspects of Swordfish, Xiphias gladius Linnaeus, 1758, Caught During Tuna Longline Survey in the Indian Seas

机译：在印度洋的金枪鱼延绳钓调查中发现的剑鱼的生物学特征，剑鱼（Xiphias gladius Linnaeus，1758年）

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摘要

Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were investigated by analyzing the data gathered during tuna longline surveys conducted by the Fishery Survey of India (PSI). Study undertaken during the period from 2004 to 2010 revealed swordfish Catch Per Unit Effort of 0.02 numbers in 100 hooks from the Arabian Sea; 0.01 from Bay of Bengal and 0.02 form the Andaman and Nicobar waters. About 16% of the specimens caught were juveniles and the sex ratio of smaller fishes was in favour of males, whereas, larger specimens were mostly females. Length-weight relationship established indicated slightly positive allometric growth of the species and length based models revealed difference in growth between sexes. The growth parameters estimated for females were: asymptotic length (L infinity) = 311.11 cm, growth coefficient (K) = 0.17/yr and age at zero length (t(0)) = -0.53 yr, whereas, the growth parameters estimated for males were: L infinity = 243.79 cm, K = 0.22/yr and t(0) = -0.37 yr. Diet was dominated by finfishes and cephalopods, while crustaceans were recorded rarely. Sthenoteuthis oualaniensis was the dominant prey species, followed by Paralepis sp. Spawning area was identified in the Lakshadweep waters from where mature females with hydrated oocytes were caught during December to April. Size at 50% maturity for females was estimated at 164.03 cm, which is reached at about four years of age. Mean batch fecundity was 4.5 million, while the relative fecundity was 37.5 hydrated oocytes per gram of body weight and the diameters of mature oocytes were in the range of 0.9-1.6 mm. Our results provide preliminary information on the abundance, growth and biology of this species in the Indian seas which should be useful to fishery managers.
机译：通过分析印度渔业调查局（PSI）进行的金枪鱼延绳钓调查收集的数据，调查了印度洋剑鱼（Xiphias gladius）的分布，丰度和生物学。 2004年至2010年期间进行的研究表明，箭鱼在来自阿拉伯海的100个鱼钩中的单位捕捞量为0.02。来自孟加拉湾的0.01和形成安达曼和尼科巴水域的0.02。捕获的标本中约有16％是幼鱼，较小的鱼类的性别比有利于雄性，而较大的标本多数为雌性。建立的长度-重量关系表明该物种的异形生长略为正，而基于长度的模型揭示了性别之间的生长差异。为雌性估计的生长参数为：渐近长度（L无限）= 311.11 cm，生长系数（K）= 0.17 / yr和零长度时的年龄（t（0））= -0.53年，而为男性为：L无限= 243.79厘米，K = 0.22 /年，t（0）= -0.37年。饮食以鳍鱼和头足类动物为主，而甲壳类动物很少见。 Sualnoteuthis oualaniensis是主要的猎物，其次是Paralepis sp。在Lakshadweep水域中确定了产卵区域，在12月至4月期间捕获了成熟的雌性卵母细胞。女性成熟度为50％时的大小估计为164.03厘米，大约在四岁时达到。平均批量繁殖力为450万，而相对繁殖力为每克体重37.5个水合卵母细胞，成熟卵母细胞的直径在0.9-1.6 mm范围内。我们的结果提供了有关印度洋中该物种的丰度，生长和生物学的初步信息，这对渔业管理人员应该是有用的。

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