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首页> 外文期刊>Indian Journal of Fisheries >Population dynamics of Trichiurus lepturus (Linnaeus, 1758) off Veraval
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Population dynamics of Trichiurus lepturus (Linnaeus, 1758) off Veraval

机译：维拉瓦尔对岸的Trichiurus lepturus（Linnaeus，1758）的种群动态

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摘要

Population dynamics of the ribbonfish, Trichiurus lepturus, was studied from April 2008 to March 2009 along Veraval coast (lat. N 20 degrees 54'912" and long. E 70 degrees 21'355"). Ribbonfishes are exploited mostly by trawls throughout the year with peak catch from September to December. The mean length of T lepturus in trawls was 76.47 cm. The asymptotic length, growth coefficient and age at zero length were 131.25 cm, 0.13 and -0.0777 years, respectively. The growth performance index was 3.35. Recruitment pattern was trimodal with peak during May to July. The length of recruitment was 27 cm. Total, natural and fishing mortalities were 0.44, 0.13 and 0.31. The exploitation rate and ratio of exploitation were 0.30 and 0.105. The annual total stock, biomass and MSY were 1,91,935 t, 1, 55,277 t and 34,161 t, respectively. Yield and yield per recruit at present fishing effort were 23,682.5 t and 65.13 g, indicating the ribbonfish stock along Veraval coast is underexploited. The fishing pressure can be increased by 120% to obtain maximum yield and biomass
机译：研究了2008年4月至2009年3月沿Veraval海岸（纬度N 20度54'912“和纬度E 70度21'355”）355鱼Trichiurus lepturus的种群动态。鱼全年主要被拖网捕捞，九月至十二月的捕捞高峰。拖网中的T lepturus平均长度为76.47 cm。渐近长度，生长系数和零长度年龄分别为131.25 cm，0.13和-0.0777年。生长表现指数为3.35。招聘模式为三峰模式，并在5月至7月达到顶峰。募集的长度为27厘米。总死亡率，自然死亡率和捕捞死亡率分别为0.44、0.13和0.31。剥削率和剥削率分别为0.30和0.105。年总库存量为1,91,935 t，生物量为1,55,277 t，MSY为34,161 t。在目前的捕捞努力下，每人的产量和单产分别为23,682.5 t和65.13 g，这表明沿Veraval海岸的the鱼资源未得到充分利用。捕捞压力可以增加120％，以获得最大的产量和生物量

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