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首页> 外文期刊>Indian Journal of Fisheries >Fishery and stock assessment of the three-spot swimming crab Portunus sanguinolentus (Herbst, 1783) off Veraval, Gujarat
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Fishery and stock assessment of the three-spot swimming crab Portunus sanguinolentus (Herbst, 1783) off Veraval, Gujarat

机译：古吉拉特邦韦拉瓦尔附近三点游泳梭子蟹Portunus sanguinolentus（Herbst，1783）的渔业和种群评估

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摘要

The fishery and stock characteristics of Portunus sanguinolentus was studied during 2009-2010 from Veraval waters. The average annual landing was 322 t, which constituted about 40% of the total edible crab landings at Veraval. Length-weight relationship showed isometric growth. L_(ro) K and t_0 estimated were 178.7 mm, 1.2 yr~(-1) and -0.08 yr, respectively. Total mortality rate (Z), fishing mortality rate (F) and natural mortality rate (M) were estimated to be 4.69 yr~(-1), 2.85 yr~(-1) and 1.84 yr~(-1), respectively. The estimated length at capture (L50) and length at maturity (LM_(50)) were 101.33 mm and 96.89 mm, respectively, indicating that the crabs enter into peak exploitation phase after attaining sexual maturity. The species is a continuous spawner and shows peak recruitment during May and August. The current exploitation rate (E_(cur)) was found to be 0.61 which is equal to E_0, estimated by Beverton and Holt yield per recruit analysis. Thompson and Bell bio-economic analysis showed thatspecies can be exploited at the present level to maintain the revenue from the fishery at economic level.
机译：在2009年至2010年期间，从Veraval水域研究了Portunus sanguinolentus的渔业和种群特征。年均登陆量为322吨，约占Veraval食用蟹总登陆量的40％。长度与体重的关系显示出等距增长。 L_（ro）K和t_0估计分别为178.7 mm，1.2 yr〜（-1）和-0.08 yr。总死亡率（Z），捕捞死亡率（F）和自然死亡率（M）估计分别为4.69 yr〜（-1），2.85 yr〜（-1）和1.84 yr〜（-1）。估计捕获时的长度（L50）和成熟时的长度（LM_（50））分别为101.33 mm和96.89 mm，这表明螃蟹在达到性成熟后进入高峰利用阶段。该物种是一个连续的产卵场，并在5月和8月显示出峰值的募集。通过Beverton和Holt每名新兵分析估计，当前的开采率（E_（cur））为0.61，等于E_0。汤普森和贝尔的生物经济分析表明，可以在目前的水平上开发物种，以将渔业收入保持在经济水平上。

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