• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Fishery and stock assessment of the three-spot swimming crab Portunus sanguinolentus (Herbst, 1783) off Veraval, Gujarat
【2h】

Fishery and stock assessment of the three-spot swimming crab Portunus sanguinolentus (Herbst, 1783) off Veraval, Gujarat

机译：在古吉拉特邦Veraval附近的三点游泳螃蟹portunus sanguinolentus（Herbst，1783）的渔业和库存评估

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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∞, K and t0 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 (LM50) 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 (Ecur) was found to be 0.61 which is equal to E0.1 estimated by Beverton and Holt yield per recruit analysis. Thompson and Bell bio-economic analysis showed that species 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。年平均登陆量为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。估计的L∞，K和t0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）分别估计为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（LM50）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。发现当前的开采率（Ecur）为0.61，等于Beverton和Holt每招募人员分析得出的E0.1。汤普森和贝尔的生物经济分析表明，可以在目前水平上开发物种，以将渔业收入保持在经济水平上。

著录项

相似文献

  • 外文文献
  • 专利

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号