...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Indian Journal of Fisheries >Fishery and population dynamics of Protonibea diacanthus (Lacepede) and Otolithoides biauritus (Cantor) landed by trawlers at Vanakbara, Diu along the west coast of India
【24h】

Fishery and population dynamics of Protonibea diacanthus (Lacepede) and Otolithoides biauritus (Cantor) landed by trawlers at Vanakbara, Diu along the west coast of India

机译：拖网渔船登陆印度西海岸迪乌瓦纳克巴拉的Protonibea diacanthus（Lacepede）和Otolithoides biauritus（Cantor）的渔业和种群动态

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The fishery and population characteristics of larger sciaenids Protonibea diacanthus (Lacepede) and Otolithoides biauritus (Cantor) landed by trawlers at Vanakbara, Diu were studied for the period 2003 - 2007. The average annual catch of P. diacanthus was 770.6 t and that of O. biauritus was 1018.6 t, together contributing 12% to the total trawl catch at Vanakbara. Majority of the larger sciaenids were landed during September - December. The von Bertalanffy growth equation was L-t = 145.3 [1 - e(-0.14 (t+0.0738))] for P. diacanthus and L-t = 160 [1 - e(-0.19) ((t+0.0638))] for O. biauritus. The mortality rates M, F and Z computed for P. diacanthus were 1, 0.30 and 0.61 and for O. biauritus were 7, 0.33 and 0.70. The exploitation ratio (E) was 0.49 for P. diacanthus and 0.47 for O. biauritus. A maximum increase in relative yield by 2.7% for P. diacanthus could be realized by decreasing the present level of fishing by 20%, while for O. biauritus the present fishing effort is at optimum level.
机译：研究了拖网渔民在Diu的Vania捕鱼的较大的刺骨鱼（Protonibea diacanthus（Lacepede）和Otolithoides biauritus（Cantor））的渔业和种群特征，2003年至2007年。P。diacanthus的年平均捕捞量为770.6 t，O鱼为1018.6吨，占Vanakbara拖网总捕捞量的12％。 9月至12月期间，大多数较大的坐骨神经痛降落。百日草的von Bertalanffy生长方程为Lt = 145.3 [1- e（-0.14（t + 0.0738））]，O为Lt = 160 [1- e（-0.19）（（t + 0.0638））]。双性恋。计算出的P. diacanthus的死亡率M，F和Z为1、0.30和0.61，O。biauritus的死亡率为7、0.33和0.70。百日草（P. diacanthus）的剥削率（E）为0.49，而双歧猪（O. biauritus）的剥削率为（E）0.47。通过将目前的捕捞水平降低20％，可以使P. diacanthus的相对产量最大提高2.7％，而对于O. biauritus，目前的捕捞努力处于最佳水平。

著录项

相似文献

  • 外文文献
获取原文

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