Pelagic shark fisheries along the west coast of the United States and Baja California, Mexico
Pelagic shark fisheries along the west coast of the United States and Baja California, Mexico
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DOI：
10.1016/s0165-7836(98)00178-7
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发表时间：
1998-12-15
影响因子：
2.4
通讯作者：
Bartoo, NW
中科院分区：
文献类型：
--
作者：
Holts, DB;Julian, A;Bartoo, NW
以板鳃类资源为目标的渔业在过去20年中经历了急剧增长。全世界的软骨鳃类上岸量每年超过60万公吨，显然对该资源的一部分产生了重大影响。在北太平洋东部，普通长尾鲨、灰鲭鲨和大青鲨的年捕获量可能超过15000公吨。在这一地区捕获的鲨鱼中，近90%都是未成熟的。像大多数鲨鱼一样，这些中上层鱼类的增长率很低，这使得它们很容易受到现代捕鱼压力的影响。显然，从任何种群中清除大部分青少年都有可能使成年种群减少到不可持续的水平。种群从过度开发中恢复的能力不仅取决于初始种群规模、自然死亡率和迁移率，而且还取决于减少总的捕捞死亡率。特殊利益集团颁布的条例只使一部分资源使用者受益，再加上缺乏生物信息，减缓了实现合理管理的进展。(C)1998 Elsevier Science B.V，保留所有权利。
Fisheries targeting elasmobranch resources have experienced a dramatic growth during the past two decades. World-wide elasmobranch landings exceed 600 000 metric tons (mt) annually and have clearly made a significant impact on portions of that resource. In the eastern north Pacific catches of common thresher, shortfin mako and blue sharks may exceed 15 000 mt annually. Nearly 90% of all sharks taken within this area are immature. Like most sharks, these pelagics have low rates of increase which make them quite vulnerable to modem day fishing pressure. Clearly the removal of large segments of juveniles from any population has the potential to decrease the adult population to unsustainable levels. The ability of populations to recover from over-exploitation depends not only on initial stock size, natural mortality, and migration rates, but also upon reducing total fishing mortality. Regulations enacted by special interest groups benefiting only one segment of the resource users, combined with the lack of biological information, have slowed progress towards achieving rational management. (C) 1998 Elsevier Science B.V, All rights reserved.