Estimating illegal, unreported and unregulated catch in British Columbia's marine fisheries
Estimating illegal, unreported and unregulated catch in British Columbia's marine fisheries
复制标题
DOI：
10.1016/j.fishres.2005.05.003
复制
发表时间：
2005-09-01
影响因子：
2.4
通讯作者：
Pitcher, TJ
中科院分区：
文献类型：
--
作者：
Ainsworth, CH;Pitcher, TJ
为了充分了解捕捞对海洋环境的影响，有必要对生态系统的总萃取量进行估计。除受管制和监测的名义渔业上岸和报告的丢弃外，清除将包括一定数量的非法、未报告和未管制渔获量(IUU)。如果考虑到这一数字，可能会对我们对库存充裕和安全搬运率的预测产生深远影响。在这里，我们给出不列颠哥伦比亚省鲑鱼和底层鱼船队IUIJ渔获量的初步估计。基于渔业历史的影响和对错误报告的独立估计，我们的方法采用蒙特卡罗程序来确定丢失的渔获量和相关的误差范围。从20世纪50年代到80年代，我们估计，在公元前的鲑鱼和底层鱼渔业中，每年有10,000至20,000吨的渔获量没有记录。IUU渔获量在整个1980年代都在增加，到1990年，这一数量可能接近每年30,000吨，相当于有记录的上岸量的18%。目前，由于更严格的监测和执法，下落不明的渔获量减少：每年约8000吨，占上岸量的6.6%。这里使用这种主观但透明的方法计算的价值，意在为进一步讨论和修改提供一个起点。(C)2005 Elsevier B.V.保留所有权利。
To fully understand the impact of fishing on the marine environment, it is necessary to have an estimate of total extractions from the ecosystem. In addition to nominal fisheries landings and reported discards, which are regulated and monitored, removals will include a certain amount of illegal, unreported and unregulated catch (IUU). This amount, if considered, might profoundly affect our forecasts of stock abundance and safe removal rates. Here, we present preliminary estimates of the quantity of IUIJ catches over time for the British Columbia salmon and groundfish fleets. Based on influences in the history of the fisheries, and on independent estimates of misreporting, our methodology employed a Monte Carlo routine to determine missing catch with an associated error range. From the 1950s to the 1980s, we estimated that between 10,000 and 20,000 tonnes of catch went unrecorded every year in the BC salmon and groundfish fisheries. IUU catch increased throughout the 1980s, and by 1990 the amount was probably closer to 30,000 tonnes per year, equivalent to 18% of recorded landings. At present, less catch is unaccounted for thanks to tighter monitoring and enforcement: about 8000 tonnes per year, or 6.6% of landings. Values calculated here, using this subjective but transparent methodology, are intended to provide a starting point for further discussion and amendment. (c) 2005 Elsevier B.V. All rights reserved.