SeaDoc Society, Wildlife Health Center, UC Davis School of Veterinary Medicine, 1 Shields Ave., Davis, CA 95616, United States.
Mar Pollut Bull. 2010 Mar;60(3):376-82. doi: 10.1016/j.marpolbul.2009.10.016. Epub 2009 Dec 22.
Derelict fishing gear persists for decades and impacts marine species and underwater habitats. Agencies and organizations are removing significant amounts of derelict gear from marine waters in the United States. Using data collected from repeated survey dives on derelict gillnets in Puget Sound, Washington, we estimated the daily catch rate of a given derelict gillnet, and developed a model to predict expected total mortality caused by a given net based on entanglement data collected upon its removal. We also generated a cost:benefit ratio for derelict gear removal utilizing known true costs compared to known market values of the resources benefiting from derelict gear removal. For one study net, we calculated 4368 crab entangled during the impact lifetime of the net, at a loss of 19,656 dollars of Dungeness crab to the commercial fishery, compared to 1358 dollars in costs to remove a given gillnet, yielding a cost:benefit ratio of 1:14.5.
废弃渔具可以存在数十年之久，对海洋物种和水下生境造成影响。美国的各机构和组织正在从海洋水域中清除大量的废弃渔具。我们利用在华盛顿州普吉特海湾对废弃刺网进行重复调查潜水所收集的数据，估算了特定废弃刺网的日捕捞量，并根据其被移除时收集的缠网数据建立了一个模型，以预测特定网具造成的总死亡数。我们还利用已知的真实成本与废弃渔具清理所带来的资源的已知市场价值，计算了废弃渔具清理的成本效益比。在一项研究中，我们计算出在网具的影响寿命期间有 4368 只螃蟹被缠住，商业渔业因此损失了 19656 美元的邓杰内斯蟹，而移除一个特定刺网的成本为 1358 美元，产生的成本效益比为 1:14.5。
