Fishery observers address arctic fishery discards

Fishery observers address arctic fishery discards
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渔业观察员处理北极渔业丢弃物问题

DOI:
10.1088/1748-9326/aba57d
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发表时间:
2020
影响因子:
6.7
通讯作者:
Erbaugh, James T
Erbaugh, James T
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Snyder, Hunter T;Erbaugh, James T

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渔业观察员是全球努力减少渔业弃鱼的主要行动者,但他们的效力如何仍有很大的不确定性。我们分析了格陵兰岛所有大型渔业五年半(2012-2018年)的高分辨率日志记录(n= 127 415),以确定船上渔业观察员是否影响强制性报告丢弃物。为了做到这一点,我们使用精确匹配来比较观察到的和未观察到的捕获量(每次记录捕获量)的报告丢弃量,从而控制监测和未监测做法之间的系统差异。在调整了代表捕获的物种,齿轮,船只,所有者,年份,许可证和位置的变量后,我们发现,当船上没有观察员时,船长系统地少报丢弃物。与以往研究中的理论论点相反,系统性少报在价值较低的渔业中最为明显。观察到的和未观察到的捕捞所报告的弃鱼之间的差异使我们假设船上的观察员鼓励更忠实的日志记录。因此,船上观察员在改进关于捕鱼对环境影响的信息方面发挥着至关重要的作用,并反过来对可持续渔业管理作出重要贡献。
Fishery observers are prevalent actors in the global effort to reduce discards in fisheries, but there remains considerable uncertainty about how effective they are. We analyzed high-resolution logbook records of individual hauls (n= 127 415) across five-and-a-half-years (2012–2018) for all of Greenland's large-scale fisheries to determine if onboard fishery observers influence the mandatory reporting of discards. To do so, we used exact matching to compare reported discards for observed and unobserved hauls (each time a catch is recorded), thus controlling for systematic differences between monitored and unmonitored practices. After adjusting for variables that represent species caught, gear, vessel, owner, year, license, and location, we found that skippers systematically underreport discards when no observers are on board. Systematic underreporting was most pronounced in less valuable fisheries, in contrast to theoretical arguments in previous studies. The differences between reported discards from observed and unobserved fishing leads us to assume that onboard observers encourage more faithful logbook records. Thus, onboard observers play a vital role in improving information on the environmental impact of fishing and in turn, make a key contribution to sustainable fisheries management.
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