globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0088906
论文题名:
Killer Whale Depredation and Associated Costs to Alaskan Sablefish, Pacific Halibut and Greenland Turbot Longliners
作者: Megan J. Peterson; Franz Mueter; Keith Criddle; Alan C. Haynie
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2014
发表日期: 2014-2-18
卷: 9, 期:2
语种: 英语
英文关键词: Killer whales ; Fuels ; Fisheries ; Marine fish ; Alaska ; Sperm whales ; Diesel fuel ; Pilot whales
英文摘要: Killer whale (Orcinus orca) depredation (whales stealing or damaging fish caught on fishing gear) adversely impacts demersal longline fisheries for sablefish (Anoplopoma fimbria), Pacific halibut (Hippoglossus stenolepis) and Greenland turbot (Reinhardtius hippoglossoides) in the Bering Sea, Aleutian Islands and Western Gulf of Alaska. These interactions increase direct costs and opportunity costs associated with catching fish and reduce the profitability of longline fishing in western Alaska. This study synthesizes National Marine Fisheries Service observer data, National Marine Fisheries Service sablefish longline survey and fishermen-collected depredation data to: 1) estimate the frequency of killer whale depredation on longline fisheries in Alaska; 2) estimate depredation-related catch per unit effort reductions; and 3) assess direct costs and opportunity costs incurred by longliners in western Alaska as a result of killer whale interactions. The percentage of commercial fishery sets affected by killer whales was highest in the Bering Sea fisheries for: sablefish (21.4%), Greenland turbot (9.9%), and Pacific halibut (6.9%). Average catch per unit effort reductions on depredated sets ranged from 35.1–69.3% for the observed longline fleet in all three management areas from 1998–2012 (p<0.001). To compensate for depredation, fishermen set additional gear to catch the same amount of fish, and this increased fuel costs by an additional 82% per depredated set (average $433 additional fuel per depredated set). In a separate analysis with six longline vessels in 2011and 2012, killer whale depredation avoidance measures resulted in an average additional cost of $494 per depredated vessel-day for fuel and crew food. Opportunity costs of time lost by fishermen averaged $522 per additional vessel-day on the grounds. This assessment of killer whale depredation costs represents the most extensive economic evaluation of this issue in Alaska to date and will help longline fishermen and managers consider the costs and benefits of depredation avoidance and alternative policy solutions.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0088906&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/19379
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska, United States of America;School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska, United States of America;School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska, United States of America;Resource Ecology and Fisheries Management Division, Alaska Fisheries Science Center, Seattle, Washington, United States of America

Recommended Citation:
Megan J. Peterson,Franz Mueter,Keith Criddle,et al. Killer Whale Depredation and Associated Costs to Alaskan Sablefish, Pacific Halibut and Greenland Turbot Longliners[J]. PLOS ONE,2014-01-01,9(2)
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