Relationship of farm salmon, sea lice, and wild salmon populations

被引:73
|
作者
Marty, Gary D. [1 ]
Saksida, Sonja M. [2 ]
Quinn, Terrance J., II [3 ]
机构
[1] Univ Calif Davis, Sch Vet Med, Dept Anat Physiol & Cell Biol, Davis, CA 95616 USA
[2] British Columbia Ctr Aquat Hlth Sci, Campbell River, BC V9W 5B1, Canada
[3] Univ Alaska Fairbanks, Juneau Ctr, Sch Fisheries & Ocean Sci, Juneau, AK 99801 USA
关键词
LOUSE LEPEOPHTHEIRUS-SALMONIS; JUVENILE PINK SALMON; ONCORHYNCHUS-GORBUSCHA; PACIFIC SALMON; BRITISH-COLUMBIA; ATLANTIC SALMON; BROUGHTON ARCHIPELAGO; MARINE-ENVIRONMENT; KETA SALMON; CHUM SALMON;
D O I
10.1073/pnas.1009573108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Increased farm salmon production has heightened concerns about the association between disease on farm and wild fish. The controversy is particularly evident in the Broughton Archipelago of Western Canada, where a high prevalence of sea lice (ectoparasitic copepods) was first reported on juvenile wild pink salmon (Oncorhynchus gorbuscha) in 2001. Exposure to sea lice from farmed Atlantic salmon (Salmo salar) was thought to be the cause of the 97% population decline before these fish returned to spawn in 2002, although no diagnostic investigation was done to rule out other causes of mortality. To address the concern that sea lice from fish farms would cause population extinction of wild salmon, we analyzed 10-20 y of fish farm data and 60 y of pink salmon data. We show that the number of pink salmon returning to spawn in the fall predicts the number of female sea lice on farm fish the next spring, which, in turn, accounts for 98% of the annual variability in the prevalence of sea lice on outmigrating wild juvenile salmon. However, productivity of wild salmon is not negatively associated with either farm lice numbers or farm fish production, and all published field and laboratory data support the conclusion that something other than sea lice caused the population decline in 2002. We conclude that separating farm salmon from wild salmon-proposed through coordinated fallowing or closed containment-will not increase wild salmon productivity and that medical analysis can improve our understanding of complex issues related to aquaculture sustainability.
引用
收藏
页码:22599 / 22604
页数:6
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