Spatial and temporal factors affecting survival in coho salmon (Oncorhynchus kisutch) in the Pacific Northwest

被引:79
作者
Coronado, C [1 ]
Hilborn, R [1 ]
机构
[1] Univ Washington, Fisheries Res Inst, Seattle, WA 98195 USA
关键词
D O I
10.1139/cjfas-55-9-2067
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Survival rates for coho salmon (Oncorhynchus kisutch) were estimated for all coded wire tag release groups in the Pacific Northwest between 1971 and 1990. The spatial and temporal patterns show considerable geographic variation, with most regions south of northern British Columbia showing declining survival since 1983, while northern areas have shown increasing survival during that period. The number of years of operation explained very little of the variation in survival, and many hatcheries showed major increases in survival after several years of operation. Survival of marked wild fish generally showed the same trend as hatchery fish. We conclude that the dominant factor affecting coho salmon survival since the 1970s is ocean conditions and that there are major geographic differences in the pattern of ocean conditions. The decline in survival seen in British Columbia and south over the last decade suggests that a major reduction in exploitation rates is necessary to maintain the populations.
引用
收藏
页码:2067 / 2077
页数:11
相关论文
共 24 条
[21]  
PEARCY WG, OCEAN ECOLOGY N PACI, P92
[22]   EXPERIMENTAL MANAGEMENT OF OREGON COHO SALMON (ONCORHYNCHUS-KISUTCH) - DESIGNING FOR YIELD OF INFORMATION [J].
PETERMAN, RM ;
ROUTLEDGE, RD .
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1983, 40 (08) :1212-1223
[23]  
Ware D. M., 1989, Can. Spec. Publ. Fish. Aquat. Sci, V108, P359
[24]  
*WDF, 1991, 115 WASH DEP FISH GE