scholarly journals Acoustic Assessment of North Pacific Salmon Stocks

1973 ◽  
Vol 53 (1) ◽  
pp. 354-354
Author(s):  
W. C. Acker
Keyword(s):  
North Pacific ◽  
Pacific Salmon

scholarly journals Pacific salmon abundance trends and climate change

2011 ◽  
Vol 68 (6) ◽  
pp. 1122-1130 ◽  
Author(s):  
James R. Irvine ◽  
Masa-aki Fukuwaka
Keyword(s):  
Climate Change ◽  
Pacific Ocean ◽  
North Pacific ◽  
Sockeye Salmon ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
The North ◽  
Abundance Trends

Abstract Irvine, J. R., and Fukuwaka, M. 2011. Pacific salmon abundance trends and climate change. – ICES Journal of Marine Science, 68: 1122–1130. Understanding reasons for historical patterns in salmon abundance could help anticipate future climate-related changes. Recent salmon abundance in the northern North Pacific Ocean, as indexed by commercial catches, has been among the highest on record, with no indication of decline; the 2009 catch was the highest to date. Although the North Pacific Ocean continues to produce large quantities of Pacific salmon, temporal abundance patterns vary among species and areas. Currently, pink and chum salmon are very abundant overall and Chinook and coho salmon are less abundant than they were previously, whereas sockeye salmon abundance varies among areas. Analyses confirm climate-related shifts in abundance, associated with reported ecosystem regime shifts in approximately 1947, 1977, and 1989. We found little evidence to support a major shift after 1989. From 1990, generally favourable climate-related marine conditions in the western North Pacific Ocean, as well as expanding hatchery operations and improving hatchery technologies, are increasing abundances of chum and pink salmon. In the eastern North Pacific Ocean, climate-related changes are apparently playing a role in increasing chum and pink salmon abundances and declining numbers of coho and Chinook salmon.

Testing mechanistic explanations of observed correlations between environmental factors and marine fisheries

2001 ◽  
Vol 58 (1) ◽  
pp. 208-219
Author(s):  
A E Gargett ◽  
M Li ◽  
R Brown
Keyword(s):  
Environmental Factors ◽  
Coastal Waters ◽  
North Pacific ◽  
Pacific Salmon ◽  
Mechanistic Explanation ◽  
Marine Fisheries ◽  
Predictive Tool ◽  
Mechanistic Explanations ◽  
The North ◽  
The North Pacific

Based on observed correlations, marine fisheries are often hypothesized to depend on environmental factors. Since correlations are unreliable as a predictive tool, it is desirable to seek mechanistic explanations for observed correlations. This paper considers methods available for testing such mechanistic explanations. As a specific example, we consider the optimal stability window, proposed as a mechanistic explanation of observed correlations between the survival of North Pacific salmon stocks and the state of the atmosphere over the North Pacific in winter, as applied to the coastal waters and fisheries of southern British Columbia, Canada.

Modeling spatiotemporal trends in the productivity of North Pacific Salmon

2012 ◽  
Vol 24 (1) ◽  
pp. 31-40
Author(s):  
Oksana Chkrebtii ◽  
Jiguo Cao
Keyword(s):  
North Pacific ◽  
Pacific Salmon ◽  
Spatiotemporal Trends

A review of size trends among North Pacific salmon (Oncorhynchus spp.)

1996 ◽  
Vol 53 (2) ◽  
pp. 455-465 ◽  
Author(s):  
Brian S Bigler ◽  
David W Welch ◽  
John H Helle
Keyword(s):  
North Pacific ◽  
Pacific Salmon

Upper thermal limits on the oceanic distribution of Pacific salmon (Oncorhynchus spp.) in the spring

1995 ◽  
Vol 52 (3) ◽  
pp. 489-503 ◽  
Author(s):  
D. W. Welch ◽  
A. I. Chigirinsky ◽  
Y. Ishida
Keyword(s):  
North Pacific ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Fish Fauna ◽  
Additive Models ◽  
Direct Result ◽  
Southern Boundary ◽  
Subarctic Pacific ◽  
Thermal Limits ◽  
The North

Pacific salmon are normally thought to be distributed throughout the Subarctic Pacific, an area where they form the dominant fish fauna. We use a series of generalized additive models to show that salmon exhibit a sharp step-function response to temperature in the oceanic eastern north Pacific in spring. The critical temperature defining the southern boundary varied by species: 10.4 °C for pink and chum salmon, 9.4 °C for coho salmon, and 8.9 °C for sockeye salmon. These thermal limits occur well to the north of the southern boundary of the Transition Zone, at widely separated geographic positions within the Subarctic Domain, and at temperatures much lower than the lethal upper limit for each species. The sharp decline in abundance with temperature, and the remarkably low temperatures at which the response occurs, suggests that thermal barriers form an effective limit to the offshore distribution of salmon in spring, and can limit the distribution of Pacific salmon to a relatively small area of the Subarctic Pacific. The strength of this response is presumably the direct result of strong evolutionary selection. Future temperature changes in the North Pacific could therefore have a direct impact on the production dynamics of Pacific salmon.

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