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The views and opinions expressed or implied in this article are those of the author (or authors) and do not necessarily reflect the position of the National Marine Fisheries Service, NOAA. Abstract—Seasonal and annual marine growth of chum salmon (Oncorhynchus keta) from Fish Creek, Alaska, during 1972–2004 and from Quilcene River, Washington, during 1973–2004 were examined in relation to abundances of chum salmon and pink salmon (O. gorbuscha) and climate indices from that period. Pink salmon abundance indices were included in the analysis because of evidence for density-dependent effects on chum salmon growth and survival. In linear regression models, growth was negatively related to abundance of chum salmon or to the combined abundance of pink and chum salmon during the middle juvenile (July–Sept), 1st immature, 2nd immature, and maturing stages for the Fish Creek chum salmon and the 1st immature, 2nd immature, and maturing stages for Quilcene River chum salmon, indicating possible density-dependent effects on growth. Mid-juvenile and maturing growth models for the Fish Creek chum salmon and the maturing growth model for Quilcene River chum salmon performed well in model validation, when model predictions were tested against 20% of the data that were not used for model specification, and provided insight into the effects of climate and abundance on growth of chum salmon from 1972 to 2004. Over the last century, the quantity of chum salmon (Oncorhynchus keta) and pink salmon (O. gorbuscha) available for harvest in North America has fluctuated on a multidecadal scale with harvest peaks in the 1930s and the 1990s and lows in the 1950s, 1960s, and 1970s (Eggers et al.1; Ruggerone et al. 2010). From the mid1970s to the mid-1990s, increases in salmon production were attributed to a combination of causes: namely of hatchery supplementation (Eggers, 2009), increased survival of wild stocks due to favorable ocean conditions (Beamish and Bouillon, 1993; Francis and Hare 1994; Hare and Francis, 1995; Hilborn and Eggers, 2000; Morita et al., 2006), and improved management of wild stocks (Wertheimer, 1997). Concurrent with increases in

Effect of population abundance and climate on the growth of 2 populations of chum salmon (Oncorhynchus keta) in the eastern North Pacific Ocean