Distribution and Migration of Juvenile Chinook Salmon Derived from Coded Wire Tag Recoveries along the Continental Shelf of Western North America

2009 ◽  
Vol 138 (6) ◽  
pp. 1369-1391 ◽  
Author(s):  
M. Trudel ◽  
J. Fisher ◽  
J. A. Orsi ◽  
J. F. T. Morris ◽  
M. E. Thiess ◽  
...  
Keyword(s):  
North America ◽  
Continental Shelf ◽  
Chinook Salmon ◽  
Western North America ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
And Migration

scholarly journals Survival and migration route probabilities of juvenile Chinook salmon in the Sacramento-San Joaquin River Delta during the winter of 2009-10

2012 ◽  
Author(s):  
Russell W. Perry ◽  
Jason G. Romine ◽  
Scott J. Brewer ◽  
Peter E. LaCivita ◽  
William N. Brostoff ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
River Delta ◽  
Migration Route ◽  
Juvenile Chinook Salmon ◽  
San Joaquin River ◽  
Juvenile Chinook ◽  
And Migration

The Ecology of Juvenile Salmon in the Northeast Pacific Ocean: Regional Comparisons

2007 ◽  
Keyword(s):  
Continental Shelf ◽  
Chinook Salmon ◽  
Coho Salmon ◽  
Growing Season ◽  
Juvenile Salmon ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook ◽  
And Storage ◽  
Summer Growth ◽  
Storage Energy

Abstract.—Size-selective mortality combined with longer winters at high-latitudes is expected to exert strong directional selection on size, growth, and energy use and storage capacity in northern fish populations. Here, we tested the hypotheses that juvenile Pacific salmon <em>Oncorhynchus </em>spp. grow faster, reach larger size, and accumulate higher energy reserves in the marine environment at northern latitudes using juvenile Chinook salmon <em>O. tshawystcha </em>and coho salmon <em>O. kisutch </em>collected on the continental shelf from the California coast to the Bering Sea. Size reached at the end of the growing season, the quantity of energy stored prior to the onset of winter, and summer growth of juvenile Chinook and coho salmon during their first year at sea varied significantly among regions of the continental shelf. Latitudinal trends were detected for the fall size of subyearling and yearling Chinook salmon and storage energy in yearling Chinook salmon. However, they were opposite to expectations, with values decreasing from southern to northern areas. Latitudinal trends were also apparent for summer growth in juvenile yearling Chinook salmon. However, in contrast to fall size and storage energy, higher growth rates were generally observed in northern rather than in southern regions. Similarly, summer growth generally decreased from northern to southern regions in juvenile coho salmon. Storage energy did not exhibit a consistent trend with latitude in juvenile subyearling Chinook salmon and coho salmon. The different response of juvenile Chinook salmon and coho salmon to a latitudinal cline in temperature and the length of the growing season suggest that both species utilize the marine environment differently. We suggest that regional variations in juvenile salmon growth and energy accumulation may result from differences in prey quality (i.e., lipids), diet, and interspecific competition for prey resources.

Estimating Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento–San Joaquin River Delta

2010 ◽  
Vol 30 (1) ◽  
pp. 142-156 ◽  
Author(s):  
Russell W. Perry ◽  
John R. Skalski ◽  
Patricia L. Brandes ◽  
Philip T. Sandstrom ◽  
A. Peter Klimley ◽  
...  
Keyword(s):  
Chinook Salmon ◽  
River Delta ◽  
Migration Route ◽  
Juvenile Chinook Salmon ◽  
San Joaquin River ◽  
Juvenile Chinook ◽  
And Migration

Fine-scale taxonomic and temporal variability in the energy density of invertebrate prey of juvenile Chinook salmon Oncorhynchus tshawytscha

2020 ◽  
Vol 655 ◽  
pp. 185-198
Author(s):  
J Weil ◽  
WDP Duguid ◽  
F Juanes
Keyword(s):  
Energy Density ◽  
Chinook Salmon ◽  
Temporal Variability ◽  
Energy Content ◽  
Single Point ◽  
Single Species ◽  
Fine Scale ◽  
Temporal Differences ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

Variation in the energy content of prey can drive the diet choice, growth and ultimate survival of consumers. In Pacific salmon species, obtaining sufficient energy for rapid growth during early marine residence is hypothesized to reduce the risk of size-selective mortality. In order to determine the energetic benefit of feeding choices for individuals, accurate estimates of energy density (ED) across prey groups are required. Frequently, a single species is assumed to be representative of a larger taxonomic group or related species. Further, single-point estimates are often assumed to be representative of a group across seasons, despite temporal variability. To test the validity of these practices, we sampled zooplankton prey of juvenile Chinook salmon to investigate fine-scale taxonomic and temporal differences in ED. Using a recently developed model to estimate the ED of organisms using percent ash-free dry weight, we compared energy content of several groups that are typically grouped together in growth studies. Decapod megalopae were more energy rich than zoeae and showed family-level variability in ED. Amphipods showed significant species-level variability in ED. Temporal differences were observed, but patterns were not consistent among groups. Bioenergetic model simulations showed that growth rate of juvenile Chinook salmon was almost identical when prey ED values were calculated on a fine scale or on a taxon-averaged coarse scale. However, single-species representative calculations of prey ED yielded highly variable output in growth depending on the representative species used. These results suggest that the latter approach may yield significantly biased results.

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