Marine Mortality of Puget Sound Coho Salmon (<i>Oncorhynchus kisutch</i>)

Mathews, Stephen B.; Buckley, Raymond M.

doi:10.1139/f76-214

Cited by 42 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The survival value of size has been demonstrated for small salmon (e. g . Healey 1982b) and is presumed to exist for larger salmon as well (Mathews and Buckley 1976). The reproductive value of size stems from two factors.…”

Section: Itvmentioning

confidence: 99%

Inter- and Intra-Population Variation in the Fecundity of Chinook Salmon (Oncorhynchus tshawytscha) and its Relevance to Life History Theory

Healey¹,

Heard²

1984

Can. J. Fish. Aquat. Sci.

152

142

View full text Add to dashboard Cite

Healey, M. C., and W. Ra Heard. 1984. Inter-and intra-population variation in the fecundity of chinook salmon (Oneorhynchus tshawytscha) and its relevance to life history theory. Can. ). Fish. Aquat.Sci .4l r 474-483.Chinook salmon (Bwcsrhynehus tshawytscha) varied significantly in fecundity both between years within populations and between populations throughout their range. Generally less than 50% of the variation in fecundity between individuals within populations couid be explained by variation in length. A small additional amount of variation could be attributed to racial differences (e.g. red or white fleshed types) but age, seasonal timing of subpopulations, and stream or ocean type life history pattern did not contribute significantly to variation in fecundity beyond their correlation with length. A great deal of individual variation in fecundity remains to be explained in chinook salmon. The slopes sf the regression of fecundity on length for all populations were low in comparison with other fishes, indicating that fecundity increases slowly with increasing size in chinook. The mean age sf reproducing females varied among populations, and populations that reproduced at an older age were more fecund at a common length than populations that reproduced at a younger age. The increase in fecundity with increasing age of maturity was consistent with theoretical predictions of the trade-off between fecundity and mortality in fish sf reproductive age. The mean age of reproduction within a population, however, was considerably older than the predicted optimum age of reproduction based on the trade-off between increasing fecundity with age and natura! mortality. These observations suggest that chinook have sacrificed fecundity for increased size in the allocation of surplus energy, a life history characteristic that is consistent with the survival value of size in anadromous salmon.

show abstract

Section: Itvmentioning

confidence: 99%

Inter- and Intra-Population Variation in the Fecundity of Chinook Salmon (Oncorhynchus tshawytscha) and its Relevance to Life History Theory

Healey¹,

Heard²

1984

Can. J. Fish. Aquat. Sci.

152

142

View full text Add to dashboard Cite

show abstract

“…Dill, submitted). For juveniles of species such as coho salmon, rapid growth is probably at a premium: after their first year in freshwater, coho typically migrate to sea, and larger smolts may enjoy a higher rate of survival there (Mathews and Buckley 1976;Bilton 1978;Olson 1978;Bilton et al 1982; but see Holtby et al 1990). Juvenile coho should therefore maximize their growth rate in freshwater, and should be particularly sensitive to this trade-off between growth and mortality (Gilliam 1982;Werner and Gilliam 1984).…”

Section: Discussionmentioning

confidence: 99%

Feeding and aggressive behaviours in juvenile coho salmon (Oncorhynchus kisutch) under chemically-mediated risk of predation

Martel

Dill

1993

Behav Ecol Sociobiol

View full text Add to dashboard Cite

Juvenile coho salmon (Oncorhynchus kisutch)spend the first year of their lives in their natal streams, where they may often hold feeding territories. They also face significant risk of predation by birds and fish, and should alter their behaviour to reduce risk of mortality when these predators are present. Although there is laboratory evidence that coho react to predator visual stimuli, chemoreception of avian predator presence has not previously been reported. We tested the influence of chemical stimuli of common merganser (Mergus merganser), preying on juvenile coho, on two aspects of coho territorial behaviour, foraging and aggression, in flowthrough aquaria. After a mixture of merganser-and coho-conditioned water was introduced into the system, juvenile coho significantly reduced their attack distance on drifting prey. The fish also significantly decreased their aggressive behaviour directed towards mirrors (total number of acts, intensity of acts and time spent) when the same odour was present. They did not change their behaviour in either experiment after control introductions of water treated with fish alone. These results are interpreted within the framework of a trade-off between juvenile growth and mortality.

show abstract

“…Many studies point to the first few months of ocean residence as the period in which most ocean mortality occurs (Matthews and Buckley 1976, Bax 1983, Nickelson 1986, Fisher and Pearcy 1988, Holtby et al 1990, Francis and Hare 1994. While the first summer in the ocean is important to survival, the period shortly after ocean entry is perhaps the most critical to cohort survival, and is perhaps the time when cohort success is determined (Pearcy and Fisher 1988, Holtby and Scrivner 1989, Pearcy 1992, Beamish and Boullion 1993.…”

Section: Fall Chinook Salmon Life Historymentioning

confidence: 99%

The Design and Analysis of Salmonid Tagging Studies in the Columbia Basin : Volume XVII : Effects of Ocean Covariates and Release Timing on First Ocean-Year Survival of Fall Chinook Salmon from Oregon and Washington Coastal Hatcheries.

Burgess¹,

Skalski²

2001

View full text Add to dashboard Cite

Marine Mortality of Puget Sound Coho Salmon (Oncorhynchus kisutch)

Cited by 42 publications

References 0 publications

Inter- and Intra-Population Variation in the Fecundity of Chinook Salmon (Oncorhynchus tshawytscha) and its Relevance to Life History Theory

Inter- and Intra-Population Variation in the Fecundity of Chinook Salmon (Oncorhynchus tshawytscha) and its Relevance to Life History Theory

Feeding and aggressive behaviours in juvenile coho salmon (Oncorhynchus kisutch) under chemically-mediated risk of predation

The Design and Analysis of Salmonid Tagging Studies in the Columbia Basin : Volume XVII : Effects of Ocean Covariates and Release Timing on First Ocean-Year Survival of Fall Chinook Salmon from Oregon and Washington Coastal Hatcheries.

Contact Info

Product

Resources

About