Growth rate and influence of predation risk on territoriality in juvenile coho salmon (Oncorhynchus kisutch)

1996 ◽  
Vol 53 (3) ◽  
pp. 660-669 ◽  
Author(s):  
G Martel
Keyword(s):  
Growth Rate ◽  
Predation Risk ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch

Growth-enhanced transgenic salmon can be inferior swimmers

1997 ◽  
Vol 75 (2) ◽  
pp. 335-337 ◽  
Author(s):  
Anthony P. Farrell ◽  
William Bennett ◽  
Robert H. Devlin
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Coho Salmon ◽  
Swimming Performance ◽  
Oncorhynchus Kisutch ◽  
Transgenic Fish ◽  
Growth Hormone Gene ◽  
Critical Swimming Speed ◽  
Trade Off ◽  
Physiological Fitness

We examined the consequence of remarkably fast growth rates in transgenic fish, using swimming performance as a physiological fitness variable. Substantially faster growth rates were achieved by the insertion of an "all-salmon" growth hormone gene construct in transgenic coho salmon (Oncorhynchus kisutch). On an absolute speed basis, transgenic fish swam no faster at their critical swimming speed than smaller non-transgenic controls, and much slower than older non-transgenic controls of the same size. Thus, we find a marked trade-off between growth rate and swimming performance, and these results suggest that transgenic fish may be an excellent model to evaluate existing ideas regarding physiological design.

Growth of Juvenile Coho Salmon (Oncorhynchus kisutch) off Oregon and Washington, USA, in Years of Differing Coastal Upwelling

1988 ◽  
Vol 45 (6) ◽  
pp. 1036-1044 ◽  
Author(s):  
J. P. Fisher ◽  
W. G. Pearcy
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Coastal Upwelling ◽  
Coho Salmon ◽  
Slow Growth ◽  
Oncorhynchus Kisutch ◽  
Early Summer ◽  
Alternative Prey ◽  
Stomach Fullness ◽  
Poor Condition

Estimated growth rates, condition, and stomach fullness of juvenile coho salmon (Oncorhynchus kisutch) caught in the ocean in early summer, when mortality was most variable, were as high in 1983 and 1984, years of very low survival and low early upwelling, as in 1981, 1982, and 1985, years of higher survival and higher early upwelling. Chronic food shortage leading to starvation, poor condition, or slow growth apparently was not the cause of the increased mortality of juvenile coho salmon in 1983 and 1984. Survival of juvenile coho salmon was positively correlated with purse seine catches of fish in June and with early summer upwelling, 1981–85. Hence, year-class success probably was determined early in the summer, soon after most juvenile coho salmon entered the ocean. Spacing of the first five ocean circuli, which was positively correlated with growth rate, was not significantly different for fish caught early in the summer and those caught late in the summer, suggesting that growth rate selective mortality in the ocean was not strong. The increase in mortality in 1983 and 1984 may have been caused by increased predation on juvenile coho salmon due to decreased numbers of alternative prey for predators.

Trade-off between growth rate and aggression in juvenile coho salmon, Oncorhynchus kisutch

2003 ◽  
Vol 66 (3) ◽  
pp. 561-568 ◽  
Author(s):  
Leif Asbjørn Vøllestad ◽  
Thomas P. Quinn
Keyword(s):  
Growth Rate ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Trade Off

Logging Impacts and Some Mechanisms that Determine the Size of Spring and Summer Populations of Coho Salmon Fry (Oncorhynchus kisutch) in Carnation Creek, British Columbia

1984 ◽  
Vol 41 (7) ◽  
pp. 1097-1105 ◽  
Author(s):  
J. C. Scrivener ◽  
B. C. Andersen
Keyword(s):  
Growth Rate ◽  
British Columbia ◽  
Growth Rates ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Growing Season ◽  
Channel Morphology ◽  
Creek Watershed ◽  
Salmon Fry ◽  
Logging Impacts

Natural patterns in emergence times, seaward movements, instream distributions, densities, and growth of coho salmon fry (Oncorhynchus kisutch) between March and September are contrasted with patterns observed during and after logging in the Carnation Creek watershed. After streamside logging in 1976–77, fry emerged up to 6 wk earlier and moved seaward more quickly than during years before logging. These observations are attributed to higher water temperatures during the winter and to emergence during a period of more frequent freshets. Increased fry movement from the stream could result in habitat being underutilized. In sections affected by intense streamside logging, the deposition of "fine" logging debris led to increased fry densities during the summers of 1977 and 1978. After major freshets in November 1978, which removed this fine debris and affected channel morphology in these sections, fry densities declined below those observed prior to logging. Growth rate of fry was inversely correlated with density in all stream sections. Growth rates, after correction for density, tended to be greater in all sections after the adjacent streamside was logged. Larger fry and more variable numbers of fry remained in the stream in September after logging than before logging. Their increased size is attributed to the longer growing season afforded by earlier emergence. This complex of interacting factors determines the number and size of fry in autumn and it can influence the production of smolts the following spring.

scholarly journals Lunar cycles of coho salmon, Oncorhynchus kisutch. I. Growth and feeding

1987 ◽  
Vol 129 (1) ◽  
pp. 165-178
Author(s):  
K. J. Farbridge ◽  
J. F. Leatherland
Keyword(s):  
Growth Rate ◽  
Coho Salmon ◽  
Slow Growth ◽  
Oncorhynchus Kisutch ◽  
Relative Length ◽  
Lunar Cycle ◽  
Relative Mass ◽  
Cyclic Patterns ◽  
Lunar Cycles ◽  
Salmon Parr

Coho salmon (Oncorhynchus kisutch Walbaum) parrs and smolts, maintained in a laboratory under a fixed artificial 12 h light:12 h dark photoperiod from the time of hatching, exhibited a pattern of alternating periods of rapid and slow growth in body mass; the peaks and troughs in growth rate were significantly different from one another. The alternating growth rate changes were rhythmic in nature, of approximately 14 to 15 days in length. Evidence for cyclic patterns of growth in relative length and in food consumption was also found in coho salmon parr. Peak food intake appeared to occur 2–4 days after each peak of growth in relative mass. Although the pattern of growth in relative length was less clear, there was evidence to suggest that growth in length might be out of phase with growth in mass. There was no pattern of cycling growth rates in coho salmon parr subsampled from a common stock. The significance of this is discussed. The data suggest that the lunar cycle acts as a Zeitgeber for synchronization of the growth rate rhythms.

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