Movements of Coho Salmon (Oncorhynchus kisutch) Fingerlings in a Stream Following Marking with a Vital Stain

1983 ◽  
Vol 40 (8) ◽  
pp. 1318-1319 ◽  
Author(s):  
J. H. Mundie ◽  
R. E. Traber
Keyword(s):  
Population Size ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
High Density ◽  
Population Estimates ◽  
Side Channel ◽  
Vital Stain

For population estimates we used a vital stain on nine occasions throughout two winters to mark coho salmon (Oncorhynchus kisutch) fingerlings living at high density in a side-channel of a river. On recapture 2–3 d after staining the marked fish were fairly evenly distributed in the channel on one occasion only; on three occasions (at 5 °C or higher) they showed conspicuous upstream movements, and on five occasions (below 5 °C) downstream movements. Such changes in distribution should be taken into account in the estimation of population size.

Effects of Gravel Size, Egg Depth, and Egg Density on Intragravel Movement and Emergence of Coho Salmon (Oncorhynchus kisutch) Alevins

1970 ◽  
Vol 27 (7) ◽  
pp. 1191-1199 ◽  
Author(s):  
L. M. Dill ◽  
T. G. Northcote
Keyword(s):  
Environmental Variables ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
High Density ◽  
Low Density ◽  
Gravel Size ◽  
Egg Density ◽  
The Mean

In experimental aquaria with large gravel (3.2–6.3 cm), vertical and lateral movements of coho salmon (Oncorhynchus kisutch) alevins were more extensive and area utilized per alevin was greater than in small gravel (1.9–3.2 cm). At low density (50 per aquarium) the alevins moved farther towards the inlet, but the mean area occupied per alevin was the same as that at high density (100 per aquarium). Burial depths tested (20 and 30 cm) had no significant effect on vertical or lateral movements or on area utilized per alevin. Alevin orientation in the gravel, survival to emergence, and timing of emergence were not affected by any of the environmental variables examined.

Egg Proteins of Coho Salmon (Oncorhynchus kisutch): Chromatographic Separation and Molecular Weights of the Major Proteins in the High Density Fraction and their Presence in Salmon Plasma

1971 ◽  
Vol 28 (12) ◽  
pp. 1853-1856 ◽  
Author(s):  
J. R. Markert ◽  
W. E. Vanstone
Keyword(s):  
Chromatographic Separation ◽  
Coho Salmon ◽  
Soluble Fraction ◽  
Oncorhynchus Kisutch ◽  
High Density ◽  
Density Fraction ◽  
Molecular Weights ◽  
Egg Protein

The molecular weights of the three major proteins in the soluble fraction of coho salmon (Oncorhynchus kisutch) eggs were found to be: lipovitellin, 390,000; β′-component, 30,000; and phosvitin, 27,000. Immunological techniques showed that these proteins were present in the plasma of sexually maturing female coho and of estrogenized prepuberal coho of both sexes but not of sexually maturing males or nonestrogenized prepuberal coho. These findings support the previous postulation that the β′-component should be classified not as a livetin but as an egg protein, as are lipovitellin and phosvitin.

Inbreeding and effective population size in a coho salmon (Oncorhynchus kisutch) breeding nucleus in Chile

Aquaculture ◽  
2014 ◽  
Vol 420-421 ◽  
pp. S15-S19 ◽  
Author(s):  
José M. Yáñez ◽  
Liane N. Bassini ◽  
Michael Filp ◽  
Jean P. Lhorente ◽  
Raúl W. Ponzoni ◽  
...  
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Effective Population

Family Size and Effective Population Size in a Hatchery Stock of Coho Salmon (Oncorhynchus kisutch)

1986 ◽  
Vol 43 (12) ◽  
pp. 2434-2442 ◽  
Author(s):  
Raymond C. Simon ◽  
John D. McIntyre ◽  
A. R. Hemmingsen
Keyword(s):  
Population Size ◽  
Family Size ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Effective Size ◽  
Effective Population ◽  
Data Set ◽  
Hatchery Stock ◽  
Study Population ◽  
Related Population

Means and variances of family size measured in five year-classes of wire-tagged coho salmon (Oncorhynchus kisutch) were linearly related. Population effective size was calculated by using estimated means and variances of family size in a 25-yr data set. Although numbers of age 3 adults returning to the hatchery appeared to be large enough to avoid inbreeding problems (the 25-yr mean exceeded 4500), the numbers actually contributing to the hatchery production may be too low. Several strategies are proposed to correct the problem perceived. Argument is given to support the contention that the problem of effective size is fairly general and is not confined to the present study population.

Carrying Capacity of an Enhanced Side-Channel for Rearing Salmonids

1983 ◽  
Vol 40 (8) ◽  
pp. 1320-1322 ◽  
Author(s):  
J. H. Mundie ◽  
R. E. Traber
Keyword(s):  
Rainbow Trout ◽  
Carrying Capacity ◽  
River Discharge ◽  
Coho Salmon ◽  
Unit Area ◽  
Oncorhynchus Kisutch ◽  
Water Velocity ◽  
Salmo Gairdneri ◽  
Side Channel ◽  
Biological Factors

Two attempts were made to establish the yield of steelhead smolts (sea-run rainbow trout) (Salmo gairdneri) from a seminatural side-channel and compare it to that of the parent river. In the first, 10 000 fry were introduced to the channel which was maintained at a discharge of 0.42 m3/s. The fry, however, were largely displaced by extraneous coho salmon (Oncorhynchus kisutch), appeared unable to withstand the water velocity in winter, and were greatly reduced by infection from Cryptobia. In the second trial discharge was 0.14 m3/s. The fry tolerated this. The yield (i.e. numbers) per unit area of steelhead smolts, of mean weight 14.5 g, was 31 times that of the river; in terms of biomass it was 10 times. Channel discharge was 2.6% of the river discharge. Physical and biological factors determining smolt yield from streams are considered.

scholarly journals Population Density or Populations Size. Which Factor Determines Urban Traffic Congestion?

2021 ◽  
Vol 13 (8) ◽  
pp. 4280
Author(s):  
Yu Sang Chang ◽  
Sung Jun Jo ◽  
Yoo-Taek Lee ◽  
Yoonji Lee
Keyword(s):  
Population Density ◽  
Population Size ◽  
Traffic Congestion ◽  
Critical Role ◽  
Small Population ◽  
High Density ◽  
Urban Traffic ◽  
Contradictory Result ◽  
Low Density

A large number of articles have documented that as population density of cities increases, car use declines and public transit use rises. These articles had a significant impact of promoting high-density compact urban development to mitigate traffic congestion. Another approach followed by other researchers used the urban scaling model to indicate that traffic congestion increases as population size of cities increases, thus generating a possible contradictory result. Therefore, this study examines the role of both density and population size on traffic congestion in 164 global cities by the use of Stochastic Impacts by Regression on Population, Affluence and Technology model. We divide 164 cities into the two subgroups of 66 low density cities and 98 high density cities for analysis. The findings from the subgroups analysis indicated a clear-cut difference on the critical role of density in low-density cities and the exclusive role of population size in high-density cities. Furthermore, using threshold regression model, 164 cities are divided into the two regions of large and small population cities to determine population scale advantage of traffic congestion. Our findings highlight the importance of including analysis of subgroups based on density and/or population size in future studies of traffic congestion.

Induced ovulation in coho salmon (Oncorhynchus kisutch). I. Further studies on the use of salmon pituitary preparations

Aquaculture ◽  
1981 ◽  
Vol 26 (1-2) ◽  
pp. 117-127 ◽  
Author(s):  
George A. Hunter ◽  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Induced Ovulation
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