Assessment of Southeast Alaska Pink Salmon Abundance Based on Commercial Catch and Effort and Sex Ratio Data

1998 ◽  
pp. 511-512
Author(s):  
Z Zheng ◽  
OA Mathisen
Keyword(s):  
Sex Ratio ◽  
Pink Salmon ◽  
Commercial Catch ◽  
Southeast Alaska ◽  
Ratio Data

Challenges for Diadromous Fishes in a Dynamic Global Environment

2009 ◽  
Keyword(s):  
Chinook Salmon ◽  
Large Scale ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Commercial Catch ◽  
Atmospheric Processes ◽  
Energy Transfers ◽  
Salmon Production ◽  
The Impact

<em>Abstract</em>.-Pacific salmon <em>Oncorhynchus </em>spp. catches are at historic high levels. It is significant that one of the world's major fisheries for a group of species that dominates the surface waters of the subarctic Pacific is actually very healthy. Natural trends in climate are now recognized to cause large fluctuations in Pacific salmon production, as shown in historical records of catch and recent changes probably have been affected by greenhouse gas induced climate changes. Pink salmon <em>O. gorbuscha </em>and chum salmon <em>O. keta </em>production and catch has increased in the past 30 years and may continue in a similar trend for for the next few decades. Coho salmon <em>O. kisutch </em>and Chinook salmon <em>O. tshawytscha </em>catches have been declining for several decades, particularly at the southern end of their range, and they may continue to decline. In the 1970s, hatcheries were considered to be a method of adding to the wild production of coho and Chinook salmon because the ocean capacity to produce these species was assumed to be underutilized. Large-scale changes in Pacific salmon abundances are linked to changes in large-scale atmospheric processes. These large-scale atmospheric processes are also linked to planetary energy transfers, and there is a decadal scale pattern to these relationships. Pacific salmon production in general is higher in decades of intense Aleutian lows than in periods of weak Aleutian lows. Key to understanding the impact of climate change on Pacific salmon is understanding how the Aleutian low will change. Chinook and coho salmon are minor species in the total commercial catch, but important socially and economically in North America. A wise use of hatcheries may be needed to maintain abundances of these species in future decades.

Toxicity of Various Formulations of 2,4-D to Salmonids in Southeast Alaska

1974 ◽  
Vol 31 (4) ◽  
pp. 480-485 ◽  
Author(s):  
William R. Meehan ◽  
Logan A. Norris ◽  
Howard S. Sears
Keyword(s):  
Sockeye Salmon ◽  
Coho Salmon ◽  
Pink Salmon ◽  
Butyl Ester ◽  
Southeast Alaska ◽  
Dolly Varden Char ◽  
Salmon Fry ◽  
Percent Mortality ◽  
The Mean ◽  
Made In

To determine acute toxicity to juvenile (1) pink, chum, coho, and sockeye salmon, (2) Dolly Varden char, and (3) rainbow trout, 2,4-D acid, butyl and isooctyl esters were tested in southeast Alaska. A comparable test was made in Oregon using coho salmon fingerlings. The mean percent mortality after 96 h and the highest concentration of herbicide that did not produce any mortality were determined for each formulation tested.At less than 50 ppm 2,4-D acid produced no mortality except in pink salmon fry. The butyl ester was most toxic causing nearly complete mortality in all species at concentrations > 1.0 ppm and the isooctyl ester least toxic of the ester formulations. Alaskan and Oregon coho fingerlings were similar in their responses to 2,4-D acid, butyl and isooctyl esters. The toxicities of three different formulations of isooctyl ester, a PGBE ester, and butyl ester to Alaskan coho fingerlings were also determined. There were few or no differences in toxicity among isooctyl ester formulations. The butyl and PGBE esters were similar in toxicity.

A factorial analysis of sex ratio data

1961 ◽  
Vol 25 (2) ◽  
pp. 117-121 ◽  
Author(s):  
A. W. F. Edwards
Keyword(s):  
Sex Ratio ◽  
Factorial Analysis ◽  
Ratio Data

scholarly journals Southeast Alaska Pink Salmon Growth and Harvest Forecast Models

2019 ◽  
pp. 75-81
Author(s):  
James Murphy ◽  
Emily Fergusson ◽  
Andrew Piston ◽  
Steven Heinl ◽  
Andrew Gray ◽  
...  
Keyword(s):  
Pink Salmon ◽  
Southeast Alaska ◽  
Forecast Models

scholarly journals Forecasting Pink Salmon Production in Southeast Alaska Using Ecosystem Indicators in Times of Climate Change

2016 ◽  
Vol 6 (1) ◽  
pp. 483-499 ◽  
Author(s):  
Joseph Orsi ◽  
Emily Fergusson ◽  
Alex Wertheimer ◽  
Edward Farley ◽  
Philip Mundy
Keyword(s):  
Climate Change ◽  
Pink Salmon ◽  
Southeast Alaska ◽  
Ecosystem Indicators ◽  
Salmon Production

scholarly journals No Evidence for Adaptive Differential Sex Allocation in Red Junglefowl (Gallus Gallus)

The Auk ◽  
2005 ◽  
Vol 122 (4) ◽  
pp. 1161-1168
Author(s):  
Timothy H. Parker
Keyword(s):  
Sex Ratio ◽  
Brood Size ◽  
Sex Allocation ◽  
Gallus Gallus ◽  
Ratio Analysis ◽  
Maternal Condition ◽  
Sperm Donor ◽  
Sex Ratio Bias ◽  
Red Junglefowl ◽  
Ratio Data

Abstract In many situations, selection should favor females that bias the sex ratio of their offspring. Two commonly examined factors potentially influencing off- spring sex ratio are paternal ornamentation and maternal condition. Male junglefowl with larger combs are attractive to females. I housed female Red Junglefowl (Gallus gallus) with sterile male consorts and artificially inseminated them with sperm from other males that the females never saw. I found no relationship between either the comb size of the consort or the comb size of the sperm donor and the sex ratio of the offspring. I previously reported a significant sex ratio bias related to maternal mass in Red Junglefowl. However, that analysis was based on sex ratio data not weighted for brood size and assuming a normal distribution. Here, I show that this effect disappears when I conduct a more appropriate analysis weighting sex ratio according to brood size and accounting for the binomial error distribution. I also failed to find evidence that male chicks hatch from larger eggs than female chicks. These results suggest that Red Junglefowl females may not bias the sex ratio of their brood in response to either their own condition or the attractiveness of the males with whom they copulate. Furthermore, these results demonstrate the importance of choosing the correct methods of sex ratio analysis. Falta de Evidencia de Asignación Adaptativa Diferencial entre Sexos en Gallus gallus

Possible Effects of the Sitka Eddy on Sockeye (Oncorhynchus nerka) and Pink Salmon (Oncorhynchus gorbuscha) Migration off Southeast Alaska

1986 ◽  
Vol 43 (2) ◽  
pp. 498-504 ◽  
Author(s):  
Kevin Hamilton ◽  
Lawrence A. Mysak
Keyword(s):  
Oncorhynchus Nerka ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Surface Currents ◽  
Oceanic Circulation ◽  
Migration Routes ◽  
Southeast Alaska ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Northeast Pacific ◽  
Northeast Pacific Ocean

The interannual variability of sockeye (Oncorhynchus nerka) and pink salmon (Oncorhynchus gorbuscha) catches during 1952–62 from southeast Alaska and northern British Columbia is examined in relation to the appearance and disappearance of the Sitka eddy in the offshore oceanic circulation. In years when this large (~300 km in diameter) and intense (surface currents ~0.5 m/s) vortex is present, the spawning migration routes of salmon returning to the Nass and Skeena rivers tend to be deflected southward. An analysis of salmon tagging data collected during 1957 (when the eddy was absent) and 1958 (when the eddy was present) supports this conclusion. The southward deflection during 1958 is a particularly interesting result in light of many other observations which show that several fish species were displaced northward during the 1958 warming of the northeast Pacific Ocean.

Relationships between Alaskan salmon catch and North Pacific climate on interannual and interdecadal time scales

1998 ◽  
Vol 55 (10) ◽  
pp. 2255-2265 ◽  
Author(s):  
Mary W Downton ◽  
Kathleen A Miller
Keyword(s):  
Time Scales ◽  
North Pacific ◽  
Large Scale ◽  
Climatic Factors ◽  
Multivariate Time Series ◽  
Pink Salmon ◽  
Egg Survival ◽  
Commercial Catch ◽  
Factors Affecting ◽  
The North

Using multivariate time series models, Alaska's statewide commercial catch of three salmon species during 1925-1994 is shown to be related to surface temperatures in particular large regions of the eastern North Pacific. Previous research has indicated that interdecadal changes in Alaskan catch levels are related to large-scale changes in the climate regime of the North Pacific. The present work focuses on interannual variability by controlling for climatic shifts in the mid-1940s and mid-1970s. For sockeye (Oncorhynchus nerka) and chum (O. keta), relationships with temperature occur within a few months after ocean entry with warmer regional temperatures enhancing survival. For sockeye and pink salmon (O. gorbuscha), relationships with temperature occur at the time and location of the return migration, suggesting that colder ocean temperatures may enhance spawning success or egg survival. In addition, the models show a significant positive relationship of chum catch to pink catch 2 years earlier, suggesting a common influence on smolts of the two species. The results support the contention that climatic factors affecting the marine environment play a significant role in salmon production on interannual, as well as interdecadal, time scales.

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