Number of Circuli and Time of Annulus Formation on Scales of Pink Salmon (Oncorhynchus gorbuscha)

1966 ◽  
Vol 23 (5) ◽  
pp. 747-756 ◽  
Author(s):  
Roger E. Pearson
Keyword(s):  
North America ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
Fork Length ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Annulus Formation ◽  
Relationship Of ◽  
The Relationship

Mean numbers of circuli on scales of juvenile pink salmon collected along the coast of North America in 1964 increased from 1.7 on June 23 to 17.4 on September 10. On scales of adults collected from the eastern North Pacific Ocean from 1962 to 1965, mean numbers of circuli ranged from 24.1 on January 23 (1964) to 46.9 on September 2 (1962). The fork length at time of scale formation was approximately 60 mm. Mean fork length increased with the total number of circuli. The relationship of fork length to number of scale circuli showed some variation between stocks. The winter ring was present or was being formed on the majority of scales taken in late January. The development of the annulus varied considerably among individual fish.

LAMPRITREMA NIPPONICUM YAMAGUTI (TREMATODA) FROM NEW HOSTS IN THE NORTH PACIFIC OCEAN, THE RELATIONSHIP OF DISTOMUM MIESCHERI ZSCHOKKE, AND THE STATUS OF THE FAMILY LAMPRITREMATIDAE

1962 ◽  
Vol 40 (5) ◽  
pp. 941-950
Author(s):  
L. Margolis
Keyword(s):  
North Pacific ◽  
North Pacific Ocean ◽  
Oncorhynchus Gorbuscha ◽  
The North ◽  
The Family ◽  
The Status ◽  
New Hosts ◽  
Relationship Of ◽  
The Relationship ◽  
The North Pacific

Lampritrema nipponicum is recorded from three new hosts in the North Pacific: Brama rayi (Bloch), Oncorhynchus nerka (Walbaum), and Oncorhynchus gorbuscha (Walbaum). Only immature specimens were found in the last two (evidently accidental) hosts. Distomum miescheri Zschokke is transferred to Lampritrema, becoming Lampritrema miescheri (Zschokke) nov. comb. This species possibly is identical with L. nipponicum. Lampritrematidae is considered a valid family, distinct from Hemiuridae sensu lato.

Efficiency of Natural Propagation of the Pink Salmon (Oncorhynchus gorbuscha) in McClinton Creek, Masset Inlet, B.C.

1948 ◽  
Vol 7b (5) ◽  
pp. 224-236 ◽  
Author(s):  
A. L. Pritchard
Keyword(s):  
Pink Salmon ◽  
Climatic Conditions ◽  
Spawning Migration ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Egg Deposition ◽  
Number Of Factors ◽  
Biological Environment ◽  
Relationship Of ◽  
The Relationship

Through the medium of specially-designed counting fences, records have been maintained of the adult pink salmon, Oncorhynchus gorbuscha, spawning in McClinton creek, Masset inlet, B.C. from 1930 to 1942, of the eggs available for deposition each season and of the fry resulting from these eggs. A loss of 76.2 to 93.1 per cent of the potential egg deposition occurs between the time of upstream spawning migration and the egress of the fry to sea. This mortality is assigned to a number of factors, some of which are briefly discussed. Within certain limits and under reasonably uniform climatic conditions smaller egg depositions provide greater efficiencies of hatch (percentage relationship of numbers of fry migrants to potential egg deposition). There thus appears a tendency toward rebuilding the run, herein termed "resilience," and believed to be closely bound up with the relationship between the fish and its physical and biological environment.

Relationship between Growth and Total Nucleic Acids in Juvenile Pink Salmon, Oncorhynchus gorbuscha, Fed Crude Oil Contaminated Food

1993 ◽  
Vol 50 (5) ◽  
pp. 996-1001 ◽  
Author(s):  
Shiao Y. Wang ◽  
Judith L. Lum ◽  
Mark G. Carls ◽  
Stanley D. Rice
Keyword(s):  
Nucleic Acid ◽  
Nucleic Acids ◽  
Crude Oil ◽  
Pink Salmon ◽  
Fork Length ◽  
Fish Growth ◽  
Oncorhynchus Gorbuscha ◽  
Cell Integrity ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Contaminated Food

Total nucleic acids of juvenile pink salmon, Oncorhynchus gorbuscha, fed crude oil contaminated food were analyzed to determine if nucleic acid measurements can be used to evaluate growth of fish collected at oil spill sites. In general, the nucleic acid concentration (micrograms per milligram dry weight) of salmon fry fed food contaminated with either 0.37 or 2.78 mg crude oil/g food was not significantly affected. However, RNA concentration of fry fed food contaminated with 34.83 mg/g was reduced whereas DNA concentration increased. Results over 8 wk indicate decreased protein synthesis and cell content but maintenance of cell integrity in these fish. Growth was inversely related to the level of crude oil contamination in the food. The significant correlations between measured growth and RNA/DNA ratios and RNA contents (micrograms RNA per millimetre fork length) suggest that nucleic acid measurements can be used to compare growth of fish collected from the field.

scholarly journals Transhemispheric ecosystem disservices of pink salmon in a Pacific Ocean macrosystem

2018 ◽  
Vol 115 (22) ◽  
pp. E5038-E5045 ◽  
Author(s):  
Alan M. Springer ◽  
Gus B. van Vliet ◽  
Natalie Bool ◽  
Mike Crowley ◽  
Peter Fullagar ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Geographic Scale ◽  
The North ◽  
Basin Scale ◽  
Ecosystem Disservices ◽  
The North Pacific

Pink salmon (Oncorhynchus gorbuscha) in the North Pacific Ocean have flourished since the 1970s, with growth in wild populations augmented by rising hatchery production. As their abundance has grown, so too has evidence that they are having important effects on other species and on ocean ecosystems. In alternating years of high abundance, they can initiate pelagic trophic cascades in the northern North Pacific Ocean and Bering Sea and depress the availability of common prey resources of other species of salmon, resident seabirds, and other pelagic species. We now propose that the geographic scale of ecosystem disservices of pink salmon is far greater due to a 15,000-kilometer transhemispheric teleconnection in a Pacific Ocean macrosystem maintained by short-tailed shearwaters (Ardenna tenuirostris), seabirds that migrate annually between their nesting grounds in the South Pacific Ocean and wintering grounds in the North Pacific Ocean. Over this century, the frequency and magnitude of mass mortalities of shearwaters as they arrive in Australia, and their abundance and productivity, have been related to the abundance of pink salmon. This has influenced human social, economic, and cultural traditions there, and has the potential to alter the role shearwaters play in insular terrestrial ecology. We can view the unique biennial pulses of pink salmon as a large, replicated, natural experiment that offers basin-scale opportunities to better learn how these ecosystems function. By exploring trophic interaction chains driven by pink salmon, we may achieve a deeper conservation conscientiousness for these northern open oceans.

Productivity and life history of sockeye salmon in relation to competition with pink and sockeye salmon in the North Pacific Ocean

2015 ◽  
Vol 72 (6) ◽  
pp. 818-833 ◽  
Author(s):  
Gregory T. Ruggerone ◽  
Brendan M. Connors
Keyword(s):  
North Pacific ◽  
Sockeye Salmon ◽  
North Pacific Ocean ◽  
Pink Salmon ◽  
Geographic Area ◽  
Oncorhynchus Gorbuscha ◽  
Fraser River ◽  
The Past ◽  
The North ◽  
Key Factor

Sockeye salmon (Oncorhynchus nerka) populations from Southeast Alaska through British Columbia to Washington State have experienced similar declines in productivity over the past two decades, leading to economic and ecosystem concerns. Because the declines have spanned a wide geographic area, the primary mechanisms driving them likely operate at a large, multiregional scale at sea. However, identification of such mechanisms has remained elusive. Using hierarchical models of stock–recruitment dynamics, we tested the hypothesis that competition between pink (Oncorhynchus gorbuscha) and sockeye salmon for prey has led to reduced growth and productivity and delayed maturation of up to 36 sockeye populations spanning the region during the past 55 years. Our findings indicate the abundance of North Pacific pink salmon in the second year of sockeye life at sea is a key factor contributing to the decline of sockeye salmon productivity, including sockeye in the Fraser River where an increase from 200 to 400 million pink salmon is predicted to reduce sockeye recruitment by 39%. Additionally, length-at-age of Fraser River sockeye salmon declined with greater sockeye and pink salmon abundance, and age at maturity increased with greater pink salmon abundance. Our analyses provide evidence that interspecific competition for prey can affect growth, age, and survival of sockeye salmon at sea.

Variability in Aerial Counts of Spawning Salmon

1961 ◽  
Vol 18 (3) ◽  
pp. 337-348 ◽  
Author(s):  
Donald E. Bevan
Keyword(s):  
Experimental Design ◽  
Population Size ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Spawning Ground ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Kodiak Island ◽  
Aerial Surveys ◽  
The Relationship ◽  
Made In

A study of spawning ground surveys for pink salmon (Oncorhynchus gorbuscha) was made in two streams on Kodiak Island. An experimental design is described which permits replication of observers' counts of spawning salmon. The variance in an observer's estimate was found to be proportionate to the size of the estimate. The experiments indicated that an observer will detect differences in population size of plus or minus 50%. The relationship between counts of one observer and another changes within different streams, but within each river the observations of one observer were correlated with those of another. The results of the experiments are summarized in recommendations for aerial surveys of spawning salmon.

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