scholarly journals Skewed genetic sex ratio in reciprocal hybrids between pink salmon and masu salmon

2021 ◽  
Vol 87 (5) ◽  
pp. 473-482
Author(s):  
FUMIKA SHIMA ◽  
REI ASANUMA ◽  
TAKAHISA KANEYASU ◽  
MASAKI ICHIMURA ◽  
EISUKE TAKAHASHI ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Pink Salmon ◽  
Masu Salmon ◽  
Reciprocal Hybrids

Sex ratio control in pink salmon (Oncorhynchus gorbuscha and chum salmon (O. keta) populations: The possible causes and mechanisms of changes in the sex ratio

2008 ◽  
Vol 44 (7) ◽  
pp. 786-792 ◽  
Author(s):  
Vl. A. Brykov ◽  
A. D. Kukhlevsky ◽  
E. A. Shevlyakov ◽  
N. M. Kinas ◽  
L. O. Zavarina
Keyword(s):  
Sex Ratio ◽  
Chum Salmon ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha

scholarly journals A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan

2006 ◽  
Vol 63 (7) ◽  
pp. 1353-1363 ◽  
Author(s):  
Kentaro Morita ◽  
Toshihiko Saito ◽  
Yasuyuki Miyakoshi ◽  
Masa-aki Fukuwaka ◽  
Toru Nagasawa ◽  
...  
Keyword(s):  
Adaptive Learning ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Active Regions ◽  
Masu Salmon ◽  
Learning Approaches ◽  
Management Tools ◽  
Salmon Hatchery ◽  
Species Specific ◽  
Hokkaido Island

Abstract Hatchery programmes involving the mass release of cultured fish have been implemented worldwide to supplement wild populations and to increase harvests. Hokkaido Island is one of the most active regions for Pacific salmon hatchery programmes, with ca. 1.2 billion (109) juveniles released annually along a coastline of ca. 3000 km. During the last quarter of the 20th century, coastal catches of chum and pink salmon increased dramatically, whereas those of masu salmon did not. In addition to the development of hatchery technologies, several possible hypotheses may explain these catch trends, including climate change, closing of high-seas fisheries, rehabilitation of water quality, habitat loss caused by damming and channelling, and increased pressure from recreational fisheries. Even when these other factors have been accounted for, it is difficult to evaluate whether all hatchery programmes have actually increased net populations. To use these programmes more effectively, it is necessary to evaluate both their river- and species-specific benefits and compare hatchery programmes with other management tools, such as fishery controls and habitat rehabilitation. Future hatchery programmes should incorporate active, adaptive learning approaches to minimize the risks associated with artificial propagation and to promote sustainable salmon stocks.

scholarly journals Compositions of fatty acids in the lipids of masu salmon and pink salmon, and latter canned flesh.

1989 ◽  
Vol 55 (9) ◽  
pp. 1655-1660 ◽  
Author(s):  
Shigefumi Sasaki ◽  
Toru Ota ◽  
Toru Takagi
Keyword(s):  
Fatty Acids ◽  
Pink Salmon ◽  
Masu Salmon

Survival and Production of Pink and Chum Salmon in a Coastal Stream

1959 ◽  
Vol 16 (6) ◽  
pp. 835-886 ◽  
Author(s):  
J. G. Hunter
Keyword(s):  
British Columbia ◽  
Population Density ◽  
Sex Ratio ◽  
Chum Salmon ◽  
Pink Salmon ◽  
Survival Rates ◽  
Coastal Region ◽  
Fishing Mortality ◽  
Stream Discharge ◽  
Effects Of Temperature

A study of the propagation of pink and chum salmon in the central coastal region of British Columbia was made for the years 1947 to 1956.Timing, distribution and movement of the adults and fry are discussed. The effects of temperature, stream discharge, sex ratio and population density were considered in relation to survival of egg to fry. Within the limits observed, temperature, stream discharge and sex ratio were not affecting the population perceptibly, but population density was an important factor. The density of spawners in preceding years also affected the survival in subsequent years.Predation was an important factor in keeping the fry output low: the number of fry consumed was approximately 500,000 during each migration.Ocean survival, including the effect of fishing mortality, ranged from 5.2% down to 0.7% for pink salmon, and from 2.6% to 0.85% for chum salmon. Ocean survival for pink salmon before fishing mortality occurred ranged from 10.8% down to 1.0%.Combination of freshwater and ocean survival rates indicate that a variation up to 190 times the lowest rate recorded is possible.

Die unbehandelten Kranken: Ältere Männer mit Depression

2008 ◽  
Vol 27 (07) ◽  
pp. 617-619 ◽  
Author(s):  
M. Wittmann ◽  
E. Haen ◽  
H. Spießl ◽  
H. Hausner
Keyword(s):  
Sex Ratio ◽  
Epidemiologische Studien

ZusammenfassungZahlreiche epidemiologische Studien zeigen, dass sich das Geschlechterverhältnis der Prävalenz depressiver Erkrankungen ab der 6. Lebensdekade – also nach der weiblichen Menopause – wieder annähert. Wir haben untersucht, ob sich dieser epidemiologische Effekt auch in der stationären Versorgung abbildet. Unter Verwendung der AGATE-Stichtagsdaten der Jahre 2000 bis 2004, wurde der Zusammenhang zwischen Geschlecht und Alter bei stationär behandelten depressiven Patienten analysiert. Der Zusammenhang zwischen Geschlechterverhältnis und dem Alter wurde mithilfe des Korrelationskoeffizienten nach Spearman sowie mit χ2-Test untersucht. In der 5. und 6. Lebensdekade lag die Sex-Ratio F/M bei 1,7:1, sie stieg in der 7. Dekade auf 2,2:1 und in der 8. Dekade auf 2,6:1 an. Anders als aufgrund epidemiologischer Studien zu erwarten wäre, nähert sich in der stationär psychiatrischen Versorgung das Verhältnis depressiver Patienten im Alter nicht an. Depressive ältere Männer sind also im stationären Versorgungssystem unterrepräsentiert.

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