Variability of family size and marine survival in pink salmon (Oncorhynchus gorbuscha) has implications for conservation biology and human use

1997 ◽  
Vol 54 (11) ◽  
pp. 2684-2690 ◽  
Author(s):  
Harold J Geiger ◽  
William W Smoker ◽  
Lev A Zhivotovsky ◽  
A J Gharrett
Keyword(s):  
Family Size ◽  
Conservation Biology ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Human Use ◽  
Marine Survival

Short-term Rearing of Pink Salmon (Oncorhynchus gorbuscha) Fry: Effect on Survival and Biomass of Returning Adults

1981 ◽  
Vol 38 (5) ◽  
pp. 554-558 ◽  
Author(s):  
Roy M. Martin ◽  
William R. Heard ◽  
Alex C. Wertheimer
Keyword(s):  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Short Term ◽  
Marine Diatoms ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Salmon Fry ◽  
Marine Survival

Survival of pink salmon (Onchorynchus gorbuscha) fry could theoretically be improved if they were reared to a larger size before being released into the estuary. Three lots of 1975-brood pink salmon fry, reared from eggs in a hatchery, were cultured in floating estuarine raceways for 30, 60, and 90 d before being released into the Little Port Walter estuary on Baranof Island, southeastern Alaska. An unfed control lot was released after emergence. Four groups of 15 000 fry each were differentially fin marked. Total marine survival for the four lots was computed from recoveries of marked adults in the Little Port Walter vicinity in 1977. Survival from release to return was lowest for the control lot (3.1%); increased for fry reared for 30 and 60 d (4.6 and 5.2%, respectively); and decreased for fry cultured for 90 d (4.3%). Mortalities in lots cultured for 60 and 90 d significantly reduced the numbers of fry released in these groups. Mortalities were associated with the marine diatoms Chaetoceros spp. Mean length and weight of returning adults declined with increased fry-rearing time. Compared with the control lot, adults from fry cultured for 30 d had 39% more biomass; adults from fry cultured for 60 d had the same biomass; and adults from fry cultured for 90 d had 45% less biomass. Culturing fry for 30 d in the raceways significantly increased the number and biomass of returning adults.Key words: short-term rearing, Oncorhynchus gorbuscha, floating estuarine raceways, marine survival, biomass

scholarly journals Ecological factors influencing lifetime productivity of pink salmon (Oncorhynchus gorbuscha) in an Alaskan stream

2017 ◽  
Vol 74 (9) ◽  
pp. 1325-1336 ◽  
Author(s):  
Christopher V. Manhard ◽  
John E. Joyce ◽  
William W. Smoker ◽  
Anthony J. Gharrett
Keyword(s):  
Time Series ◽  
Juvenile Fish ◽  
Pink Salmon ◽  
Survival Rates ◽  
Ecological Factors ◽  
Environmental Data ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Substrate Quality ◽  
Marine Survival

Ecological factors underlying freshwater productivity and marine survival of pink salmon (Oncorhynchus gorbuscha) were evaluated by analyzing a 30 year time series of local environmental data and censuses of migrating adult and juvenile fish collected at Auke Creek, Alaska. Freshwater productivity was influenced primarily by spawning habitat limitation and less so by stream temperature and flow. Furthermore, a trend of declining freshwater productivity was detected over the time series, which may be related to observed declines in spawning substrate quality and in the duration of the adult migration. Marine survival was highly variable among brood years and was influenced by physical conditions in the nearshore marine environment; warm sea-surface temperatures during nearshore residency were associated with higher marine survival rates, whereas high stream flows late in the fry emigration period were associated with reduced marine survival. Simulations of adult recruitment, based on ecological factors in the freshwater and marine environments, indicated that the productivity of pink salmon in this stream is determined primarily by early marine survival.

Pink salmon (Oncorhynchus gorbuscha) marine survival rates reflect early marine carbon source dependency

2008 ◽  
Vol 77 (2-3) ◽  
pp. 194-202 ◽  
Author(s):  
Thomas C. Kline ◽  
Jennifer L. Boldt ◽  
Edward V. Farley ◽  
Lewis J. Haldorson ◽  
John H. Helle
Keyword(s):  
Carbon Source ◽  
Pink Salmon ◽  
Survival Rates ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Marine Survival
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