Assessment of Lacustrine Productivity Relative to Juvenile Sockeye Salmon (Oncorhynchus Nerka) Production in Chignik and Black Lakes PDF Download
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Author: Gary B. Kyle
Publisher:
ISBN:
Category : Lakes
Languages : en
Pages : 40
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Book Description
Reports on the results of limnological investigations of general water-quality parameters, nutrients, phytoplankton, zooplankton, and fall fry, which were conducted in Chignik and Black Lakes during 1991 to characterize lake productivity relative to juvenile sockeye salmon (Oncorhynchus nerka) production, historical information, and other sockeye nursery lakes.
Author: Gary B. Kyle
Publisher:
ISBN:
Category : Lakes
Languages : en
Pages : 40
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Book Description
Reports on the results of limnological investigations of general water-quality parameters, nutrients, phytoplankton, zooplankton, and fall fry, which were conducted in Chignik and Black Lakes during 1991 to characterize lake productivity relative to juvenile sockeye salmon (Oncorhynchus nerka) production, historical information, and other sockeye nursery lakes.
Author: Alaska. Division of Fisheries Rehabilitation, Enhancement, and Development
Publisher:
ISBN:
Category : Fish habitat improvement
Languages : en
Pages : 630
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Book Description
Author: Alaska. Division of Fisheries Rehabilitation, Enhancement, and Development
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
Author: David Barto
Publisher:
ISBN:
Category : Freshwater productivity
Languages : en
Pages : 222
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Book Description
"Anadromous sockeye salmon are the only Pacific salmon that require an extensive rearing period in a lake environment. Recent studies suggest changes in lake nutrient inputs are directly related to the magnitude of annual spawning populations (escapement), and can be quantified by sediment stable isotope analysis of nitrogen 15N). Marine nitrogen supplied by returned salmon is enriched in 15N relative to the freshwater nitrogen, which is derived from atmospheric N2 (ð15N=0 0/00). Recent (1987-1996) limnological investigations of Chilkat Lake, Alaska, matched to brood year escapement estimates, indicate that sockeye marine-derived phosphorus and nitrogen contributed up to 87% and 20%, respectively, of the lake nutrient pool. Since salmon populations fluctuate annually, the resulting marine derived nutrient (MDN) inputs and ð15N also fluctuate. Sedimentary ð15N is positively correlated (r2=0.8605, p=0.0076, df=5) with observed escapement. Additionally, ð15N is positively related to lake paleoproductivity and inversely correlated with high concentrations of CaCO3 and glacial silt. The frequency and duration of these CaCO3 inputs are believed to be the result of climate related glacial meltwater intrusions from the Tsirku River. Thus, fluctuations in MDN can be shown to influence the overall sockeye salmon production at Chilkat Lake by controlling lake productivity"--Leaf iii.
Author: Jeremy M. B. Hume
Publisher: Cultus Lake, B.C. : Fisheries and Oceans Canada, Science
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Juvenile sockeye salmon rearing in Babine Lake were re-examined 22 years after the initiation of the Babine Lake Development Project (BLDP). Abundance, distribution, size, and species composition of the limnetic fish populations, including juvenile sockeye salmon, were determined by hydroacoustic and midwater trawl surveys in the autumn of 1993 and the summer and fall of 1994 and 1995 and compared to results collected before and shortly after the start of the BDLP. Our objectives were to look for: 1) changes in the abundance of juvenile sockeye relative to spawning numbers; 2) changes in the utilization of the available nursery area; and 3) the effects of increased popualtion size and density on the size and growth of juvenile sockeye.
Author: University of Washington. College of Fisheries
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 520
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Book Description
Author: Lorna I. Wilson
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 162
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Book Description
"The growth of Seward Peninsula sockeye salmon (Oncorhynchus nerka) from Salmon and Glacial lakes is related to their physical environment. Dermal scales collected over many years were measured to document the annual age specific growth of smolts and adults. The effect of fertilization on fry growth was examined using the first year of growth. The growth histories of Salmon Lake sockeye salmon were compared to Glacial Lake sockeye salmon through smolting and in the marine environment. Annual age specific fry growth had no direct relationship to fertilization; however, there were interactions between biomass of salmon prey and fertilization, and between prey biomass and age of smolting. Glacial Lake age-1 smolts are the same size as Salmon Lake age-1 smolts, but age-1.3 Salmon Lake juveniles after their first year in the ocean are smaller than age-1.3 Glacial Lake juveniles suggesting lower size based mortality. The differences in growth histories show each population's response to lake production and mortality experienced by smolt between the rearing lake and the ocean"--Leaf iii.
Author: John Paul Blum
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 214
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Book Description
Author: Lorne E. White
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 43
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Book Description
Author: Ryan K. Simmons
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 130
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Book Description
