Formation of Otolith Growth Increments and Their Potential for Assessing the Early Life History of Chinook Salmon (Oncorhynchus Tshawytscha) [microform] PDF Download
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![Formation of Otolith Growth Increments and Their Potential for Assessing the Early Life History of Chinook Salmon (Oncorhynchus Tshawytscha) [microform] PDF](https://books.google.com/books/content/images/frontcover/izzCwgEACAAJ?fife=w150-h200)
Author: John D. Neilson
Publisher: National Library of Canada
ISBN: 9780315180291
Category : Chinook salmon
Languages : en
Pages : 306
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Book Description
![Formation of Otolith Growth Increments and Their Potential for Assessing the Early Life History of Chinook Salmon (Oncorhynchus Tshawytscha) [microform] PDF](https://books.google.com/books/content/images/frontcover/izzCwgEACAAJ?fife=w80-h100)
Author: John D. Neilson
Publisher: National Library of Canada
ISBN: 9780315180291
Category : Chinook salmon
Languages : en
Pages : 306
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Author:
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 706
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Author: Brian Michael Walker
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 104
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Freshwater growth of juvenile Chinook salmon Oncorhynchus tshawytscha influences survival and recruitment to the adult population. Retrospective analysis is used to measure salmon growth at previous ages, with fish size and growth assumed to be accurately reflected by otolith increments and scale circuli. I conducted a 122-d laboratory experiment to validate the relationship among body size, growth, and width to daily otolith growth increments and scale circuli in juvenile stream-type Chinook salmon. Fish total length was found to be proportional to otolith axis length (r2 = 0.209, p
![The Use of Otolith Daily Increment Widths to Estimate the Size and Growth of Juvenile Chinook Salmon (Oncorhynchus Tshawytscha) [microform] PDF](https://books.google.com/books/content/images/frontcover/xsnIwgEACAAJ?fife=w80-h100)
Author: Bradford, Michael J
Publisher: National Library of Canada
ISBN: 9780315308107
Category : Chinook salmon
Languages : en
Pages : 168
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Author: David K. Stevenson
Publisher: McClain Printing Company
ISBN:
Category : Medical
Languages : en
Pages : 422
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The field of otolith microstructure research has experienced phenomenal growth since the early 1970s and now forms the basis for hundreds of studies in early life history, age, growth, recruitment, migration, mortality and stock structure. This book represents the first effort to compile and summarize the many techniques and procedures associated with studies of otolith microstructure. The complete sequence of events, from sample collection to data analysis, is covered comprehensively, so as to be applicable to most species and situations. The various chapters include both published and unpublished procedures.
Author: Angela Lind-Null
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 18
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"The Nisqually Fall Chinook population is one of 27 stocks in the Puget Sound evolutionarily significant unit listed as threatened under the Federal Endangered Species Act (ESA). Preservation and extensive restoration of the Nisqually delta ecosystem is currently taking place to assist in recovery of the stock as juvenile Fall Chinook salmon are dependent upon the estuary. A pre-restoration baseline that includes characterization of life history types, estuary residence times, growth rates, and habitat use is needed to evaluate the potential response of hatchery and natural origin Chinook salmon to restoration efforts and determine restoration success. Otolith analysis was selected to examine Chinook salmon life history, growth, and residence in the Nisqually Estuary. Previously funded work on wild samples collected in 2004 established the growth rate and length of residence associated with various habitats. The purpose of the current study is to build on the previous work by incorporating otolith microstructure analysis from 2005 (second sampling year), to verify findings from 2004, and to evaluate between-year variation in otolith microstructure. Our results from this second year of analysis indicated no inter-annual variation in the appearance of the tidal delta check (TDCK) and delta-flats check (DFCK). However, a new life history type (fry migrant) was observed on samples collected in 2005. Fish caught in the tidal delta regardless of capture date spent an average of 17 days in the tidal delta. There was a corresponding increase in growth rate as the fish migrated from freshwater (FW) to tidal delta to nearshore (NS) habitats. Fish grew 33 percent faster in the tidal delta than in FW habitat and slightly faster (14 percent) in the delta flats (DF) habitat compared to the tidal delta."--Abstract.
Author: Nathan Gail Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 154
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Author: Claire Anne Li Loong
Publisher:
ISBN:
Category : Otoliths
Languages : en
Pages : 196
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Book Description
The widths of growth zones recorded on otoliths of sockeye salmon (Oncorhynchus nerka) from Rivers Inlet were measured to assess the impacts of environmental conditions on growth at different life history stages. Otoliths from the pre-decline (1984-1987) and post-decline brood years (1997-2005) were compared. Post-decline juveniles were significantly larger than pre-decline individuals during the migration to sea, but grew less in the first marine year. Final size was not significantly different between time periods. Functional regression analyses were performed to investigate the relationship between otolith growth and sea surface salinity at McInnes Island. Otolith growth was positively correlated with salinity during September and October. Decreased salinity under a 30 ppt threshold appears to have signalled recent unfavourable oceanic conditions for growth and possibly survival.
Author: Charles Wilfred Hopley
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 106
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Author: Katherine Rose Middleton
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Evidence suggests that the variability in recruitment of adult Pacific salmon is related to smolt survival during the first ocean year. Specifically, the first few weeks and first marine winter may be two critical periods of high mortality during early marine life. Mortality during early marine residency has been attributed to predation and size-dependent factors while high mortality during the first winter may be due to energy deficits and failure to reach a certain size by the end of the growing season. My study assessed factors influencing overwinter mortality and early marine growth in juvenile Chinook salmon (Oncorhynchus tshawytscha) from Marble River, Quatsino Sound, British Columbia. Juvenile salmon were collected during November 2005 and 2006 (fall) and March 2006 and 2007(winter). Mortality rates over the first winter derived from catch per unit effort across seasons ranged between 80-90% in all years. These are the first estimations of overwinter mortality in juvenile Pacific salmon. Fish size distributions showed no evidence of size-selective overwinter mortality between fall and winter fish in either 2005-2006 or 2006-2007. Otolith microstructure analyses showed no significant difference in circulus increment widths during the first four weeks after marine entry. Similarities in increment width indicated that early marine growth did not differ between fall and winter fish during early marine residency in 2006. These observations show that the high overwinter mortality rates of juvenile Chinook salmon in Quatsino Sound are not size-dependent. Total plankton biomass was significantly lower in the winter season but size distribution, gut fullness and energy density data did not show evidence of starvation. No correlation was found between early marine growth, size, energy accumulation and high mortality in Marble River juvenile Chinook salmon during their first ocean winter in Quatsino Sound. Possible factors influencing these high mortality rates may include non size-selective predation, disease, local environmental influences or an as yet unknown source. Future work should continue to focus on understanding the relationship between early marine survival and adult recruitment. The expansion of growth comparisons geographically and chronologically while determining the effects of predatory mortality on juvenile Chinook salmon along the north Pacific continental shelf and beyond are imperative to fully understanding this complex marine life stage.
