Variable Effects of Biological and Environmental Processes on Coho Salmon Marine Survival in Southeast Alaska PDF Download
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Author: Michael J. Malick
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 104
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Book Description
"I examined the relationships between coho salmon Oncorhynchus kisutch marine survival and seven biological and physical covariates across 14 Southeast Alaska (SEAK) stocks. A primary focus of the study was to investigate the influence of pink O. gorbuscha and chum O. keta salmon fry abundances on marine survival. The coho salmon stocks exhibited strong covariation, suggesting common regional processes are influencing marine survival in SEAK. However, only two of the covariates, the North Pacific index and SEAK pink salmon harvest, had consistent relationships across all 14 stocks with both of the covariates relating positively with marine survival. The other covariates all had inconsistent relationships with marine survival. An index representing hatchery pink and chum salmon fry abundance had a stronger estimated effect on marine survival than an index of wild pink salmon fry abundance and SEAK pink salmon harvest numbers. The magnitude and sign of the hatchery pink and chum salmon effect varied greatly among different localities. This study provides evidence that coho salmon stocks throughout SEAK experience some degree of regional concordance in the marine environment, but also that local stock specific conditions are important in fully understanding variation in marine survival"--Leaf iii.
Author: Michael J. Malick
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 104
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Book Description
"I examined the relationships between coho salmon Oncorhynchus kisutch marine survival and seven biological and physical covariates across 14 Southeast Alaska (SEAK) stocks. A primary focus of the study was to investigate the influence of pink O. gorbuscha and chum O. keta salmon fry abundances on marine survival. The coho salmon stocks exhibited strong covariation, suggesting common regional processes are influencing marine survival in SEAK. However, only two of the covariates, the North Pacific index and SEAK pink salmon harvest, had consistent relationships across all 14 stocks with both of the covariates relating positively with marine survival. The other covariates all had inconsistent relationships with marine survival. An index representing hatchery pink and chum salmon fry abundance had a stronger estimated effect on marine survival than an index of wild pink salmon fry abundance and SEAK pink salmon harvest numbers. The magnitude and sign of the hatchery pink and chum salmon effect varied greatly among different localities. This study provides evidence that coho salmon stocks throughout SEAK experience some degree of regional concordance in the marine environment, but also that local stock specific conditions are important in fully understanding variation in marine survival"--Leaf iii.
Author: Joshua Benjamin Robins
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 198
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Book Description
"Correlation and stepwise regression analyses were used to investigate relationships between growth in four distinct marine habitats, marine survival, and biophysical indices for Auke Creek coho salmon, a coho salmon population in Southeast Alaska. Early marine growth of males and females were positively correlated, but neither was correlated with early marine growth of jacks. Regional biophysical indices had significant effects on early marine growth of jack, but not on early marine growth of adult coho salmon. Sea surface temperature and number of hatchery pink and churn salmon juveniles released had negative and positive effects on growth in strait habitat, respectively. Hatchery pink and churn salmon abundance and pink salmon catch in Northern Southeast Alaska were negatively related to the growth of Auke Creek coho salmon in the late ocean phase. The average length-at-return of males, but not females, was negatively related to the abundance of hatchery pink and chum salmon. Female and male size-at-return were positively correlated (r = 0.68) but within-year variation was less for females, indicating possible sex-specific differences in adult size requirements associated with reproductive success. Adult survival and jack return rate were significantly related to early marine growth of adults and jacks, respectively, indicating size-selective mortality. Hatchery pink and churn salmon abundance had positive effects on adult survival and jack return rate"--Leaf iii.
Author: Jessica L. Beetz
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 109
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Author: Ryan Jordan Briscoe
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 114
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Book Description
"Correlation analyses and stepwise regression models were run to examine relationships between Auke Creek coho salmon marine survival, scale growth, and a number of physical and biological covariates: local sea surface and air temperatures, local precipitation, the Pacific Decadal Oscillation, local hatchery release numbers, size at return, and regional and state salmon catch numbers. Jack survival and adult survival covaried strongly, suggesting the primary cause of mortality is encountered in the first four or five months of marine life. The number of hatchery fish had the strongest correlation with marine survival (r = 0.71), which could indicate that hatchery releases are prey for Auke Creek coho smolts or buffering these smolts from predators. Sea surface temperature was not significantly associated with adult survival, but was with jack survival. Surprisingly, scale growth was not correlated with marine survival. Adult size appears to be determined in the last year of marine life when the fish are in the Gulf of Alaska. Regional survival trends followed closely with Auke Creek marine survival, indicating factors affecting survival are regional in scope. Specific mechanisms were not defined, but the results indicate biological covariates were more associated with Auke Creek coho survival than were physical covariates"--Leaf iii.
Author: Leon D. Shaul
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 88
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Book Description
Reports on the status of coho salmon stocks in Southeast Alaska, which was assessed from information on escapement, smolt abundance, marine survival, and total abundance from coded-wire-tagged indicator stocks and from stocks returning to streams that were surveyed for escapement.
Author:
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 968
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Book Description
Author: Thomas P. Quinn
Publisher: UBC Press
ISBN: 0774842431
Category : Nature
Languages : en
Pages : 392
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Book Description
The Behavior and Ecology of Pacific Salmon and Trout explains the patterns of mate choice, the competition for nest sites, and the fate of the salmon after their death. It describes the lives of offspring during the months they spend incubating in gravel, growing in fresh water, and migrating out to sea to mature. This thorough, up-to-date survey should be on the shelf of everyone with a professional or personal interest in Pacific salmon and trout. Written in a technically accurate but engaging style, it will appeal to a wide range of readers, including students, anglers, biologists, conservationists, legislators, and armchair naturalists.
Author: Kenneth M. Leber
Publisher: John Wiley & Sons
ISBN: 0470751312
Category : Technology & Engineering
Languages : en
Pages : 584
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Book Description
The collapse of many of the World’s fisheries continues to be of major concern and the enhancement of fish stocks through techniques such as ranching is of huge importance and interest across the globe. This important book, which contains fully peer reviewed and carefully edited papers from the 2nd International Symposium in Stock Enhancement and Sea Ranching is broadly divided into sections covering the following areas: The present situation of stock enhancement Seed quality and techniques for effective stocking Health management of hatchery stocks Methods for evaluating stocking effectiveness Population management in stock enhancement and sea ranching Management of stocked populations Ecological interactions with wild stocks Genetic management of hatchery and wild stocks Socio-economics of stock enhancement Case studies Stock Enhancement and Sea Ranching has been written and edited by some of the world’s foremost authorities in fisheries science and related areas and is essential reading for all fisheries scientists throughout the World. Fish biologists, marine and aquatic scientists, environmental biologists, ecologists, conservationists, aquaculture personnel and oceanographers will all find much of use and interest within this book. All libraries within universities and research establishments where these subjects are studied and taught should have copies of this book on their shelves.
Author: Cornelis Groot
Publisher: UBC Press
ISBN: 9780774803595
Category : Nature
Languages : en
Pages : 602
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Book Description
Pacific salmon are an important biological and economic resource of countries of the North Pacific rim. They are also a unique group of fish possessing unusually complex life histories. There are seven species of Pacific salmon, five occurring on both the North American and Asian continents (sockeye, pink, chum, chinook, and coho) and two (masu and amago) only in Asia. The life cycle of the Pacific salmon begins in the autumn when the adult female deposits eggs that are fertilized in gravel beds in rivers or lakes. The young emerge from the gravel the following spring and will either migrate immediately to salt water or spend one or more years in a river or lake before migrating. Migrations in the ocean are extensive during the feeding and growing phase, covering thousands of kilometres. After one or more years the maturing adults find their way back to their home river, returning to their ancestral breeding grounds to spawn. They die after spawning and the eggs in the gravel signify a new cycle. Upon this theme Pacific salmon have developed many variations, both between as well as within species. Pacific Salmon Life Histories provides detailed descriptions of the different life phases through which each of the seven species passes. Each chapter is written by a scientist who has spent years studying and observing a particular species of salmon. Some of the topics covered are geographic distribution, transplants, freshwater life, ocean life, development, growth, feeding, diet, migration, and spawning behaviour. The text is richly supplemented by numerous maps, illustrations, colour plates, and tables and there is a detailed general index, as well as a useful geographical index.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 690
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