Author: K. H. MosherPublisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Identification of Pacific Salmon and Steelhead Trout ByScaleCharecteristics
Author: K. H. MosherIdentification of Pacific Salmon and Steelhead Trout by Scale Characteristics
Author: Kenneth H. MosherPublisher:
ISBN:
Category : Pacific salmon
Languages : en
Pages : 28
Book Description
Identification of Pacific Salmon and Steelhead Trout by Scale Characteristics (Classic Reprint)
Author: Kenneth H. MosherPublisher: Forgotten Books
ISBN: 9781334746970
Category : Science
Languages : en
Pages : 26
Book Description
Excerpt from Identification of Pacific Salmon and Steelhead Trout by Scale Characteristics In the following sections various subjects bearing on the use of scales for identification of species will be discussed. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Pacific Salmon & Steelhead Trout
Author: R. J. ChilderhosePublisher:
ISBN: 9780295958668
Category : Science
Languages : en
Pages : 158
Book Description
Racial Identification of Chinook Salmon (Oncorhynchus Tshawytscha) and Juvenile Steelhead Trout (Salmo Gairdneri)
Author: James T. MartinPublisher:
ISBN:
Category : Salmon
Languages : en
Pages : 64
Book Description
Efforts to manage stocks of salmonids in Pacific Northwest stream systems are complicated by the occurrence of several runs of a species thought to represent races rearing sympatrically as juveniles. In order to collect the population statistics needed to properly manage these stocks, managers need a method of identifying juvenile salmonids by race. In an effort to determine if taxonomic or morphological differences exist between these races, wild juvenile summer and winter steelhead trout (Salmo gairdneri) and wild juvenile spring and fall chinook salmon (Oncorhynchus tshawytscha) from the Rogue River (Oregon) were studied. The goal of the study was to determine if differences in taxonomic characters would allow racial identification of individual fish with 90% accuracy. The wild juvenile summer steelhead trout had significantly fewer vertebrae and larger nuclei, greater average intracircular spacing, and a larger length at first annulus formation of scales than winter steelhead trout. No differences between juvenile summer and winter steelhead trout were found in otolith nuclear diameter, total lipids or fatty acid composition of the muscle tissue. Wild juvenile spring chinook salmon exhibited significantly lower vertebral counts, larger otolith nuclear diameter, greater average intracircular spacing, larger scale nuclei, and a larger first and second band of five intracircular spaces than juvenile fall chinook salmon. Mesentary fat deposition was highly variable between fish from the same streams and was not useful in separating juveniles by race. Although significant differences between races were found for both species, none of these differences were sufficient to allow the racial identification of individual fish with 90% accuracy. It is not known if the differences found were caused by genetic or environmental effects or both. One experiment showed that summer and winter steelhead showed no difference in vertebrae or otolith dimensions when incubated under the same conditions, suggesting that differences found in wild steelhead trout were caused by environmental effects. The lack of distinct phenotypic differences between individual fish of different races may be caused by extensive interbreeding between races of salmonids in the Rogue Basin due to large environmental variability during the spawning season for chinook salmon and steelhead trout. It is also possible that environmental variation in the early life history masked genetic differences between the races.
Status of Columbia River Salmon and Steelhead Trout
Author: Frederick Charles CleaverPublisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 36
Book Description
Field Identification of Coastal Juvenile Salmonids
Author: W. R. PollardPublisher: Madeira Park, B.C. : Harbour Pub.
ISBN:
Category : Nature
Languages : en
Pages : 48
Book Description
A must for biologists, resource assessment workers, forestry workers, salmon enhancement groups, naturalists, fisheries students and members of the public interested in fisheries projects.
The Reaction of Five Species of Young Pacific Salmon and Steelhead Trout to Light
Author: Paul E. FieldsPublisher:
ISBN:
Category : Pacific salmon
Languages : en
Pages : 48
Book Description
Stock Identification of Columbia River Chinook Salmon and Steelhead Trout
Author: Carl B. SchreckPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 184
Book Description
Pacific Salmon Field Guide
Author: Sean GodwinPublisher:
ISBN: 9781774511343
Category :
Languages : en
Pages : 0
Book Description
Pacific salmon have immense cultural, ecological and economic importance to the west coast of North America. Two salmon researchers have worked extensively in the field with this iconic group of fish and have developed the first comprehensive field identification guide for the seven Pacific salmon species--sockeye, coho, Chinook, pink, chum, steelhead and coastal cutthroat--across five life stages, with detailed illustrations by Joseph Tomelleri and photographs by Tavish Campbell.