Author: Ralph A. WellsPublisher:
ISBN:
Category : Pink salmon
Languages : en
Pages : 16
Book Description
Effect of Quality of the Spawning Bed on Growth and Development of Pink Salmon Embryos and Alevins
Author: Ralph A. WellsPublisher:
ISBN:
Category : Pink salmon
Languages : en
Pages : 16
Book Description
EFFECT OF QUALITY OF THE SPAWNING BED ON GROWTH AND DEVELOPMENT OF PINK SALMON EMBRYOS AND... ALEVINS (CLASSIC REPRINT).
Author: RALPH A. WELLSPublisher:
ISBN: 9781333758554
Category :
Languages : en
Pages : 0
Book Description
Effect of Quality of the Spawning Bed on Growth and Development of Pink Salmon Embryos and Alevins
Author: Ralph A. WellsEffect of Quality of the Spawning Bed on Growth and Developmentof Pink Salmon Embryos and Alevins
Author: R. A. WellsSuccess of Pink Salmon Spawning Relative to Size of Spawning Bed Materials
Author: William J. McNeilPublisher:
ISBN:
Category : Pink salmon
Languages : en
Pages : 24
Book Description
Success of Pink Salmon Spawning Relative to Size of Spawning Bed Materials (Classic Reprint)
Author: William J. McNeilPublisher:
ISBN: 9781332818761
Category : Technology & Engineering
Languages : en
Pages : 28
Book Description
Excerpt from Success of Pink Salmon Spawning Relative to Size of Spawning Bed Materials Permeability of bottom materials is prob ably an important factor limiting fry production in spawning beds. It has been shown how permeability is related to size composition of bottom materials, and it is possible to compare relative permeability of spawning beds by determining average size composi tion. Hence, a simple and direct method of measuring physical properties of spawning beds pertaining directly to their capacity to produce fry has been provided through develop ing techniques for measuring size composi tion of bottom materials. Pronounced differences in size composition of bottom materials were observed among several pink salmon spawning streams. The more productive spawning streams had the highest permeability coefficients. 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.
Survival and Development of Pink Salmon (Oncorhynchus Gorbuscha) Embryos and Fry as Related to Egg Size and Quantitative Genetic Variation
Author: Patrick William MalechaPublisher:
ISBN:
Category : Pink salmon
Languages : en
Pages : 136
Book Description
"The effect of egg weight on survival and development of pink salmon (Oncorhynchus gorbuscha) embryos, alevins, and fry was analyzed; in addition, embryo survival was investigated in relation to additive genetic variation. Embryonic survival to eyeing, development time to hatch, yolk weight, somatic tissue weight, yolk use rate, somatic tissue growth rate, and the survival of first-feeding fry was recorded relative to egg weight. The analyses demonstrated significant egg weight effects on development time to hatch, yolk weight, somatic tissue weight, yolk use rate, and somatic tissue growth rate on alevins. Weight and length of post-emergent fry (17 weeks post-ponding) were also significantly affected by initial egg weight. However, egg weight did not affect survival of eyed eggs or fry. Differential family-specific survival of eyed eggs indicated the presence of significant additive genetic variation"--Leaf 3.
Operation of Abernathy Channel for Incubation of Salmon Eggs
Author: Allan E. ThomasPublisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
Book Description
A spawning and incubation channel constructed in 1959 on Abernathy Creek near Longview, Washington, has been used for seasons to incubate fall chinook salmon and chum salmon eggs. Survival of eggs from both species was higher than reported for other channels and controlled-flow projects. Studies included effects of sedimentation, egg planting density, and stage of egg development at planting on survival. In early experiments sediment in the upper sections substantially reduced survival. In later experiments, after the construction of a sand trap and settling chamber, survivals significantly increased.
Effect of the Spawning Bed Environment on Reproduction of Pink and Chum Salmon
Author: William J. McNeilPublisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 29
Book Description
Three environmental factors--dissolved oxygen, the stability of spawning beds, and freezing--were studied in three southeastern Alaska streams.
Author: John Shaw