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The heritability of resistance to gas bubble disease of Columbia River fall Chinook salmon, (Oncorhynchus tshawytscha)

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Title The heritability of resistance to gas bubble disease of Columbia River fall Chinook salmon, (Oncorhynchus tshawytscha)
Names Cramer, Steven P. (creator)
McIntyre, John D. (advisor)
Date Issued 1974-05-09 (iso8601)
Note Graduation date: 1974
Abstract A nested mating experiment in which 20 males were each mated
to four different females was used to obtain an estimate of the heritability
of resistance to death from gas bubble disease in Columbia
River fall chinook salmon (Oncorhynchus tshawytscha). Heritability
estimates ranged from 0. 037 to 0. 038.
Bioassays in 127 percent air supersaturated water were used
to compare the inherent resistance to gas bubble disease of selected
Columbia and Trask River stocks of juvenile fall chinook salmon.
In the first of two comparative bioassays, time to 50 percent mortality
in offspring from adults obtained at Little Goose Dam on the
Snake River was more than twice as great as that in offspring from
adults obtained from the Trask River. In the second experiment,
no significant difference in resistance to death from gas bubble
disease was found among several lower Columbia River stocks of fall
chinook; however, the average resistance of these stocks was significantly
greater than that of Trask River fall chinook.
A population model which incorporated response to selection
for increased resistance to gas bubble disease was used to predict
the numbers of fall chinook returning in the future to Kalama Hatchery.
It was found that smolt survival can be expected to show a maximum
increase of five to ten percent after 30 years of selection. These
results indicated that gas bubble disease will remain as a major
source of mortality of fall chinook smolts in the Columbia River until
lethal levels of air supersaturation are eliminated.
Genre Thesis/Dissertation
Topic Salmon -- Diseases
Identifier http://hdl.handle.net/1957/22162

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