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Standardized seawater rearing of chinook salmon smolts to evaluate hatchery practices showed low statistical power

Transactions of the American Fisheries Society

By:
and
DOI: 10.1577/1548-8659(2001)130<0409:SSROCS>2.0.CO;2

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Abstract

We examined, under standardized conditions, seawater survival of chinook salmon Oncorhynchus tshawytscha at the smolt stage to evaluate the experimental hatchery practices applied to their rearing. The experimental rearing practices included rearing fish at different densities; attempting to control bacterial kidney disease with broodstock segregation, erythromycin injection, and an experimental diet; rearing fish on different water sources; and freeze branding the fish. After application of experimental rearing practices in hatcheries, smolts were transported to a rearing facility for about 2-3 months of seawater rearing. Of 16 experiments, 4 yielded statistically significant differences in seawater survival. In general we found that high variability among replicates, plus the low numbers of replicates available, resulted in low statistical power. We recommend including four or five replicates and using ?? = 0.10 in 1-tailed tests of hatchery experiments to try to increase the statistical power to 0.80.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Standardized seawater rearing of chinook salmon smolts to evaluate hatchery practices showed low statistical power
Series title:
Transactions of the American Fisheries Society
DOI:
10.1577/1548-8659(2001)130<0409:SSROCS>2.0.CO;2
Volume
130
Issue:
3
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Transactions of the American Fisheries Society
First page:
409
Last page:
416
Number of Pages:
8