An Evaluation of Trout Culture
作者:
FredericF. Fish,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1940)
卷期:
Volume 69,
issue 1
页码: 85-89
ISSN:0002-8487
年代: 1940
DOI:10.1577/1548-8659(1939)69[85:AEOTC]2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In an evaluation of the efficiency of trout culture, the author presents a detailed analysis of complete loss records from 288 individual lots of trout at twenty-two hatcheries in the western United States. Summarized data are given to show the percentage loss of eggs, fry, and fingerlings by progressive one-half inch size groups. The accumulative percentage loss is also included to indicate the losses, under average hatchery conditions, between the egg stage and each successive size-group. These data cover the individual species of trout commonly reared in hatcheries; summarized data are given also for all species combined. A brief discussion of hatchery losses, natural losses, and the cost of artificial propagation is included.
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