Comparisons of Two Bluegill Populations by Means of the RNA-DNA Ratio and Liver-Somatic Index
作者:
FrankJ. Bulow,
C.B. Coburn,
CharlesS. Cobb,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1978)
卷期:
Volume 107,
issue 6
页码: 799-803
ISSN:0002-8487
年代: 1978
DOI:10.1577/1548-8659(1978)107<799:COTBPB>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Bluegills (Lepomis macrochirus Rafinesque) from two central Tennessee lakes revealed monthly and seasonal variations of liver RNA-DNA ratios (liver RNA/DNA) and liver-somatic indexes (LSI's) that were associated with gonad maturation, spawning, and temperature. Liver RNA/DNA indicated a longer summer growth depression in fish collected from the smaller, shallower lake. Although LSI's were consistently higher in the smaller, shallower lake, liver RNA/DNA and scale analyses showed faster growth rate in the larger, deeper lake. Thus the LSI may be a useful indicator of relative food intake-energy storage levels within a single lake, but it does not necessarily reflect absolute growth rate of the fish. Liver RNA/DNA provided an indication of immediate or short-term growth rates.
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