Growth and Survival of Colorado Squawfish in the Upper Colorado River
作者:
D.B. Osmundson,
R.J. Ryel,
T.E. Mourning,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1997)
卷期:
Volume 126,
issue 4
页码: 687-698
ISSN:0002-8487
年代: 1997
DOI:10.1577/1548-8659(1997)126<0687:GASOCS>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Growth and adult survival rates were estimated for the endangered Colorado squawfishPtychocheilus luciusinhabiting the upper Colorado River by using data from fish captured during 1990–1995. Mean annual growth rates of fish aged 3–6 years ranged from 32.2 (age 6) to 82.0 (age 3) mm/year. Growth rates for older fish were highest for fish 400–449 mm total length, TL, (42.7 mm/year) and declined to 19.8 mm/year for fish 500–549 mm TL. Fish 550 mm and longer grew an average 9.5 mm/year. Survival rates for fish 550 mm and longer were estimated by comparing measured size distributions with simulated stable age and size distributions; these ranged from 0.83–0.87, with the best fit at 0.85. Though lack of historical data precludes comparisons with past growth and survival rates, our data serve as a baseline for future population monitoring efforts.
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