Effect of Environmental Variables upon Crappie Young, Year-Class Strength, and the Sport Fishery
- 1 November 1991
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 11 (4) , 534-542
- https://doi.org/10.1577/1548-8675(1991)011<0534:eoevuc>2.3.co;2
Abstract
Abundance of juvenile crappies Pomoxis spp. was positively related to floodwater storage in Rathbun Lake, Iowa, from 1972 to 1980. Regression analysis showed that age-0 crappies less than 15 d old increased by 1,330/acre for each million acre-feet–days of water stored above conservation pool from April through August. However, this relationship did not hold for data collected from 1981 to 1989. Abundance of crappies less than 15 d old was also positively related to numerical catch in the sport fishery 2–4 years later. Effects of temperature, wind, substrate, and turbidity on catch of age-0 crappies in townets from 1980 to 1983 were investigated. Once a spawning threshold temperature was attained, turbidity was most influential in determining age-0 crappie densities. About 50% of the variability in larval crappie abundance was explained by turbidity, exclusive of water level. The relationship between substrate firmness and larval crappie abundance was best described by a parabolic function; modera...Keywords
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