Flathead chub, Hybopsis gracilis, age and growth, weight-length relationships, condition factors, fecundity
Aspects of the life history of the flathead chub were investigated between 7/15/75 to 8/31/76 in Perry Creek, Iowa, a Missouri River tributary. Age and growth data from 288 fish revealed that the population consisted of 4 age groups. Total lengths based on summation of increments averaged 78, 110. 132 and 150 mm for age groups I through IV. The weight-length relationship for preserved fish was log W = -1.7615 + 2.9802 (log L). The coefficient of condition for all fish was KSL = 1.7 and KTL = 0.96. Sexual maturity was reached when the fish were 2 years old and a standard length > 105 mm. Spawning extended from mid-July to mid-August. Mature females averaged 4,974 eggs/ovary. Perry Creek provided a stable environment for growth and development but no old or large chubs were taken. Destruction of chub habitat in the Missouri River and its tributaries is suggested as a possible reason for the paucity of older fish.
Proceedings of the Iowa Academy of Science
© Copyright 1978 by the Iowa Academy of Science, Inc.
Martyn, H. Al and Schmulbach, James C.
"Bionomics of the Flathead Chub, Hybopsis gracilis (Richardson),"
Proceedings of the Iowa Academy of Science: Vol. 85:
, Article 5.
Available at: http://scholarworks.uni.edu/pias/vol85/iss2/5