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
©1978 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, 85(2), 62-65.
Available at: https://scholarworks.uni.edu/pias/vol85/iss2/5