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Body form of the Central Stoneroller varies from slender to moderately stout. They are slightly compressed laterally with a definite arch in the back. The horizontal mouth is sub-terminal and lacks a barbel. A cartilaginous and chisel-shaped lower jaw is a distinct characteristic of this genus. Slender arches support the slightly hooked pharyngeal teeth, which are arranged in a 4-4 pattern. The lateral line is complete, with 49 to 55 scales, and the circumferential scale counts (around the body frontal of the dorsal fin) range from 39 to 55. Dorsal and pelvic fins ray count are 8, while the pectoral fins have 15 rays and the anal fins 7 rays. The long intestine is usually wrapped around the air bladder, and it is covered by a black peritoneum. The body is brownish-olive with a brassy luster above and silvery to white beneath. Body sides are marked with scattered dark scales, giving the fish a mottled appearance. Spawning males develop a dark bar across the anal fin and have tubercles on their back, top of the head, and between the nostrils.
The Central Stoneroller ranges throughout the northeast two-thirds of Iowa and along the entire length of the Mississippi River. It is occasional to common at most locations.
Stonerollers feed by scraping the algae and bottom ooze from submerged objects.
State Records are not documented for non-game species.
Spawning males develop a dark bar across the anal fin and have tubercles on their back, top of the head, and between the nostrils, as shown in the photo above.
The Central Stoneroller is found throughout Iowa, except for extreme southwest Iowa. It is found along the entire length of the Mississippi River. One of Iowa’s more abundant cyprinids, the Central Stoneroller is common in most stream fish collections
The Central Stoneroller lives in a variety of habitats ranging from very small streams to large rivers. Some researchers have found that the largest populations were found when a combination of habitats was available. These are the availability of many small streams having moderate to high gradients with sandy-gravel bottoms in which to spawn, moderate-sized streams with moderate gradients in which to summer, and larger streams of lower gradients in which to winter. In Iowa, the Central Stoneroller is a small creek inhabitant, reaching its highest abundance in coolwater streams. In Missouri the central stoneroller occurs with highest abundance in streams with moderate or high gradients, well-defined rubble or bedrock riffles, and permanent flows. Collections have found that small populations could occasionally be found in upland impoundments as well. The Central Stoneroller prefers clear water but can tolerate turbidity if the bottom is free of silt, remains reasonably cool and is well oxygenated.
A small creek inhabitant, they are common in clear water streams and occasional to rare in larger, more turbid streams, reaching their greatest abundance in coolwater streams. Spawning activity peaks during April, when males excavate nests by moving gravel with their mouths or nudging it away with their snouts, giving rise to their common name. Stonerollers feed by scraping the algae and bottom ooze from submerged objects. Adults may reach 7 inches in length.
Recent stream sampling information is available from Iowa DNR's biological monitoring and assessment program.
Harlan, J.R., E.B. Speaker, and J. Mayhew. 1987. Iowa fish and fishing. Iowa Conservation Commission, Des Moines, Iowa. 323pp.
Loan-Wilsey, A. K., C. L. Pierce, K. L. Kane, P. D. Brown and R. L. McNeely. 2005. The Iowa Aquatic Gap Analysis Project Final Report. Iowa Cooperative Fish and Wildlife Research Unit, Iowa State University, Ames.
Photo credit: Photo courtesy of Garold W. Sneegas, copyright Garold W. Sneegas