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This fish is best described as a deep bodied, silvery fish whose head and body slope steeply up from the snout to the dorsal fin, resulting in a hump-backed appearance. It has a long dorsal fin that is divided into two lobes. The first has 8 to 9 spines, and the second has a single spine with 24 to 32 soft rays. The anal fin has 2 spines with the second spine larger than the first. The pelvic fin has one spine with 5 rays. Ctenoid scales cover the body and upper head. The lateral line is complete and extends through the caudal fin. The back is gray, with the sides silvery and belly and lower region of the head white. Adults commonly weigh up to 5 pounds.
The freshwater drum is a common fish species in the Mississippi and Missouri Rivers and a large interior streams over most of the state. It is also found in the large flood control impoundments and in some of the larger and deeper natural lakes. Drum are very tolerant of turbidity and prefer quiet waters without swift currents.
The drum spends most of its time on or near the bottom feeding mainly on fish, crayfish, and immature insects.
46 pounds, 0 ounces - Spirit Lake, Dickinson County, October 1962 - R.F. Farra, Clarion, Iowa
Drum are bottom feeders that can be caught easily from the bank on nightcrawlers.
The freshwater drum is usually found in shallow or muddy areas of large lakes, deep backwater pools of large rivers, and in reservoirs at depths of 30 ft or more. The freshwater drum avoids high-gradient streams, waters with swift current and shallow, weedy areas, but can tolerate high turbidity. The freshwater drum feeds near the bottom and spawns in open waters.
The freshwater drum reaches greatest abundance in large rivers, such as the Missouri and Mississippi, and can also be found in larger inland rivers and streams of Iowa. It is less common in the interior streams of northeast Iowa. The freshwater drum can be found in the larger impoundments, reservoirs and deep, natural lakes in the state.
The drum spends most of its time on or near the bottom feeding mainly on fish, crayfish, and immature insects. Moving slowly along the bottom, it moves small rocks and other bottom materials with its snout, capturing displaced aquatic life. In the Mississippi River, drum spawn during May and June when the whater temperatures range from 66 to 72 degrees F. Unique to the freshwater fish species in North America and characteristic of many saltwater fish, the eggs and larvae are bouyant and float on the water surface during development.
Growth studies in the Mississippi River report that freshwater drum average 5 inches in total length by the end of the first year of life and 8.0, 12.0, 13.5, 15.0, 17.0, 18.5, and 19.5 inches in succeeding years. Fast-growing drums in the Mississippi River reach 7 to 8 years of age, seldom more than 10 years, but there is a record of a 17 year old specimen.
The drumming sound made when the fish is handled is produced by a special apparatus that is located in the body cavity, which is connected with the swim bladder. Two enlongated muscles move a tendon over the swim bladder and produce the sound. Only sexually mature males possess this structure. Another unique feature of the drum is the large-sized otolith located in the sacculus. It has white, enameled surfaces and alternating light and dark bands that can be used to age the fish. Otoliths are often kept by fishermen for lucky pieces and sometimes made into jewelery.
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.
Illustration by Maynard Reece, from Iowa Fish and Fishing.