Freshwater Drum (sheepshead)
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Name and Code
Family
Sciaenidae - drums and croakers
Species
Aplodinotus grunniens
Taxonomic Authority
Rafinesque, 1819
Common Name(s)
Freshwater Drum (sheepshead)
French Name
malachigan
OMNR Code
371
Family TSN
169237
Parent TSN
169363
Species TSN
169364
Conservation Status
Global Rank (GRank)
G5 (2015-08-17)
National Rank (NRank)
N5 (1996-09-05)
Provincial Rank (SRank)
S5 (1988-11-22)
COSEWIC Status
none
SARO Status
none
AFS Status
none
Ecological Value
Ontario Origin
native
General Abundance
common
Tolerance
tolerant
Economic Importance
commercial fishery; sportfish (incidental)
Habitat and Feeding
General Habitat(s)
lacustrine; riverine
Environment
benthic
Trophic Class
invertivore/carnivore
Thermal Regime
warmwater
Habitat Preference
sandy, silty bottoms of lakes and reservoirs (to 18 m), and pools in low to moderate-gradient, often turbid, rivers; preferred water temperature range 24-28°C
Reproduction
Reproductive Guild
Nonguarders: Open substratum spawners: Pelagophils
Spawning Habitat(s)
lacustrine; riverine
Spawning Season
spring-summer
Spawning Month(s)
May-July
Spawning Temperature (°C)
18-26
Fecundity
27,400-850,000
Nursery Habitat(s)
lacustrine; riverine
Size and Age
Adult Length (cm)
29.2-71.0 TL
Adult Weight (kg)
0.3-5.3
Age at Maturity (yrs)
3-5 (m); 4-6 (f)
Maximum Length (cm)
121.9 TL
Maximum Weight (kg)
27.7
Lifespan (yrs)
21 (m); 32 (f)*
Ontario Range Map
Freshwater Drum (sheepshead) range
Ontario Distribution
Upper St. Lawrence River, Ottawa River, Lake Abitibi, Lake Nipissing, Lakes Ontario, Erie, St. Clair and tributaries, southern Lake Huron
Photograph
Freshwater Drum (sheepshead) photograph
Notes
* - maximum ages of 58 (Wisconsin) and 71 (Minnesota) reported; eggs are buoyant and float on the surface; tolerant of turbidity
Ontario Records
Record Length (cm)
88.9 TL
Record Weight (kg)
9.77
Information Sources
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