Habitat Utilization, Movement and Use of Groundwater Seepages by
Larval and Juvenile Black Redhorse, Moxostoma duquesnei
Bunt, C.M., N.E. Mandrak, D.C.
Eddy, S.A. Choo-Wing, T.M. Heiman, & E. Taylor. 2013. Habitat
Utilization, Movement and Use of Groundwater Seepages by Larval
and Juvenile Black Redhorse, Moxostoma duquesnei.
Environmental Biology of Fishes. 96:1281-1287.
Black redhorse (Moxostoma duquesnei) larval and juvenile
habitat was characterized in the Grand River, Ontario from June
to September 2007-2012. Similar to adult black redhorse and
their congeners, larval black redhorse were most likely to be
located in clean, clear, stable runs with low to moderate flow,
over pebble, gravel and cobble substrate, mixed with sand. Areas
(n = 22) where 0+ black redhorse were observed and collected
were 1.4 ± 0.2 m from shore, with a mean water temperature of
22.0 ± 0.5°C, mean depth of 0.20 ± 0.02 m and mean water
velocity of 0.12 ± 0.05 m/s. . Larval and juvenile black
redhorse occupied riffles, runs, pools and backwater areas;
however, there was a strong preference for runs. Juvenile black
redhorse moved upstream in the early evening and at night to
over-wintering areas in the Grand River in November when water
temperature approached 5°C. The persistence of black redhorse
populations in the Grand River may be related to the presence of
groundwater, which provides refuge from extreme temperature and
poor water quality during the summer.