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Greater Redhorse Ontogeny - Grand River, Ontario - 1997, 1998


Post-Hatch Developmental Stages of Greater Redhorse (Moxostoma valenciennesi)
Drawings by John Cooper

Lateral, dorsal and ventral views of greater redhorse protolarvae (top—10.4 mm, bottom—11.3 mm)


Lateral, dorsal and ventral views of greater redhorse mesolarvae (15.3 mm)


Lateral, dorsal and ventral views of greater redhorse metalarvae (17.6 mm)

Bunt C.M. and S.J. Cooke. 2003. Ontogeny of Larval Greater Redhorse  (Moxostoma valenciennesi). American Midland Naturalist. 151:93-100

Abstract – Adult greater redhorse Moxostoma valenciennesi, were seined from the Grand River, Ontario, and artificially spawned in May 1997 and May 1998, Eggs hatched after 6-8 d at a mean temperature of 19 C. Eggs and larval development of 9-22 mm specimens are described. Ontogeny of larval greater redhorse was compared to that of other syntopic Moxostoma species from previously published studies, including river redhorse ( M. carinatum), black redhorse (M. duquesnei), golden redhorse (M. erythrurum), shorhead redhorse (M. macrolepidotum), coper redhorse (M. hubbsi) and spotted sucker (Minytrema melanops). There was significant overlap between most meristic variables that were compared. However, the majority of greater redhorse ( up to 18-mm) have myomere counts (27-33 pre-anal myomeres, 9-10 postanal myomeres and 39-42 total myomeres) that are different from other sympatric redhorse species and spotted suckers and may allow identification of greater redhorse as small as 9-mm.

BLACK REDHORSE (Moxostoma duquesnei) ECOLOGY



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