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Age, growth and mortality of black redhorse ( Moxostoma duquesnei ) and shorthead redhorse ( M. macrolepidotum ) in the Grand River, Ontario
Author(s) -
Reid S. M.
Publication year - 2009
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2009.01214.x
Subject(s) - biology , sucker , range (aeronautics) , fishery , population , ecology , zoology , demography , composite material , materials science , sociology
Summary Despite comprising a large portion of riverine fish biomass, very little demographic information is available for redhorse sucker ( Moxostoma spp.) populations in Ontario (Canada). Information is presented on size and age structure, growth, and mortality of black redhorse ( M. duquesnei ), a threatened fish species, and shorthead redhorse ( M. macrolepidotum ) in the Grand River, Ontario. Estimates of body condition, adult mortality, longevity, and maximum attained length were very similar for both species. However, the more abundant shorthead redhorse reached maturity at a smaller size and younger age and grew at a slower rate than the black redhorse. Compared to populations in more southerly parts of its range, Grand River black redhorse grew more slowly, matured later and at a larger size, reached a higher maximum length and age, and was characterized by lower adult mortality rates. Reflective of its central location in the species range, the age and length characteristics of the Grand River population of shorthead redhorse were intermediate of, and overlapped with, other sampled populations.