Timing and Demographic Characteristics of Redhorse Spawning Runs in Three Great Lakes Basin Rivers

摘要: ABSTRACT Boat-electrofishing surveys and fishway monitoring were undertaken to describe the characteristics of redhorse (Moxostoma spp.) spawning runs in Grand River, Muskegon River Trent River. Spawning began early May was complete by mid-June. Timing varied among species, rivers, years. Shorthead silver spawned earlier at lower water temperatures than black river redhorse. Differences between rivers years likely resulted from differences timing suitable flow levels, respectively. males generally smaller, more numerous, present areas females. While reached sexual maturity a younger age females, there no overall ages male female