Life History
Genus Ictiobus are large, robust bodied suckers adapted to large rivers. Currently recognized species are readily diagnosed by morphological characters, and the group is known from fossils dating back to the Miocene. I. niger is a spring spawner. They spawn in flooded areas and backwaters of sloughs and small to large rivers... Fertilized eggs are demersal and adhesive. They hatch in 24–36 hours at 19-24°C. I. niger grows fairly raid averaging 134 mm after the first year. I. niger is sexually mature at age 2. The spawning period could take days. The spawning fish remain in a state of excitement, and are unconcerned about unusual movements or disturbances. I. niger has been reported violently jumping and repressed eagerness while spawning. It was not until the spawning was drawing to an end that the fish seemed to recover normal reaction to alarm.
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