S. Jerrine Nichols Jaquelyn M. Craig Jeffery D. Allen M. Glen Black John R. P. French III 2006 We investigated the <i>in situ</i> growth of juvenile zebra mussels (<i>Dreissena polymorpha</i>) in a reach of the Huron River (southeast Michigan) below a dam with a control gate that regulates water levels. Growth was significantly different among sample dates over a five-month-long monitoring season. Mean growth of mussels generally decreased from 0.093 mm/day just above the dam to 0.067 mm/day 4 km downstream, then increased to 0.091 mm/day at end of the 17-km-long study area. Significant differences among sites were most numerous in August during a severe drought when discharges fell substantially. Growth was positively correlated with discharges (R² = 0.94, <i>p</i> < 0.01). The positive correlation between growth and chlorophyll <i>a</i> levels in the study area, however, was weak (R² = 0.69, <i>p</i> < 0.1). Our study suggests that discharge may be one controlling factor for dreissenid populations in small streams. application/pdf 10.1080/02705060.2006.9664092 en Taylor and Francis In situ growth of juvenile zebra mussels in a regulated stream article