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Representative electroretinograms from eyes of an uninfected yellow perch (Perca flavescens) and a perch infected with Diplostomum baeri. Arrows indicate the a-wave and the b-wave. The ERG waves were analyzed for amplitude and latency (time to peak). Note reduction in ERG b-wave amplitude and increase in b-wave latency recorded from the infected eye. Stimulus intensity units = μJ/cm2, time base = 0.27 s/div, amplitude = 15.5 mV/div.
