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Growth of experimental groups of C. virginica. The mean shell height of 30 randomly selected animals from each triplicate bag was determined and then used to derive the mean shell height of each experimental group. Symbols: ▵, single FSSW treatment; ○, single sulfadimethoxine-ormetoprim treatment; □, single norfloxacin treatment; ▴, repeat FSSW treatment; ●, repeat sulfadimethoxine-ormetoprim treatment; ■, repeat norfloxacin treatment.
