Excrement production by brown mussels Perna perna ( L . 1758 ) under static conditions

This study aimed to find the excrement production in static conditions by the brown mussel Perna perna collected in artisanal farms considering different size classes. Eleven experiments were conducted with mussels classified into three size classes (I: <40 mm; II: 40 to 70 mm; III: >70 mm of shell length) in experimental units with absence of food and controlled temperature and salinity. The results showed that the amount of excrements produced varied significantly as size classes and also through the experiments. There was a mean of 4.19 ±0.27, 6.37 ±0.29 e 9.86 ±0.40 mg/h of excrement production for mussels of classes I, II e III, respectively. The results can be employed to support hydrodynamic models of biodeposition in mussel farms, which is a fundamental information for the definition of monitoring strategies.

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