Depuration of a Freshwater Clam (Batissa Violacea) from Rewa River in Fiji Using a Bio-Filter Set-Up in Closed and Open Water Circulatory System

The effectiveness of the freshwater bivalve Batissa violacea depuration was tested in closed and open water circulatory system over a 48 h period. included sand biofilter. Microbial levels were assessed every 4 using Total Aerobic Plate Count (TPC) for heterotrophs Most Probable Number (MPN) coliforms. TPC coliform loads tissue reduced rapidly to low undetectable while showed slower reduction. Both remained above detectable throughout Closed similar patterns logarithmic reduction coliforms all cases with R2>0.95 p<0.001. Similar results observed tank however, slower. Biofilm formation interior walls aquarium tanks cases. Physicochemical parameters did not show any significant change. load B. suggests that biofilter is simple, cost-effective, conserving effective way significantly reduce spoilage bacterial accumulated clams.