ABSTRACTThe aim of this study was to evaluate the bioremediation of effluents in the biofloc culture of shrimp juveniles using clams, seaweed and fish. Four treatments were considered: CLT – without bioremediating organisms; AB – using Anomalocardia brasiliana; GB – using Gracilaria birdiae and ON – using Oreochomis niloticus with 2.5 kg wet weight per m3 of shrimp effluent. In the AB treatment, significant differences were observed in the effluent at the end of the experiment (96 h) for values of nitrite-nitrogen, nitrate, alkalinity, TSS and orthophosphate. The ISS and VSS levels recorded for the AB treatment varied respectively from 336 to 127 mg L−1, and from 505 to 130 mg L−1, with a corresponding gradual reduction of approximately 62% and 74% at the end of the experiment. The use of a clam species to treat effluents in a biofloc system with salinity near 25 g L−1 reduced waste solids and increased the nitrification process from 72 to 96 h, indicating that this clam can be used as a bioremediator and contributes to effluent treatment in shrimp.