The present study was undertaken to evaluate the filtration efficiency of the bath sponge Spongia ceylonensis (Spongiidae) and fire sponge Tedania klausi (Tedaniidae) collected from Penghu. In the feeding experiements, live and algal powder of Tetraselmis chui (8-16£gm), Chaetoceros muelleri (6-9£gm), Isochrysis galbana (3-7£gm) and Nannochloropsis oculata (2-5£gm) were used to determine the clearance rate of sponges. Sponges S. ceylonensis and T. klausi showed selective feeding under various algal species, concentrations and conditions (live algae or powders). After 90 minutes, the clearance rate of T. klausi fed on N. oculata powder was 71 ml h-1 gDW-1 at algal concentration of 107 cells ml-1, but S. ceylonensis didn¡¦t feed at the same concentration. At 106 cells ml-1 concentrations, the clearance rate of S. ceylonensis fed on live I. galbana was 538 ml h-1 gDW-1 which was higher than T. klausi, i.e. 11 ml h-1 gDW-1. At 105 cells ml-1 concentrations, the clearance rate of T. klausi fed on live T. chui was 431 ml h-1 gDW-1 which was higher than S. ceylonensis, i.e. 23 ml h-1 gDW-1. At 104 cells ml-1 concentrations, S. ceylonensis fed on live T. chui with clearance rate 532 ml h-1 gDW-1, and T. klausi was 315 ml h-1 gDW-1. The results showed differential clearance rates of sponges depend on sponge species, algal species, concentrations and conditions (live or powder). In gerneral, sponge clearance rate is higher when feeds on live algae than algal powders. Although the filtration efficiency of algal powders is low, the advantage of low cost and high accessibility still make algal powder highly competitive in sponge aquaculture industry.