Abstract. Streptomyces involves in the degradation process of organic compounds on the soils includingin mangrove forests. In this process, Streptomyces secretes several enzymes to convert the substrates into other substances which will readily be available for detritus feeders including nipah worms (Namalycastis rhodochorde). This study investigated the enzyme activities of six Streptomyces spp. that have been isolated from mangrove soil in Sungai Kakap District, West Kalimantan. Enzymatic activities were detected on four different media: CMC-congo red agar, skim milk agar, gelatine nutritive agar, starch casein agar. Catalase activity was detected using 3% of H₂O₂ solution. The results showed that sixStreptomyces spp. had proteolytic, cellulolytic, amylolytic, gelatin liquefaction,andcatalase activities. Streptomyces NrASA1 has the highest proteolytic activity index values, namely 0.57.Streptomyces NrASA3 and Streptomyces NrASA4 have the highest amylolytic and cellulolytic activity index values, respectively 0.76 and 1.15. The enzymatic activity profile of indigenous Streptomyces spp. can be utilized for the development of feed formula for nipah worm cultivation.

Streptomyces, cellulolytic, proteolytic, amylolytic, nipah mangrove