Fish waste from the fish processing industry were used as a raw material to produce biological silage. The technology used had been previously developed and tested to optimize the process. The degree of grinding, molasses concentration, process temperature, Lactobacillus plantarum inoculation, and utilization of tropical fruit wastes as a source of proteolytic enzymes were tested. Results indicated that after process and storage for 90 days at room temperature, a stable product is obtained by using no less than 15% of molasses and 10% of fruit waste, process temperature should be around 40 degrees C, the fish have to be ground to a very small particle size, and microbial inoculation is necessary.