This study concerning high-density polyethylene fishing net disposal elucidated the parameters of reclaimed oil from discarded fishing nets, with marine diesel oil and marine gas oil as a reference for comparison, and then assessed its suitability for the operation of the high-speed diesel engines in fishing vessels. From the result of the property analyses, the reclaimed oil was a flammable liquid including the ingredient of gasoline, kerosene, and marine gas oil, the flash point was 1 degree Celsius, thus it is necessary to mix it with mixing marine gas oil or marine diesel oil to use as fishing vessel fuel oil, the filter-plugging temperature was 1 degree Celsius, thus indicating the need to consider the possibility of filter blockage in cold regions. On the other hand, from the result of the engine test, the reclaimed oil showed no problem as the fuel oil in high-speed diesel engine. The reclaimed oil and the marine gas oil showed no differences in fuel consumption adjusted for calorific value and exhaust gas temperature, and NOx, SOx, CO, and CO2 content in exhaust-gas with the reclaimed oil decreased in comparison with them in marine gas oil and marine diesel oil.
