Biodiesel has become one of the most versatile alternative fuel options for diesel engine applications. The recent biodiesel research in India receives its attention towards fish-oil based biodiesel. In the present work, biodiesel derived from the fish-oil extracted from fish species was used as fuel in diesel engine to investigate its performance, combustion and emission characteristics. The various blends of fish-oil biodiesel with diesel, B25, B50, B75, B100 were used in the experiments and the results indicate that brake specific fuel consumption and brake thermal efficiency were higher with B100 fuel than that of diesel. The combustion analysis shows that the peak cylinder pressures of B25, B50, B75 and B100 are lower than that of the diesel and the starts of combustion timing was taken place at earlier crank angle degrees for fish-oil biodiesels. The exhaust gas temperatures of B100 were lower than that of diesel at the different loads. At full load, B100 fuel produced higher smoke, NOx, CO and HC emissions of 34.95%, 1.65%, 14.6%, and 1.8% respectively with reference to diesel fuel.
