Belontia hasselti is a type of freshwater fish that inhabit swamp waters. Information on biological, including morphometric, meristic, and growth patterns of the fish is rare. To understand the morphometrical and meristical characteristics, and growth patterns of the fish, a research had been conducted from February to March 2018. There were 100 fishes (70.08-130.05 mm TL and 7.44-40.02 gr BW).…