Also called the Silas Barb and the Longfin Barb, the Arulius Barb is native to India. These fish are found throughout the Kaveri River basin in large streams, lakes and rivers. Adults of this species have olive brown bodies with lighter sides and transparent fins. The defining characteristic of these Barbs is the large black splotches that appear in the middle of the body, above the pelvic and anal fins as well as at the base of the caudal fin.