Bidyanus welchi are found in turbid water in slow flowing rivers and waterholes. They can tolerate high salinities and high temperatures. It is a carnivorous species which preys on smaller fishes as well as crustacea and worms. Spawning takes place in the summer when the watercourses it inhabits flood. The eggs are pelagic and are laid upstream after the fish migrate there, they hatch after around 30 hours. The male guards and fans the eggs. They attain sexual maturity when they reach a length of about . A female of length may lay up to 100,000 eggs.
