Biofloc Ltd.

The wels catfish's mouth contains lines of numerous small teeth, two long barbels on the upper jaw and four shorter barbels on the lower jaw. It has a long anal fin that extends to the caudal fin, and a small sharp dorsal fin relatively far forward. It relies largely on hearing and smell for hunting prey, but its eyes have a tapetum lucidum, providing the advantage of night vision, contrary to popular belief that the wels has poor eyesight. With its sharp pectoral fins, it creates an eddy to disorient its victim, which the predator sucks into its mouth and swallows whole. The skin is very slimy. Skin colour varies with environment. Clear water will give the fish a black color, while muddy water will often tend to produce green-brown specimens. The underside is always pale yellow to white in colour. Albinistic specimens are known to exist and are caught occasionally. The wels swims by undulating its long, muscular tail in a wave-like action, similar to crocodilians. They can also swim backwards.