The Dusky Jawfish has a body that is thickly mottled with shades of dark brown and flecked with blackish spots. It is very active fish and is constantly looking for material to build up its home. The Dusky Jawfish is an amusing fish that spends all day poking its head out of its burrow and opening its wide mouth at any passing fish in an attempt to keep them away. It reaches up to 4 inches in length, is passive in nature and moderately hardy in stamina. The Dusky Jawfish needs to have a thick sand bed in the tank, since it mostly hangs out and loves to dig tunnels. It is mostly found to be active during daytime and less at night. The Dusky Jawfish does well in groups, but can also live alone. Since there is no distinguishing feature to differentiate males from females, breeding this species is hard in captivity. .