sentences:  Fish of this genus are characterised by their elongate and laterally compressed caudal peduncle, the dorsally-directed serrations on the posterior edge of the dorsal fin spine, gill membranes united at the isthmus, and a long adipose fin without a free posterior margin.These fish can grow between about 20–40 centimetres (8–16 in) in length.The coloration of "Bagrichthys" species varies from tan to black; however, coloration can vary between individuals based on environmental conditions.