sentences:  Large numbers of "B. melanopterus" are exported for the aquarium trade from Thailand, but these are all captive bred.Cyprinid fishes of the genus "Balantiocheilos" are easily distinguished from other members of the family by the presence of thick and fleshy lips, the lower lip bearing a large lobe that is deeply incised medially along its posterior edge and black along the distal margins of the dorsal, caudal, anal and pelvic fins.The posterior margin of the lower lip has often been described as forming a posteriorly opening pouch or pocket between the lip and the skin of the throat.