The quest for the perfect halfmoon by selectively breeding for branching and straight caudal edges has given rise to a new development in the betta splendens tailforms - the Rosetail.

• 为追求最完美的半月斗鱼，经由淘汰育种，培育巨大或直挺的尾鳍，斗鱼尾鳍样式已经演化出一新的支系，著名的玫瑰尾斗鱼。