koi goldfish, commercial aquatrade breed of wild carassius auratus carp, curious and friendly comet-like long tail ornamental fish

adult animal anubias aqua aquaculture aquarium auratus background beauty breed bright burhead business carassius careful carp chinese clear coldwater colorful comet commercial condition controlled curious cute cyprinidae decorative ecology elegant fauna fish fishkeeping freshwater friendly full goldfish habitat hobby instinct its koi light little long low nature oriental ornamental plant planted protection shoal showing smart sociable species specimen tail tank threat trade underwater water widespread wild