koi goldfish, commercial aqua trade breed of wild carassius auratus carp, curious and cute comet-like long tail ornamental fish

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