Koi fish
Koi are large, colorful, ornamental varieties of domesticated carp, known for their vibrant patterns (white, black, red, yellow, blue) and peaceful nature, symbolizing luck and perseverance; they are robust, omnivorous, grow big (up to 3 feet), live long (decades), and are kept in ponds worldwide, distinguished from goldfish by their barbels (whisker-like feelers) and larger size.