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Koi (鯉, Japanese:, literally "carp"), or more specifically nishikigoi (錦鯉, Japanese: [ɲiɕi̥kiꜜɡoi], literally "brocaded carp"), are colored varieties of carp (Cyprinus sp.) that are kept for decorative purposes in outdoor koi ponds or water gardens. Koi is an informal name for the colored variants of carp kept for ornamental purposes.
They swim with their mouth wide open and their opercula fully expanded. Every several feet, they close and clean their gill rakers for a few milliseconds (filter feeding). The fish all open their mouths and opercula wide at the same time (the red gills are visible in the photo below—click to enlarge).
The term "fish" describes any non-tetrapod chordate, (i.e., an animal with a backbone), that has gills throughout life and has limbs, if any, in the shape of fins. [8] Unlike groupings such as birds or mammals , fish are paraphyletic , since the tetrapod clade is within the clade of lobe-finned fishes.
Barbel sketch Koi carp have two pairs of barbels, the second pair being quite small. This Asian arowana has large, protruding barbels. In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth (sometimes called whiskers or tendrils).
Hanako (Japanese: 花子) (purportedly c. 1751 – July 7, 1977) was a scarlet koi fish reportedly owned by several individuals, the last of whom was Komei Koshihara. She was reported to be the longest-lived koi fish ever recorded, having died at the age of 226, although there is dispute as to the veracity of her longevity.
Although the Cyprinodontiformes are a diverse group, most species contained within are small to medium-sized fish, with small mouths, large eyes, a single dorsal fin, and a rounded caudal fin. The largest species is the cuatro ojos ( Anableps dowei ), which measures 34 cm (13 in) [ 2 ] in length, while the smallest, the least killifish ...
Four-stroke buccal pumping is used by some basal ray-finned fish and aquatic amphibians such as Xenopus and Amphiuma. [1] This method has several stages. These will be described for an animal starting with lungs in a deflated state: First, the glottis (opening to the lungs) is closed, and the nostrils are opened.
The architecture of the koi pond can have a great effect on the health and well-being of the koi. The practice of keeping koi often revolves around "finishing" a koi at the right time. The concept of finishing means that the fish has reached its highest potential. Koi clubs hold shows where koi keepers bring their fish for judging. [1]