Elephant koi

Elephant koi are gigantic, brightly colored fish. They are Kyoshi Island's main export, and are fished for their meat, blubber, and oil.

History
Elephant koi were first seen when Team Avatar came to the island specifically so Aang could ride one. Aang managed to ride an elephant koi gracefully, at least until the unagi, their natural predator, showed up. The koi quickly dispersed, leaving Aang to fend for himself.

Anatomy
Elephant koi are enormous fish, around forty to fifty feet long; they are the biggest herbivores in Kyoshi Bay. They are a light shade of yellow with broken orange patterns down their back, on the tops of their heads between the eyes, on the tips of their fins, and in a small circle around the base of their tail. Variations of this color pattern can be seen on most elephant koi. While elephant koi are large in size, they are also prey to the much larger Unagi.

Connection
Koi are a domesticated, very colorful variety of the common carp and are closely related to the goldfish. Around 200 years ago, the Japanese noticed the beautiful color patterns on some of the carp and bred them for these markings. The elephant koi share no real similarities to elephants, and are most likely named due to their enormous size.

Behavior
The elephant koi is generally a docile creature, but, when disturbed, it becomes hostile and frantic. Elephant koi can leap more than twenty feet into the air when startled. They can be ridden if caught, though apparently this is quite difficult due to their quick speed and large size. Their natural predator is the unagi.