In terms of individual fish weight, it’s the Chinese koi called the Yangtze River giant. Found in China’s Yangtze River, these animals can grow to upwards of 6 feet (1.8 meters) in length and weigh around 30 pounds (13.6 kilograms), making a single fish over three feet (0.9 m) long the size of some small dogs.
The fish have long been believed to be sacred to the Chinese. They are believed to be descendants of the legendary koi used to create the world.
The fish have been known by similar names in a wide variety of languages. They appeared in Japan as okame and karasoi, and they’re called “carp” in some languages.
What kind of fishes are they? These are the giant, goldfishes found in the Yangtze basin areas in China, and also in Asia, specifically in the basins of China, Vietnam, and the Philippines. For the most part, they’re goldfish that can grow at least as long as 2-4 feet (60-120 cm) and weigh 20-45 kg, or about 45-110 pounds. These fish can also be found in lakes and are quite plentiful in China, where the culture of fish-raising and the desire to display some fish has made this the case.