The World’s Smallest Fish – Stout Infantfish
Stout infantfish, also known as Schindleria brevipinguis, is a species of fish in the genus *Schindleria*, found in the waters near the Great Barrier Reef in the Western Pacific.
There are approximately 30,000 species of fish in the world, with the whale shark being the largest, measuring over 10 meters in length. The smallest fish is believed to be a species found off the coast of eastern Australia near an island, often called the 'Stout infantfish'. The Stout infantfish is slender in appearance, resembling a small worm, and possesses no fins, no teeth, and no scales. Its body is translucent except for the eyes, and has no pigmentation. Stout infantfish typically live for about 2 months, with females capable of laying eggs at 2-4 weeks of age.
The Stout infantfish, which holds the title of the world’s smallest fish, can only be found in a small area off the coast of eastern Australia. In 1979, scientists first discovered this tiny fish, and it was then classified into its genus.
The living environment of the Stout infantfish. According to research, this fish lives in tea-colored water, with an acidity at least 100 times that of rainwater. In the past, researchers believed that such acidic swamps were unlikely to support any animal life. However, recent research has shown that even in such water, many unique aquatic organisms such as the Stout infantfish can survive. A recent report issued by the Royal Society of Britain points out that this fish’s male fish possesses large abdominal fins and muscles, which can be used for reproduction.
A zoologist at the Natural History Museum in London stated: ‘It is the strangest fish I have seen in my career. It is small, lives in an acidic environment, and possesses bizarre fins. However, its habitat is threatened, so I hope we can find more of these fish before they are completely extinct.’ The swamps where these fish live are threatened by land clearing by farmers and ranchers, as well as illegal logging.
The Stout infantfish, which holds the title of the world’s smallest fish, can only be found in a small area off the coast of eastern Australia. Scientists have registered this fish as a new species and submitted it as the smallest vertebrate to the Guinness World Records.
The Sydney Australian Museum researchers revealed that this fish is the smallest and lightest vertebrate, but its name is funny, 'Stout infantfish'. The male fish has an average length of only 7 millimeters, and the female is about 8.4 millimeters on average.

Stout infantfish are found in the Western Pacific Ocean, living around the Fish Eagle Reefs, Carter Reef, Lizard Island, and other areas near the Great Barrier Reef.

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