The world’s smallest fish has been discovered in the peat swamps of the Indonesian Island of Sumatra. The picture on the right shows its size against a thumb. At maturity, the fish can be about 7.9 mm in length.
It's also the smallest vertebrate or backboned animal.According to the researchers, the fish live in dark, tea-colored water with an acidity of ph 3, at least 100 times more acidic than rainwater. Swamps like this were once thought to harbor very few animals, but recent research has revealed that they are highly diverse and home to many species that occur nowhere else.
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