FishChecker

The Figure-Eight Puffer (Tetraodon biocellatus) is a captivating and intelligent freshwater pufferfish, renowned for its striking appearance and engaging personality. Its most distinctive feature is the intricate, figure-eight-like pattern of dark brown or black markings set against a vibrant yellow-gold or olive-green body, often complemented by iridescent green or blue speckles. These patterns are unique to each individual, making every fish a one-of-a-kind specimen. Growing to about 3-4 inches (7-10 cm), they possess the typical robust, somewhat blocky body shape of puffers, with large, expressive eyes that move independently. Figure-Eight Puffers are known for their inquisitive nature and can often be seen observing their surroundings with a keen interest. They are primarily a brackish water species, requiring a specific gravity of around 1.005-1.010 to thrive, although juveniles can often tolerate pure freshwater for a period. Their diet consists mainly of carnivorous foods, with a strong emphasis on hard-shelled items like snails, clams, and various crustaceans, which are crucial for naturally wearing down their constantly growing teeth. They can be fin-nippers and territorial, so tankmates must be chosen with extreme care, ideally robust, fast-moving brackish fish that can hold their own. A well-maintained aquarium with plenty of hiding spots, rocks, and live plants (if salt-tolerant) will allow this fascinating species to display its full range of behaviors and colors, making it a truly rewarding pet for the dedicated aquarist.

Requires low-end brackish water. Species-only is best.