Green Puffer, Tetraodon fluviatilis

The Green Puffer (Tetraodon fluviatilis) is a species of pufferfish.

It can be found in Asia, specifically in waters in and around Bangladesh, Sri Lanka, India, and the Philippines. Its habitat includes rivers, lakes, and flood plains. It resides in fresh water to slightly brackish water.

This species of fish is mostly carnivorous, eating mollusks, invertebrates, crustaceans, and some small fish. While in captivity, it will eat some vegetation and commercial fish food. This green pufferfish has a sharp front beak, allowing it to crush shellfish and crabs.

It achieves a length of up to 6.7 inches in total length, with a white underbelly and a metallic yellow or green colored top covered in black spots, bulging eyes which are a metallic blue in color, and a very thick and broad forehead. The body usually has a leathery texture, but green pufferfish that are grown in captivity have a tendency to have smoother skin. Its flesh contains a virulent toxin and it should not be eaten.

The fish is generally peaceful; however, it becomes more aggressive as it ages. The green pufferfish has the ability to scare off predators by inflating its body with both air and water, more than doubling its size. The majority of pufferfish have spines on them as well, and these usually help ward off predators also.

Image Caption: Green pufferfish (Tetraodon fluviatilis) at the New England Aquarium, Boston MA. Credit: Steven G. Johnson/Wikipedia (CC BY-SA 3.0)