The dwarf pufferfish, also known as the Malabar pufferfish, pea pufferfish or pygmy pufferfish, Carinotetraodon travancoricus is a small, freshwater pufferfish endemic to the River Pamba in Kerala, Southwest India. Maximum size is 22 mm (less than one inch), making it one of the smallest pufferfish in the world. Although closely related to marine pufferfish, they are not found in brackish or salt water, and reports to the contrary may be based on misidentification.
Also go check out 
