The Greenfin Shovelnose Puffer (Arothron immaculatus) is a marine fish commonly found in tropical and subtropical waters, widely distributed in the Indian Ocean and Western Pacific, including regions around Japan, Southeast Asia, and Australia. It belongs to the pufferfish family and has a typical shovelnose puffer appearance, with a round and slightly flattened body and a protruding snout, giving it a "horse face," hence the name.

The Greenfin Shovelnose Puffer has a unique coloration, with a green or bluish-green back and body, often with a metallic sheen. The edges of its dorsal and anal fins are vividly green. Its distinctive appearance makes it one of the iconic fish of tropical seas. Adults can grow up to about 40 cm in length, and while its flesh is somewhat firm, it is rich in protein and healthy fats.

It is an omnivorous species, primarily feeding on benthic invertebrates, small fish, and algae. They typically inhabit coral reefs and rocky areas, preferring shallow waters.

Although not as commonly used as other marine fish in Japanese cuisine, the Greenfin Shovelnose Puffer can still be found in high-end restaurants, often served as sashimi or grilled. Its delicious flesh and unique appearance make it a prized ingredient for seafood enthusiasts.