Submarine fish can grow up to 17 centimeters and live up to 10 years.

The adult submarine fish is about 10 to 17 cm long, with a transverse oval body shape, a thick round head, and a pair of large protruding eyes that are very attractive, with predominantly black pupils that can also be blue-green in color. The body surface is smooth and scale-free. The fins are translucent, no ventral fins, the caudal peduncle is vertically flattened and open in the shape of a fan, and it only relies on the pectoral fins and the short dorsal and anal fins to swim, and the speed of each fin's flap is quite fast, but it is not famous for its swimming speed.

Above the pectoral fins, the skin above (including the back) has a golden-yellow (greenish) sheen, with black rounded spots interspersed, similar to a leopard's pattern. Below that (including the belly) the skin is a clean white patch. There is a particularly bright patch of gold (fluorescent greenish) on the forehead. Shades of body color in the water can change depending on mood or health.

Expanded Information:

The dinghy is a miniature triggerfish that lives in the tropical vapor domain. The so-called "vapor zone" is the mouth of a river, where freshwater fish and saltwater fish are separated. The specific gravity of the water in the vapor zone changes every day due to the inflow of river water and the tides of the sea. Any water with a specific gravity between 1.002 and 1.018 is called a vapor field.

General fish can not withstand this kind of specific gravity (osmotic pressure) of the drastic changes, so the river into the sea is not much fish. Dinghies have an innate resistance to osmotic pressure that is not found in ordinary fish.

This ability allows the dinghy to move freely among fresh water, vapor water, and seawater without any restriction at all. However, in terms of the feeding environment, it is still necessary to simulate the growing environment of soda water. If kept for a long period of time in fresh water or seawater, the dinghy will slowly lose its vigor and even die quickly.