More than 200 species of freshwater prawns, all members of the family Palaemonidae, are important to the commercial market. The most important belong to the genus Macrobrachium, and the freshwater shrimp most common to Western markets is the giant M. rosenbergii, also known as giant river prawn. It is found wild from Pakistan and northwest India to Malaysia, New Guinea, the Philippines and northern Australia and is farmed in freshwater areas throughout the world. In the United States, it is commercially farmed in Hawaii and experimentally in some southern states, notably Tennessee. This fast-growing shrimp can reach a weight of 4 to 6 ounces. In the wild, it can attain lengths of over 1 foot. In cultured ponds, it is generally harvested at 6 to 7 inches, or about six prawns per pound, head-on. There are limited markets for live or fresh giant prawns; most are sold as frozen tails.