Most of the hundreds of regulations concerning lobster fishing apply to commercial fishermen. In some states you need a saltwater fishing license to catch lobsters; in Hawaii, no license is required unless you want to sell your catch. A residential license in Maryland allows you to use two lobster pots to trap lobsters. New fishermen sometimes have to wait for someone else to retire before they can get their own commercial lobster license. Some states allow commercial fisherman to use as many as 800 lobster pots. The design of the lobster pot has not changed much in the last 200 years.