On average, a trap that is hauled containing at least 2 market sized lobsters is a good catch. Minimum and maximum size requirements exist for lobsters caught in Maine; the minimum size requirement being a length of 3 ¼ inches and the maximum being a length of 5 inches. The minimum and maximum size requirements are based on the length of the lobster’s carapace or body shell. To keep a lobster, it must fall between these two lengths, anything below 3 ¼ inches or above 5 inches in length constitutes an illegal lobster and therefore an illegal take. Lobstermen are equipped with a gauge to assure lobsters are within the size requirements.