How does a lobster grow?

Lobsters grow by molting. This is the process in which they struggle out of their old shells while simultaneously absorbing water which expands their body size. This molting, or shell-shedding, occurs about 25 times in the first 5-7 years of life. Following this cycle, the lobster will weigh approximately one pound and reach minimum legal size. A lobster at minimum legal size may then only molt once per year and increase about 15% in length and 40% in weight. No one has yet found a way to determine the exact age of a lobster. However, based on scientific knowledge of body size at age, the maximum age attained may approach 100 years. They can grow to be 3 feet or more in overall body length.