Lion Fish live a life span of 5-10 years. And researchers have determined that Lion Fish reach sexual maturity within their first two years of life. Lion Fish reproduce when a female releases an egg and the sperm fertilizes it in the water. The new larva drift in the water for about 20-40 days. When this time is up the larva are capable of swimming, they swim out of the current, and find somewhere to live. This way of life is why it is so easy for Lion Fish to migrate. Rather than staying home with mom and dad, they drift off and find somewhere to suit their habitat standards.