Came across this article on reddit of all places. Pretty interesting stuff!!
Animals That are Immortal or Long-lived Animals with "Negligible Senescence". didn't know W/O - Writer's Corner: General Non-Fiction - Epinions.com
Classic examples of species exhibiting both of these traits (mortality and immortality) are the Flounder and the Rockfish. The male Flounder reaches a fixed body size and ages normally, as most animals do, and dies soon thereafter. However, the female Flounder grows indefinitely and shows no signs of aging or loss of function with time. The Rockfish have both short-lived and long-lived members in the same genus. They range from 12 years for the calico rockfish to 205 years for the rougheye rockfish.
Animals That are Immortal or Long-lived Animals with "Negligible Senescence". didn't know W/O - Writer's Corner: General Non-Fiction - Epinions.com
Classic examples of species exhibiting both of these traits (mortality and immortality) are the Flounder and the Rockfish. The male Flounder reaches a fixed body size and ages normally, as most animals do, and dies soon thereafter. However, the female Flounder grows indefinitely and shows no signs of aging or loss of function with time. The Rockfish have both short-lived and long-lived members in the same genus. They range from 12 years for the calico rockfish to 205 years for the rougheye rockfish.