A diver on the ocean floor near a Bowhead Whale. Image courtesy of Brian Skerry.  Bowhead whales (Balaena mysticetus) weigh on average 100,000 kg, about the size of Boeing 757. That’s roughly 17,000 times larger than the rougheyed rockfish and 250,000 times larger than the red sea urchin. Longevity has been estimated at over 200 years by measuring changes in the eye lens crystallins in harvested animals. For more information on bowhead whale aging explore the Successful Aging library.

Photo: Brian Skerry
Red sea urchin (Mesocentrotus franciscanus).Red sea urchins (Mesocentrotus franciscanus) show no age-related decline in reproduction or age-dependent changes in mortality rate, suggesting they might not age. Using 14C dating, Ebert and Southon (2003) estimated that urchins they sampled in the wild were as much as 200 years old. A large urchin weighs about 300g — about the same as a box of pasta.

Read more about urchin aging in the Successful Aging library.
Rougheyed rockfish. The rougheyed rock fish (Sebastes aleutianus) is found in the north Pacific at depths ranging from 150 to 450 meters. Maximum recorded weight is 6.7 kg, the size of a large housecat. With no apparent decline in egg production at 80 years of age, this animal doesn’t appear to age. The oldest specimen collected off the coast of SE Alaska was aged at 205 years, using seasonal growth rings deposited on otoliths — calcareous bones of the inner ear.

To read more about this and other rockfish explore the Successful Aging library.