Growth rates of unclassified mussels collected from hydrothermal vents on the Pacific Ocean (2500 m) are among the highest recorded for deep-sea species. Mature mussels have mean growth rates of about 1 cm yr-1 which are comparable to growth rates of shallow water mussels....
Rhoads, Donald C., Richard A. Lutz, Robert M. Cerrato, and Eugene C. Revelas. 1982. "Growth and predation activity at deep-sea hydrothermal vents along the Galápagos Rift." Journal of Marine Research 40, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1594