Stormfins were large fish native to the planet G0-CVII. Their scales were very smooth and ranged in color from off-white to a medium bluish-gray, often darkening slightly as they aged. Adult stormfins could grow to a length of 1.4 meters with a width of 45 centimeters. At the end of the second year, the stormfins swam back north as the ice broke up and melted, carrying them back to the north and south. They laid eggs throughout the spring and summer, and in the fall made their last journey to the equator. Most stormfins die in their third year; a few survive one more year of maturity.