In the years following the discovery of the islands, during the Maritime Fur Trade era, the islands were exploited by seal hunters, first from New England and later from Russia. The Russians maintained a sealing station in the Farallones from 1812 to 1840, taking 1,200 to 1,500 fur seals annually, though American ships had already exploited the islands. The "Albatross", captained by Nathan Winship, and the "O'Cain", captained by his brother Jonathan Winship, were the first American ships sent from Boston in 1809 to establish a settlement on the Columbia River. In 1810, they met with two other American ships at the Farallon Islands, the "Mercury" and the "Isabella", and at least 30,000 seal skins were taken. By 1818, the seals diminished rapidly until only about 500 could be taken annually and within the next few years, the fur seal was extirpated from the islands. Whether the northern fur seal or the Guadalupe fur seal were the islands' native fur seal is unknown, although the northern fur seal is the species that began to recolonize the islands in 1996.