Commercial open-boat whaling by American and European ships occurred in the Sea of Okhotsk from the 1830s to the early 1900s. They primarily caught right and bowhead whales. Both populations of these species declined drastically, with the latter once thought to be extinct by western historians. Peak catches were made in the 1840s and 1850s. It is estimated that as many as 15,200 bowheads and 2,400 rights were taken in the sea.