The North Pacific Fur Seal Act gradually began increasing the endangered sea otters population. The Alaskan Department of Game began hunting the otters to collect their pelts for data in 1950. This caused the otter population to yet again decrease. In 1972, the Marine Mammal Protection Act was passed, which banned the hunting of otters in the United States waters. Only Native Alaskans are permitted to hunt the otters but only under certain circumstances and limitations. With this act in place, the sea otter population quickly began to thrive.
Just as the population began to thrive, the sea otter population took a huge loss. In 1989, the Exxon Valdez oil spill is believed to be responsible for about 10,000 otter deaths. After the oil spill occurred, it appears the otter population is continuing to decrease due to the acts of mankind and nature. Since the oil spill, the otters have yet to regain a steady population, causing them to remain on the endangered species list.