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Unwanted attention from whaling fleets
While the sei whale has been hunted by humans since the 1860s, it wasn't until the 1950s and 1960s and the declining availability of blue and fin whales that the killings seriously expanded.
Since 1985, the International Whaling Commission has officially halted all commercial whaling of this species. Today, 50 sei whales are killed annually by Japanese whalers in the North Pacific in Japan's "scientific whaling" programme.They are threatened by global warming, but they can also be harmed by pollution, shipping strikes and entanglement in fishing gear.