NEW YORK (Bloomberg) - Teekay Tankers Ltd., an operator of vessels that carry crude oil, will offer seven million shares, raising cash to buy a Suezmax-class ship for $57 million and pay down debt.

The shipowner will use the proceeds of the sale to buy the 2003-built Ashkini Spirit ship from parent Teekay Corp., according to a Market Wire statement.

Teekay Tankers fell 24 cents, or 2.2 percent, to $10.61 in New York Stock Exchange trading on Friday. They have fallen 16 percent this year.

The shipowner, based in Hamilton, Bermuda, now owns nine Aframax tankers and two Suezmaxes. Suezmaxes can carry one million barrels of oil, and Aframaxes about 600,000 barrels.