CREATE TABLE table_62121 ("Date" TEXT, "Ship Name" TEXT, "Tonnage" FLOAT, "Ship Type" TEXT, "Location" TEXT, "Disposition of Ship" TEXT)

What is the Ship Type of the Prize Disposition of ship and a tonnage less than 151?
SELECT "Ship Type" FROM table_62121 WHERE "Disposition of Ship" = 'prize' AND "Tonnage" < '151'
SELECT "Ship Type" FROM "table_62121" WHERE "Disposition of Ship" = 'prize' AND "Tonnage" < '151'