What is the Ship Type of the Prize Disposition of ship and a tonnage less than 151?
CREATE TABLE "first_raiding_cruise" (
  "date" text,
  "ship_name" text,
  "tonnage" real,
  "ship_type" text,
  "location" text,
  "disposition_of_ship" text
);
SELECT "ship_type" FROM "first_raiding_cruise" WHERE "disposition_of_ship"='prize' AND "tonnage"<151;