Answer:
If the marlin weighs over 1,500 pounds, and it "dresses out two thirds of that," that means that the weight of the meat that can be harvested from the marlin is 2/3 of 1,500 pounds, or 1,000 pounds (since 2/3 x 1,500 = 1,000).
If the price per pound is thirty cents, then the total value of the meat is 1,000 x 0.30 = $300.