Marathon Offshore Bull and Cow Dolphin Tournament! A guaranteed grand prize of $10,000 cash is to go to the team that catches the largest bull and cow dolphin fish combined. However, according to organizers, the top prize payout increases as more boats register. With a field of 60-69 boats, the first-place cash award is to be $13,000, increasing incrementally by 10 boats. If a field of 100 boats is reached, the guaranteed first-place cash prize is $25,000. while other prizes are awarded to anglers catching the largest dolphin, wahoo, tuna and tripletail.