Just ran across this yesterday - Osprey fishing trips out of South Padre runs 12 hr tuna trips on Wed and Fri. Looking over their catches, it appears that they average 2-4 blackfin per person, but that doesn't seem bad for a partyboat day trip.
At least, it's worthwhile if you're gonna be down there anyways.
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Let's see ... transom saver stowed, fuel & oil full, fishing rods racked & ready ... bilge plug - where's the bloody bilge plug?!?!
Usually once a day, maybe more depending on if I feel like wiping or not.