This is what I did when I won the LT Div. a bunch of years back.

I had already agreed with my fishing partner that we would split things 50/50 if one of us was lucky enough to win something. We split all costs as well. Gas, bait, lures, lodging, etc.

I reeled in the winning fish so I was the one who entered the fish at the weigh station. That night (Sat.) we won a Penn downrigger. The fish held until the end of the derby. I claimed the boat so I was the one to give my SS number. We had a friend come up to tow the boat home. Was told that the boat had a value of about $10K by the marina that supplied the boat. Put a for sale sign on it and sold it for $8K 2 weeks later. Paid my fishing partner by check and got his SS number. Come tax time, I had my accountant send my fishing partner a form for half of what I was taxed/ won by the Winni derby people. The Penn DR was sold and we split the $$ we got for it as well.

Fair is fair. We each paid our taxes for what we got.

Just make sure you are clear with the people on the boat before you start the derby.