It also assures you of no surprises after the boat is underway, making the trip more enjoyable. The boat has docked and everyone is milling around. If you know nothing of filleting fish, most boats or docks will provide services for dressing your catch for you. Keep in mind, this may cost you extra. Another important thing to remember is that charter boat captains have helpers called mates.
Mates usually work for very little or no salary.
They make their money from tips, which are customary. So, remember all the hard work they did while you were enjoying yourself. Get all the questions about the actual trip out of the way before you book it. That way, you can focus on the fun.