Most first mates are paid by tips, so it does very greatly. Had trips where i gotten 200 in tips, had trips where I was left 0. The total number of trips run will also effect the total earned. Some boats are out almost every day, some only a couple times a week. Some capt do have a min guaranteed pay, some don't. Just too many variables to answer your question.

I can honestly say I don't do it for the money, I could make more at my auto shop than as first mate. I do it cause I love fishing, love being out on the water and helping others fish. The only draw back I have seen is after a full day out there, there isn't much time in the summer to get my own freezer full. But I guess that's what Nov is for.