I worked a dragger of similar size during college summers. That thing is going to roll every which way in a seaway (swell/waves). You ain't headed for the Caribbean, either...
People are different about mal de mer. Not for sure - but very likely- you will be completely incapacitated for days. You'll be so sick that you'll ask the Captain for a medevac helicopter.
About the time you look in the mirror and see your anus sitting your tongue, you'll get very, very hungry and be able to eat greasy bacon and eggs standing on your head. You'll climb the rig and touch the truck in a seaway (bring your camera with the wide angle) and wonder how you could have been so foolish. The crew will stop avoiding you.
I get it every time I go out (though much less than the first time), if I haven't been on the water recently. Drugs don't work for me - I hate how 'gummy' they make my head; makes it worse for me. Ginger does help me - Ginger Ale, ginger cookies, etc...
A lot of experienced mates get it a little bit, if they've lost their legs. The best thing is to keep busy on deck or in the wheelhouse. That gets me through it the lightest and quickest. Most don't know I'm feeling it. Plan for a couple discrete hurls and keep your hands and mind working. Stay busy. Driving the boat is the best task - eyes are on the horizon and you're distracted doing something.
Most newbies will be in the rack, which may make them feel better, but it also seems to prolong the misery.
You'll dehydrate at sea, particularly when seasick. Drink a lot of water - until your pee is clear 2X.
I'm not sure how fit you are, but working a fishing boat in a seaway is the most exhausting thing I've ever done. It's not so bad in the calm, but your waters are not known for calm and your skipper is going to fish that boat around the clock in seas that will make you think they're all mad (they are). He will also ask you for help and 30 hours of picking fish on deck might test your fitness. You might get a few times in the gym to wake your body up.
Expect your gear to get destroyed, either by knocks or seawater. I'd call it an expendable cost. The pics will be priceless to you.
Let me know if they have an empty berth, will you?
Good fishing!
- Charlie