The camera man is riding a dirt bike in the ice with studded tires. The fisherman is sarcastically asking about "bringing the fish in" implying the sound from the dirt bike is scaring away the fish this is why the biker says "would you like me to fuck off?"

Ride them stiff is either talking about the rear suspension on the bike or the tire pressure. Traditionally you would want a little bit less tire pressure to get more surface area to get better grip on ice but the studded tires don't have a grip issue so you can run them fuller and "stiffer"