who is paying for the fuel is an interesting question. when fuel went up 4 years or so ago, then came back down (some) none of the boats lowered their costs- whether or not a 6 pack or party boat, everyone back then blamed the high price increases on fuel. well, fuel is lower. shouldn't the prices have lowered somewhat?
also, if people stop catching fish on a regular basis they wont go at all. so, it's a brutal death spiral - give customers the option for higher fares to travel where the fish are and see how it goes.
i know fuel is more at the docks, but the following chart from the US Govt backs up my points
https://www.eia.gov/dnav/pet/pet_pri_gnd_dcus_nus_a.htm