Folks fish on Lake Ontario using big engines to power their boats out to deep water when the thermocline sets up then putt around between 2-3 mph for hours using the big motor or else a small kicker motor. Fuel costs are a big part of how much profit charter captains remains. Have yet to see many electric motors for the big lake fishing boats but their time will come. Honda and others are filing patents on hybrid engines.Related to the idea of moving based on EV technology but on water, not roads . . .
Bass fishing uses electric batteries for quietly sneaking into fishing spots after running the big motor to where the fish are.
An electric motor is much more stealth and should be cost effective. The exhaust from the hydrocarbon engines goes into the H2O.