Wholesale oil and gas prices have surged since the conflict began on 28 February, with the production and transportation of energy across the Middle East slowing or stopping entirely due to missile strikes and drone attacks.
In recent days gas prices have soared further after airstrikes on energy facilities in Qatar and Iran.
Keen says Guernsey’s fishing industry is especially vulnerable to price changes as much of the fish caught needs to be exported.
He said: “It costs the fuel to go out there and get them, and if you want to get good prices you have to take your fish to France or England.
“And if your costs go up 25% in fuel, it makes it very expensive.”
He added that currently 30% of his income from his fishing charter boat currently goes on fuel, and he expects this could rise to about 40% with fuel price increases.
The former vice president of the now defunct Guernsey Fishing Association, Dougal Lane said: “I’ve only got a 10 metre boat but it’s still 250 litres a day and the last price I had was 67p a litre.
“If it goes up to 80p or 90p or whatever, then we’d leave it tied up, it’s not worth going to sea.”