As has already been pointed out, it's likely due to cost.
Supply is down relative to demand, especially foreign demand. Soft shell clams have been surpassing all time high prices every summer for a few years, mostly due to Japanese and Chinese demand.
Then there’s bait, rigging, gear, diesel, etc. which all cost more. Obviously that gets passed onto the consumer.
As if all that wasn’t enough, asinine quotas have been either established or slashed to practically nothing in many fisheries, further reducing supply. For example, there are less than a handful of menhaden boats operating in Maine, where there used to be dozens. They regulatory agencies established quotas to a point where they can’t turn a profit.
Mostly arbitrary State and Federal regulations based on feels and junk science has made everything more expensive in my AO. It really pisses me of the more I think about it.