The most surprising part for me about the dried fish trade was the role of Nigeria!
"Enterprising Icelanders have figured out how to salvage the waste from the fish factories. They take the discarded carcasses and heads to hang them on racks to dry and send to Nigeria. There are football fields of hand tied fish heads in the lava fields outside Hafnafjord (near the blue lagoon). Portuguese gave the Nigerians a taste for dried fish heads at and Icelanders are very smart and capitalizing on the protein drain in Africa."
https://olsonfarlow.com/editorial-images/polish-worker-hangi...
"Enterprising Icelanders have figured out how to salvage the waste from the fish factories. They take the discarded carcasses and heads to hang them on racks to dry and send to Nigeria. There are football fields of hand tied fish heads in the lava fields outside Hafnafjord (near the blue lagoon). Portuguese gave the Nigerians a taste for dried fish heads at and Icelanders are very smart and capitalizing on the protein drain in Africa." https://olsonfarlow.com/editorial-images/polish-worker-hangi...
"The heads are primarily sold to Nigeria, where dried fish heads are considered a delicacy." https://icelandmag.is/tags/cod-heads