Just did some digging around. Apparently…
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One of the most comprehensive surveys of U.S. diet from 2007-2016, the National Health and Nutrition Examination Survey, researchers finally have accurate numbers on seafood consumption in the United States (pre-pandemic). They found that by weight, 63% of seafood is consumed at home, with the majority coming from retail and a smaller proportion from takeout.
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The demand for sea-food was always there even during the Pandemic
Fresh and frozen seafood sales continue surging in the United States, as Americans continue to eat more meals at home during the COVID-19 pandemic. And, as a result of increasing demand for grocery purchases, supermarkets and grocery delivery services continue to expand. Overall fresh seafood sales jumped 41.6 percent for the week of 12 July, according to Information Resources Inc., while frozen seafood sales climbed 41.9 percent.
Sources: https://sustainablefisheries-uw.org/seafood-consumption-statistics/
https://www.seafoodnews.com/Story/1175473/Seafood-Fastest-Growing-Supermarket-Category-During-Last-Week-of-May
https://www.seafoodsource.com/news/premium/foodservice-retail/retailers-expand-as-seafood-sales-continue-booming
The demand for sea-food may have also been driven due to
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Meat plants being shut down https://www.theday.com/article/20200621/BIZ02/200629901
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Scarce supply of fresh-water fish
https://www.foxbusiness.com/industrials/frozen-fare-fishing-industry-coronavirus