Is This Really The Worst Day Of The Week To Buy Seafood? - Tasting Table
Briefly

A widely repeated belief warned against ordering fish on Mondays because seafood deliveries did not occur over the weekend, causing product to sit from Thursday through Monday. Many chefs ordered fish on Thursday for Friday delivery to sell over the busy weekend, and unsold portions reappeared as Sunday specials and Monday menu items. Markets and fishmongers often reduced stock after weekend closures, reinforcing the caution. Industry logistics and standards have since changed, with improved sourcing, more frequent deliveries, and higher food-safety practices, making Monday seafood generally as fresh and acceptable as seafood served on other days.
there were no seafood deliveries over the weekend at the time, so most chefs ordered fish on Thursday for a Friday delivery, planning to sell it over the busy weekend. Whatever didn't move on Friday or Saturday would reappear as brunch or specials on Sunday, and by Monday the last of the leftovers were being pushed out before fresh deliveries could be ordered.
Over time, this warning was applied not just to restaurant menus, but even buying fish at the fishmongers and markets itself, since they too were getting rid of stock after being closed for the weekend. But in 2016, he retracted that warning in a video, stating his new position in no uncertain terms: "People, please do me a favor. Order that fish on a Monday."
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