Seafood sales in US supermarkets are heading in the entirely wrong direction.

The fresh, frozen and shelf-stable categories each posted declines in the number of units sold in May, with fresh seafood sales slipping 22.3 percent, frozen down 14.9 percent and shelf-stable off by 1.5 percent, according to new data released by IRI and analyzed by Texas-based market research firm 210 Analytics.

Dollar sales for fresh and frozen seafood also slipped, despite historic price inflation, indicating that consumers are skipping over seafood for more affordable alternatives.