The Marine Conservation Society has downgraded the sustainability ratings for Northeast Atlantic mackerel for the second consecutive year. This year, mackerel caught by midwater trawl, which is widely sold in markets, has dropped from a 3 to a 4 rating. This change means it is no longer recommended for purchase by businesses. Mackerel stocks are declining due to overfishing across several nations. To support marine life, MCS suggests choosing herring or sardines as sustainable alternatives.