In the UK the Marine Conservation Society has issued this guideline on mackerel:

We’ve updated the environmental sustainability ratings on our Good Fish Guide in line with the latest scientific advice.

We reviewed 186 environmental ratings for seafood, with 20 seafood ratings moving to the ‘Fish to Avoid’ list and only 15 seafood ratings joining the green-rated, ‘Best Choice’ list with this season’s ratings update. Unfortunately, Northeast Atlantic mackerel has moved on to the amber list, having been on the charity’s green list since before 2011. Continue reading →