It seems very confusing. Here, it seems, we use the word Pollock and Coley to mean the same fish. Thinking of Coley, whatever happened to that campaign back in 2008 (ish) to get us all eating Coley (or is it Pollock?) rather than Cod, due to over-fishing. Waitrose was campaigning at that time, I remember. Now I rarely see fresh Coley in the supermarkets.
Ok here's how's see it ,I phone my fish monger up ,he tells me what he's got on the board to sell ,pollock sells for me so take 4 fish ,local sustainable easy to sell ,he tells me he has coley ,or hake I always say no thanks it's what I would feed the cat on,but if it gets sold in a generic bundle of lieu noir used for boulabaise etc ,happy days it's a sellable commodity ,
Poetic licence of the French culinary language ,you catch all these types of fish what do you do with them,if no one buys them,it was the same as sardines ,it was small fish caught off Sardinia ,we expect different now,
I remember Hugh's revlution well,and the crispy makeral in the bun,and I do know my local summer fish well ,as we have a rib and fish off the Doset Coast ,summer is the time for pollock,mackerel ,gurnard,garfish ,a few bass ,
you got to use the cheaper fish as well as the bass