How to spot them: A left-eyed fish that is related to turbot and brill, megrim has a larger mouth than many of the others, and pale yellow or orange skin that turns translucent so that the innards ...

Three species swim in British waters: red; grey, and yellow (also called tub). Until recently, if used gastronomically, it was slipped invisibly into Mediterranean fish stews, stocks or soups.

4. Josh's ultimate fish cooking hack 'There are many species and variables of fish, so my best advice when it comes to a skin on fillet of fish is to cook it only on the skin side,' he said.