Price per fillet. Available in 170g(6oz) and 230g(8oz) fillets Coley are delivered to our premises on a daily basis and as such freshness and quality are fully retained. Coley has a distinctive coal-coloured skin with a thick white line running laterally along its body; the belly fades to pale silver. Raw fillets have a pink-grey flesh that becomes paler and flaky when cooked. Coley is excellent when eaten very fresh. Itâs also known as saithe or coalfish. It is an excellent, inexpensive fish that can be used for deep-frying in batter or breadcrumbs or poached for use in fish pies. Coley is also excellent in fish casseroles and soups.