Judgment of the Court (Sixth Chamber) of 11 February 2021.#Criminal proceedings against K. M.#Request for a preliminary ruling from Court of Appeal (Ireland).#Reference for a preliminary ruling – Common fisheries policy – Regulation (EC) No 1224/2009 – Control system for ensuring compliance with the rules of the common fisheries policy – Use on board a fishing vessel of equipment which is capable of automatically grading fish by size – Article 89 – Measures to ensure compliance – Article 90 – Criminal sanctions – Principle of proportionality.#Case C-77/20.