Aiglefin is also known as églefin or haddock (especially if it’s smoked).
However, Capitaine Haddock is always Capitaine Haddock and never Capitaine Aiglefin, although in French instead of ‘Blistering Barnacles!’ he says ‘Mille sabords!’—’A thousand portholes!’
Images by infomatique/William Murphy, Rawpixel Ltd