Clove oil is an approved method and you can even buy it at the LFS. If it were a big ole salmon, sure chop the head off it. But I wouldn't recommend that to someone who may not know their way around knives and has to aim for the nonexistant neck of an angler. Not everyone even owns a proper style or sharpened knife to get er done right. And quite frankly, not everyone can chop the heads off their pets. We both have backgrounds were animals are food. Not everyone has that exposure.