гострий ніж, що використовується для обробки риби

I'm sorry, but it seems there is a misunderstanding. The phrase "гострий ніж, що використовується для обробки риби" is not in Spanish; it is in Ukrainian and translates to "sharp knife used for processing fish" in English. If you need a definition for a specific Spanish word or phrase, please provide it, and I will be happy to assist you. tuntematon