ULTRA CRAB ESSENCE This extremely strong crab flavour has an aroma that you will never forget. As a notorious fish catching flavour, this pungent essence has proved to be one of the most successful bait flavours ever used and is particularly effective when used with Black Pepper Essential Oil. (See Essential Oils). Whilst there have been many versions of crab flavours over the years, we believe this to be one of the very best examples.