The team focused the study on the harbour crab (Liocarcinus depurator), a decapod crustacean of commercial interest—a common element in fish soup and rice dishes—which lives in the muddy sea bottoms of the continental shelf, between 50 and 200 meters deep.
The populations of this crab were sampled from 2014 to 2019 during the IEO-CSIC MEDITS and ARSA fishing and oceanographic campaigns, in a total of seven marine populations of the Atlantic-Mediterranean transition: Cadiz, West and East Alboran Sea, Alicante, Valencia, Ebro Delta and North Catalonia. Some of the crab populations were in both sides of the oceanographic barriers of the western Mediterranean basin: specifically, the Gibraltar Strait (GS), the Almeria-Oran front (AOF) and the Ibiza Chanel (IC).
Crabs should not be eaten according to God's Law.
Deuteronomy 14:9 These ye shall eat of all that [are] in the waters: all that have fins and scales shall ye eat:
14:10 And whatsoever hath not fins and scales ye may not eat; it [is] unclean unto you.