Hundreds of live crustaceans overcrowded in Cardiff supermarket

Hundreds of crustaceans for sale in Cardiff supermarket. Observer "Six tanks, two for each species. Two types of crab and lobsters - I don't know enough about crustaceans to tell what species. Around 30 lobsters, 40 of crab 1, and it was hard to tell but surely 50+ of crab 2. They all appeared to be alive but they moved very infrequently so it was slightly hard to tell. The lobsters and one of the two crab types had very little room but were at least separate. But the other species of crab had so many there wasn't enough floor on the tank and they were stacked on top of each other in places."