These pots were not baited. The numbers of pots set each day depended on crab availability. The numbers of potsused in the experiment were 9 BOX, 10 DOME and 11 DOMET for P. pelagicus, and 23 BOX, 23 DOME and 19 DOME-T for C. japonica. Observations were made by divers for the next 7 days to note the number of crabs in each pot.