Crabbing is catching crabs with either a crab line or a drop net, Crab lines require some skill as the crabs come and take the bait on the line you have to skillfully pull up the line without losing the crab! a drop net is easier as you place the bait inside the net and once a crab has ventured into the net, you pull the net up, crab and all!..
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Set yourself a time limit of say 20 minutes, to see who can catch the most crabs in that time and always keep the crabs in a bucket of sea water in the shade, idealy with some sea weed in for them to hide under. Always immediately return the crabs to the sea where you caught them as soon as you are done.