1) “mule” family groups tipping their catch into larger buckets and carrying those buckets into the dunes.
2) Young male “runners” (often holding radios or mobile phones)collecting the buckets in the dunes and carrying them along tracks in the dunes.
3) People with radio or mobile phones marshalling vans in the beach car parks. (Clearly these vehicles are not full of holiday makers) The licence plates on these vans will probably give the best way to find the organizers of these rackets.
Please take photos and/or report you observations to 13 FISH (a free call number)