The aim of the invention is to establish a colony of and harvest vagilebenthic animals, inparticular crabs, including on structured and inaccessible beds of bodies ofwater. To thatend, the device (01) according to the invention has either side of a centralhinge (06) twoauxiliary hinges (11) by means of which frames (03) can be positioned atdifferentopening angles (.THETA.) of the device (01) such that it can also be adaptedto structured bedsof bodies of water (02). The device (01) is hoisted and lowered in thecollapsed or foldedform, and is laid out in the folded or fully open form. Tubular components(15) improvedrift and are particularly attractive as a habitat for crabs. The device (01)according to theinvention can thus be used as an artificial reef to establish a colony and asa trap foreffectively harvesting crabs in the immediate surroundings of wind turbines inoffshoreareas.
