@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . skos:narrower . skos:member . skos:related . skos:related . skos:altLabel "Natlst dredge" , "Natlst dredge"@en ; skos:broader , , ; skos:definition "An instrument designed for the collection of benthic organisms and bottom material on a variety of grounds. It consists of a rectangular dredge frame, two dredge arms and a triangular mesh net, usually about half as deep as it is wide. The dredge frame varies in length, depending on the size of the towing vessel: 300-380 mm for small boats; 450-600 mm for larger boats; and 750-1300 mm for trawlers. Typically, one dredge arm is attached directly to the tow rope, while the other is attached by a weak link, such as twine, to release the dredge should it become stuck on the seabed. The collection net may be lined with an inner bag of non-impervious material for the collection of sediment."@en ; skos:inScheme ; skos:notation "SDN:L22::NETT0190" ; skos:note "accepted"@en ; skos:prefLabel "Unspecified naturalists {rectangular} dredge"@en ; skos:related , . skos:narrower . skos:related . skos:narrower . skos:narrower . skos:narrower . skos:narrower . skos:related .