![]() This was remarkable for clearly distinguishing the marine fauna of that portion of the French coast into four zones. ![]() The first marine biology dredge was designed by Otto Friedrich Müller and in 1830 the results of two dredging expeditions undertaken by Henri Milne-Edwards and his friend Jean Victoire Audouin during 18 in the neighbourhood of Granville were published. History "Naturalists using the dredge", a plate from William Henry Harvey's The Seaside Book Sanders and the Epibenthic sled designed by Robert Hessler showed that deep-sea bottoms are sometimes rich in soft-bottom benthic species. This led to a mistaken impression that the deep-sea bed lacked species diversity, as theorised by Forbes in his Azoic hypothesis. The dredge digs into the ocean floor and bring the animals to the surface where they are caught in a net that either follows behind or is a part of the digging apparatus.Įarly dredging samplers did not have a closing device, and many organisms were washed out. The dredge is pulled by a boat and operates at any depth on a cable or line, generally with a hydraulic winch. The marine biology dredge is used to sample organisms living on a rocky bottom or burrowing within the smooth muddy floor of the ocean ( benthic) species. A shallow-water dredge from the 1870s Challenger expedition For dredging equipment used in commercial fishing, see Fishing dredge. This article is about scientific dredging equipment.
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