![]() Thomson and Murray detail the following instructions for surveying dredged organisms: Illustration of a dredge net aboard the HMS Challenger. ![]() The ship was equipped with 34 dredges and 20 dredge nets, completing 133 dredges at 111 stations during the 4 year long expedition. The expedition, led by oceanographer John Murray and chief scientist Charles Wyville Thomson, set sail in 1872 and returned to England in 1876. Ocean dredging was a common sampling technique used on the Challenger expedition. The practice was chronicled in a remembrance of Forbes by William Jerdan in his 1866 book Men I Have Known. Hopper dredger ship Eke Möbius outside of Cuxhaven, Germany History Edward Forbes Įdward Forbes would lay out the dredged material on the deck to examine, preserve and study it. Ocean dredging techniques were used on the HMS Challenger expeditions as a way to sample marine sediment and organisms. This form of dredging removes substrate and fauna specifically from the marine environment. Ocean dredging was an oceanography technique introduced in the nineteenth century and developed by naturalist Edward Forbes.
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