{"title":"Dredges","description":"\u003cp\u003eA dredge is lowered on a line to grab a sample of bottom sediment. The AMS \u003ca href=\"\/en-us\/products\/ekman-dredge-spring-loaded\"\u003eEkman dredge\u003c\/a\u003e is all stainless steel and spring-loaded: a messenger sent down the rope trips the jaws, and it ships with 100 ft of nylon rope. The \u003ca href=\"\/en-us\/products\/15-lbs-25-lbs-bottom-dredge\"\u003e15 and 25 lb bottom dredges\u003c\/a\u003e take a 6 x 6 in. sample and use their weight to penetrate firmer bottoms, and the \u003ca href=\"\/en-us\/products\/sand-silt-dredge\"\u003esand\/silt dredge\u003c\/a\u003e, made entirely of 300-series stainless steel with a 6 x 7-1\/2 in. jaw opening, is built for coarser material.\u003c\/p\u003e\u003cp\u003eFor core samplers, sludge samplers and the Snapper grab, see \u003ca href=\"\/en-us\/collections\/sludge-sediment-sampling\"\u003esludge and sediment sampling\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eSediment dredge FAQ\u003c\/h2\u003e\u003ch3\u003eEkman dredge or bottom dredge?\u003c\/h3\u003e\u003cp\u003eThe Ekman dredge is built for soft mud, silt and organic ooze in calm water; it loses sample in flowing water and on coarse or rocky bottoms. On sand, compacted silt or heavier material, use the 15 or 25 lb bottom dredge or the sand\/silt dredge. See \u003ca href=\"\/en-us\/blogs\/field-notes\/ekman-dredge-vs-snapper-vs-swing-sampler-a-sediment-grab-sampler-guide-for-canada\"\u003eEkman dredge vs Snapper vs Swing Sampler\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eHow do I use an Ekman dredge?\u003c\/h3\u003e\u003cp\u003eLower it open, at a steady pace, so the hinged top doors let water through and the dredge does not push a pressure wave into the surface sediment; then send the messenger down the line to close the jaws and raise the dredge.\u003c\/p\u003e\u003ch3\u003eGrab sample or core?\u003c\/h3\u003e\u003cp\u003eA dredge collects the surface layer of the bottom in one drop, which suits surface sediment surveys. To see and sample the layers at depth, use a core sampler such as the AMS multi-stage sludge\/sediment kit.\u003c\/p\u003e","products":[{"product_id":"sand-silt-dredge","title":"Sand \/ Silt Dredge","description":"\u003cdiv class=\"shortDesc\" data-mce-fragment=\"1\"\u003eEasily Sample Most Types of Bottom Surfaces\u003c\/div\u003e","brand":"AMS","offers":[{"title":"5 lbs SST Dredge","offer_id":39899811381441,"sku":"AM-445.70","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"1\/4\" Nylon Rope, Sold\/Foot, 0.02 lbs","offer_id":39899811414209,"sku":"AM-445.00","price":0.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/7434\/6433\/files\/445.70__34107.1664912264.png?v=1781103429"},{"product_id":"15-lbs-25-lbs-bottom-dredge","title":"15 lbs \u0026 25 lbs Bottom Dredge","description":"\u003cdiv class=\"shortDesc\" data-mce-fragment=\"1\"\u003eEasily Sample Most Types of Bottom Surfaces\u003c\/div\u003e","brand":"AMS","offers":[{"title":"15 lbs SST Dredge","offer_id":39899819704513,"sku":"AM-445.10","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"25 lbs SST Dredge","offer_id":39899819737281,"sku":"AM-445.60","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"1\/4\" Nylon Rope, Sold\/Foot, 0.02 lbs","offer_id":39899819770049,"sku":"AM-445.00","price":0.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/7434\/6433\/files\/445.10__60900.1664913530.png?v=1781103431"},{"product_id":"ekman-dredge-spring-loaded","title":"Ekman Dredge Spring-Loaded","description":"\u003cdiv class=\"shortDesc\" data-mce-fragment=\"1\"\u003eAll stainless steel Ekman Dredge is springloaded with a messenger that travels down the rope and trips the dredge to close. Includes Ekman Dredge, messenger, 100 ft nylon rope and carrying case. \u003c\/div\u003e","brand":"AMS","offers":[{"title":"Ekman Dredge, 6.70 lbs","offer_id":39899828060353,"sku":"AM-445.11","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"Ekman Messenger, 0.68 lbs","offer_id":39899828093121,"sku":"AM-445.12","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"Ekman Dredge Cable Kit, 0.15 lbs","offer_id":39899828125889,"sku":"AM-445.13","price":0.0,"currency_code":"CAD","in_stock":true},{"title":"Ekman Optional 5' Handle, 2.70 lbs","offer_id":39899828158657,"sku":"AM-53864","price":0.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/7434\/6433\/files\/445.11__35174.1664912591.png?v=1781103433"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/7434\/6433\/collections\/ams_bottom_dredge_lg.jpg?v=1632509887","url":"https:\/\/www.ereinc.com\/en-us\/collections\/dredges.oembed","provider":"ERE Inc.","version":"1.0","type":"link"}