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![A harrow adapted for underwater use to cover oyster drills and other enemiesof commercial mollusks with a layer of bottom deposit fizh0299.jpg A harrow adapted for underwater use to cover oyster drills and other enemiesof commercial mollusks with a layer of bottom deposit](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fizh0299.jpg?itok=eM_51JMq)
Description
A harrow adapted for underwater use to cover oyster drills and other enemiesof commercial mollusks with a layer of bottom deposit. This method ofmechanical control of drills is being widely tested in Long Island Sound.Outside of establishment of Mansfield and Sons. (Image credit: NOAA Central Library Historical Fisheries Collection)