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![Artist's concept of backing down, a maneuver which shifts the weight,causing the back end of a tuna purse seine (net) to sink beneath thesurface allowing porpoise that may be in the net to swim out over the top,while the tuna remain inside fish5610.jpg Artist's concept of backing down, a maneuver which shifts the weight,causing the back end of a tuna purse seine (net) to sink beneath thesurface allowing porpoise that may be in the net to swim out over the top,while the tuna remain inside](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish5610.jpg?itok=Xde9ZRO0)
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Artist's concept of backing down, a maneuver which shifts the weight,causing the back end of a tuna purse seine (net) to sink beneath thesurface allowing porpoise that may be in the net to swim out over the top,while the tuna remain inside. (Image credit: NOAA Central Library Historical Fisheries Collection)