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![Diagram of backing down process, a maneuver designed to allow porpoise toescape from the tuna purse seine fish5619.jpg Diagram of backing down process, a maneuver designed to allow porpoise toescape from the tuna purse seine](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish5619.jpg?itok=i_VbHt-A)
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https://www.noaa.gov/media/digital-library-photo/pl23fish5619jpgDescription
Diagram of backing down process, a maneuver designed to allow porpoise toescape from the tuna purse seine. (Image credit: NOAA Central Library Historical Fisheries Collection)
Credit
NOAA Central Library Historical Fisheries Collection
Collection
Historic Fisheries