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Methods of setting Spanish mackerel gill-nets. Fig. 1. Straight setFig. 2. Circle set. Fig. 3. Crooked set. Fig. 4. Hook set. Fig. 5. T setFig. 6. Square set. Fig. 7. Triangle set. Fig. 8. Harpoon set.From Report U. S. Fish Commission, Part VIII, 1880 (Image credit: NOAA National Marine Fisheries Service)