First, you have to lay down your net and bundle up the rope in one hand like an extension cord all the way up to the net. Hold the net in the same hand, and grasp the rim of the net with the other hand. When you want to throw the net, grab the net midway with the rim in the other hand, and throw it towards your target with some spin, so the net lands flat on the water. If the net landed properly, it should sink slowly to the bottom, trapping some fish underneath it. To retract the net, simply jerk the rope a few times and then pull it in.
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