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Whale shark near a fishing device called "Bagan". Bagans are large stationary anchored ourigger boats that have a net spanning from outrigger to outrigger. At night these nets are lowered to some 15 m or so and strong electric lights are switched on to attract anchovies and scads. After a few hours the lights are switched off and the nets lifted with the fish trapped inside. The whale sharks are in turn attracted by the unused fish that is discarded in the morning.