“The whale sharks are a good omen for the fishers because they know when the whale sharks come, that means that lots of small fish or anchovies are around,” says Edy Setyawan, the lead conservation scientist of the Elasmobranch Institute Indonesia. It is the relationship between whale sharks (Rhincodon typus) and fishers in Indonesia that has enabled marine biologists from Konservasi International and Elasmobranch Institute Indonesia to satellite tag more than 70 whale sharks for a decade-long study that has revealed previously unknown migration routes, feeding grounds and a whale shark nursery. It is one of the biggest tracking data sets across the globe on whale sharks and is the first time such a detailed survey has been conducted in the Indo-Pacific. While 60% of the global population of whale sharks can be found in the Indo-Pacific, it can be difficult for researchers to study them because the species travel such long distances. But the researchers experienced a breakthrough when they when found out about the relationship between bagan fishers and whale sharks. A satellite-tagged whale shark. Whale sharks are filter feeders and the world’s largest fish, typically growing to about 12 meters (39 feet), but occasionally reaching 20 meters (66 feet) in length. Image by Abdi-Hasan. Bagan fishers work on floating wooden platforms from which they lower an oversized net into the water to catch fish. Working at night with lights, the fishers attract shoals of ikan bilis (anchovies) into their nets. The whale sharks, which follow the small…This article was originally published on Mongabay

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