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Whale shark aggregation found in the Red Sea

Whale shark aggregation found in the Red Sea

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A multinational team of researcher utilized three types of satellite transmitting tags to track the movements of 47 whale sharks from 2009 through 2011. The tags, which are placed just below the dorsal fins, measure temperature, depth, and light levels of the waters the fish swim in. After several months, the tags pop off, float to the surface and beam data via the ARGO satellite system back to computers on shore.

Most of the sharks remained in the southern Red Sea throughout the time the tags were on. Some of the tagged individuals headed into the Indian Ocean, which may have been motivated by an abundant food supply related to seasonal upwelling. Whale shark diets vary both seasonally and geographically, but they are thought to feed mainly on zooplankton as well as algae, small fishes, fish eggs, and cephalopods.

Adult whale sharks were not seen at the site, which may serve as a "staging ground" for juveniles before they move on to regional aggregations of larger sharks. To date, 12 whale shark aggregation sites have been identified globally.

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