Biologists use DNA to study migration of threatened whale sharks

giants of the fish world that strike terror only among tiny creatures like the plankton and krill they eat -- are imperiled by over-fishing of the species in parts of its ocean range.

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<p><a href="http://www.physorg.com/news158331934.html">Biologists use DNA to study migration of threatened whale sharks</a></p> <p>giants of the fish world that strike terror only among tiny creatures like the plankton and krill they eat -- are imperiled by over-fishing of the species in parts of its ocean range.</p>