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Scientists discover the largest assembly of whale sharks ever recorded
Date:5/25/2011

I>), a member of the mackerel family.

"Having DNA barcoding is an incredibly valuable resource for this research," said Lee Weigt, head of the Laboratories of Analytical Biology at the Smithsonian's National Museum of Natural History. "It not only allowed us to know what exactly this huge aggregation of whale sharks were feeding on, not readily done from only physical observations of eggs, but it also revealed a previously unknown spawning ground for little tunny."

The team of scientists also examined a nearby, less dense aggregation of whale sharks, known as the Cabo Catoche aggregation, off the northern tip of the Yucatn Peninsula. They found that the prey of this group mostly consisted of copepods (small crustaceans) and shrimp. Increased sightings at Afuera coincided with decreased sightings at Cabo Catoche, and both groups had the same sex ratio, implying that the same animals were involved in both aggregations.

"With two significant whale shark aggregation areas and at the very least one active spawning ground for little tunny, the northeastern Yucatn marine region is a critical habitat that deserves more concerted conservation effort," said Maslanka.

The whale shark is listed as "vulnerable" with the International Union for Conservation of Nature and Natural Resources. Populations appear to have been depleted by harpoon fisheries in Southeast Asia and perhaps incidental capture in other fisheries.


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Contact: John Gibbons
gibbonsjp@si.edu
202-633-5187
Smithsonian
Source:Eurekalert  

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