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|Topic Started: Aug 31 2013, 03:16 PM (548 Views)|
|Taipan||Aug 31 2013, 03:16 PM Post #1|
Species: Hemiscyllium halmahera
Hemiscyllium halmahera is a species of bamboo shark from Indonesia. This species is described from two specimens collected near Ternate island in 2013, off the coast of larger Halmahera island. This species is most similar to Hemiscyllium galei, found in West Papua, but looks strikingly different in its pattern of spots. While H. galei has seven large, dark spots on each side of its body, H. halmahera has a brown color with clusters of spots in polygon configurations all over its body. Perhaps most interestingly, these small sharks are like other bamboo sharks, in that they use their pectoral fins to "walk" along the ocean floor.
New 'Walking' Shark Species Caught on Video
By Douglas Main, Staff Writer | August 30, 2013 12:11pm ET
A new species of "walking" shark has been discovered in a reef off a remote Indonesian island.
These sharks don't always rely on "walking" to move about — often, they only appear to touch the seafloor as they swim using their pectoral and dorsal fins in a walklike gait, said Fahmi (who only goes by one name), a shark researcher at the Indonesian Institute of Science who wasn't involved in the study describing the species. In the video of the newfound walking shark, however, the animal is clearly touching the seafloor.
The shark grows up to 27 inches (70 centimeters) long and is harmless to humans, said Mark Erdmann, a marine biologist and adviser with Conservation International who was also a co-author on the study describing the species. The animal has been dubbed Hemiscyllium halmahera, named after the eastern Indonesian island of Halmahera where it was found. Sharks in its genus (the taxonomic group above species) are also known as epaulette sharks, since many sport markings that resemble military epaulettes, according to a Conservation International statement.
Of all known epaulette or walking sharks, six of nine species hail from Indonesia, Fahmi told LiveScience. The animals lay eggs under coral ledges, after which the young sharks lead relatively sedentary lives until adulthood, according to the statement. These sharks do not cross areas of deep water and are found in isolated reefs throughout Indonesian and western Pacific waters, the statement noted.
Coincident with the discovery of the new species, Indonesia has announced various initiatives to protect sharks. In the last six months, for example, two of the country's biggest tourist destinations, the island groups of Raja Ampat and West Manggarai, have outlawed shark and ray fishing in their waters, according to the statement. The Ministry of Marine Affairs and Fisheries is also drafting legislation to protect endangered sharks and rays, said Agus Dermawan, director of the Ministry's Marine Conservation Directorate, in the release.
Part of the reason for the shift toward conservation is that sharks are important for tourism; sharks are generally worth more alive in the ocean than they are worth dead, Dermawan said. "We now know, for instance, that a living manta ray is worth up to US $1.9 million to our economy over the course of its lifetime, compared to a value of only $40 to $200 for its meat and gill-rakers," which are used in traditional medicines, Dermawan said.
A study describing the new walking shark species was published in July in the Journal of Ichthyology.
Gerald R. Allen, Mark V. Erdmann and Christine L. Dudgeon: Hemiscyllium halmahera, a new species of Bamboo Shark (Hemiscylliidae) from Indonesia, aqua International Journal 19(3),Volume 19, Issue 3 - 19 July 2013, pp. 123-136.
Hemiscyllium halmahera new species is described from two specimens, 656-681 mm TL, collected at Ternate, Halmahera, Indonesia. The new species is clearly differentiated on the basis of colour pattern. Its features include a general brown colouration with numerous clusters of mainly 2-3 dark polygonal spots, widely scattered white spots in the matrix between dark clusters, relatively few (< 10), large dark spots on the interorbital/snout region, a pair of large dark marks on the ventral surface of the head, and a fragmented post-cephalic mark consisting of a large U-shaped dark spot with a more or less continuous white margin on the lower half, followed by a vertical row of three, smaller clusters of 2-3 polygonal dark marks. The new species is most similar in general appearance to H. galei from Cenderawasih Bay, West Papua, which differs in having 7-8 large, horizontally elongate dark spots on the lower side between the abdomen and caudal-fin base, a cluster of solid dark post-cephalic spots, and usually about 25 dark spots on the upper surface of the head.
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