Scientists from the Zoological Survey of India (ZSI) have discovered a new species of deep-water dogfish shark Squalus hima from Sakthikulangara fishing harbour in Kerala along the Arabian Sea.
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Squalus is a genus of dogfish sharks in the family Squalidae. commonly known as spurdogs, and are characterized by smooth dorsal fin spines.
The discovery has been made by a team of scientists led by Bineesh K. K Scientist at the Marine Biology Regional Centre of ZSI and the discovery has recently been published in the journal Records of the ZSI.
Squalus is a genus of dogfish sharks in the family Squalidae. commonly known as spurdogs, and are characterized by smooth dorsal fin spines. | Photo Credit: Special Arrangement
“This species has been largely misidentified with S. mitsukurii and S. lalannei. However, morphological, meristic, morphometric evidence support it to be a separate and undescribed species. Squalus hima sp.nov differs from other species by the number of precaudal vertebrae, total vertebrae, teeth count, trunk & head heights, fin structure and fin colour,” said by Sweta Beura, lead author of the publication.
In the Indian coast, two species of Squalus are found from the southwest coast of India and the new species, Squalus hima n.sp. very similar to Squalus lalannei, but differs in many characteristics.
The species belonging to Squalus megalops group are characterised by an angular short snout, a small mouth almost as wide as the snout, first dorsal fin origin behind the pectoral fins, and body without any spots.
Dr. Bineesh explained that the shark species belonging to the genus Squalus and Centrophorus are exploited for their liver oil that contains high levels of squalene (or squalane is when it is processed for products). It is in high demand for pharmaceutical industries particularly for making high end cosmetic products and anti cancerous products.
“ Fishermen from the southern coast of India and Andaman and Nicobar Islands are exploiting several such families of sharks to harvest their liver oil for the pharmaceutical industry. The discovery of the new species is important to conserve such varieties of shark,” Dr. Bineesh said,
The scientist added that dogfish sharks represent commercially important taxa because of their trade for their fins, liver oil and meat. Squalus species are also sometimes caught incidentally as bycatch in fisheries targeting other species.
Dhriti Banerjee, director of ZSI, lauded the discovery of a new species of dogfish shark and said that the Survey is conducting deep sea habitat explorations at depths of 1000-3000 metres to find out species diversity of sharks and rays under the special programme of Deep Ocean Mission of Ministry of Earth Sciences.
Dr. Bineesh said that his team has explored sharks and rays in the seas along the country’s coastline to a depth of about 1000 metres and in the next phase the species diversity upto 2000 metres will be explored.
This species Squalus hima is described on the basis of 13 specimens collected from the southwest coast of India during the surveys conducted to understand the diversity and distribution of deep-sea sharks from the Indian EEZ ( Exclusive Economic Zone).
