Австралийский призрачный акулий скат: геном и эволюция хрящевых рыб.

Species of cartilaginous fish

The Australian ghostshark (Callorhinchus milii) is a cartilaginous fish (Chondrichthyes) belonging to the subclass Holocephali (chimaera). Sharks, rays and skates are the other members of the cartilaginous fish group and are grouped under the subclass Elasmobranchii. Alternative names include elephant shark, makorepe (in Māori), whitefish, plough nose chimaera, or elephant fish. It is found off southern Australia, including Tasmania, and south of East Cape and Kaipara Harbour in New Zealand, at depths of Despite several of its names, it is not a shark, but a member of a closely related group.

The fish is silvery in colour with iridescent reflections and dark, variable markings on the sides. It has an elongated body, which is smooth and torpedo shaped, with two widely separated, triangular dorsal fins. They use their hoe shaped snouts to probe the ocean bottom for invertebrates and small fishes.

At present this species is considered native to the waters of southern Australia and New Zealand. In New Zealand, Australian ghostsharks are exploited commercially, particularly during spring and summer when they migrate into shallow coastal waters. In Australia, they are caught by southern shark gillnet fishery, particularly in Bass Strait and south east Tasmania, though this fishery targets the gummy shark, Mustelus antarcticus, and will sometimes discard ghostsharks due to the considerably lower price they fetch at market. They are also a popular target of recreational fishers in Westernport Bay, Victoria and in the inshore waters of south east Tasmania. Their white flesh fillets are very popular with fish and chips restaurants in New Zealand and is sold as 'flake' or 'whitefish' in Australia.

In January 2014, Nature reported research into the Australian ghostshark genome that showed they lack a single gene family that regulates the process of turning cartilage into bone, and indicates a gene duplication event gave rise to the transformation in bony vertebrates. The Australian ghostshark was proposed as a model cartilaginous fish genome because of its relatively small genome size. Its genome is estimated to be 910 megabases long, which is the smallest among all the cartilaginous fishes and one third the size of the human genome (3000 Mb). Because cartilaginous fishes are the oldest living group of jawed vertebrates, the Australian ghostshark genome will serve as a useful reference genome for understanding the origin and evolution of vertebrate genomes including humans, which shared a common ancestor with the Australian ghostshark about 450 million years ago. Studies so far have shown the sequence and the gene order (synteny) are more similar between human and elephant shark genomes than between human and teleost fish genomes (pufferfish and zebrafish), though humans are more closely related to teleost fishes than to the Australian ghostshark. The Elephant Shark Genome Project was launched with the aim to sequence the whole genome of the elephant shark.

The New Zealand Department of Conservation has classified the Australian ghost shark as "Not Threatened" with the qualifier "Conservation Dependent, Increasing" under the New Zealand Threat Classification System.