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137-165. cm inch. The Port Jackson shark ( Heterodontus portusjacksoni) is a nocturnal, oviparous (egg laying) type of bullhead shark of the family Heterodontidae, found in the coastal region of southern Australia, including the waters off Port Jackson. It has a large, blunt head with prominent forehead ridges and dark brown harness-like ...
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The Port Jackson shark ( Heterodontus portusjacksoni) is a nocturnal, [2] oviparous (egg laying) type of bullhead shark of the family Heterodontidae, found in the coastal region of southern Australia, including the waters off Port Jackson. It has a large, blunt head with prominent forehead ridges and dark brown harness-like markings on a ...
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Port Jacksons can pump water through their first gill slit allowing them to remain still on the seafloor for long periods. An unusual feature of the Port Jackson Shark is their spiral shaped eggs. Females can wedge them into cracks and crevices where they are held in place by the corkscrew-like grooves. Listed as least concern by the IUCN.
The Port Jackson Shark can pump water into the first enlarged gill slit and out through the other four gill slits. By pumping water across the gills, the shark does not need to move to 'breathe'. It can lie on the bottom for long periods of time, a behaviour that is observed at breeding time.
