Why is the Port Jackson shark egg case spiral?
When it hatches, the young Port Jackson shark will be between 18 to 22cm in length and is a miniature adult. The spiral nature of this egg case means that it is probably the best-known shark egg found on our beaches but there are others. All sharks produce eggs, it is where they develop that differs.
Where do Port Jackson sharks live?
Australia
The Port Jackson shark is a nocturnal, bottom dwelling shark that is found in the temperate waters off of the southern half of Australia. Port Jackson sharks are found both close to shore and off the shelf in waters as deep as 902 feet (275 m).
Is a Port Jackson shark a shark?
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.
Can we eat Port Jackson shark?
There is no commercial interest in Port Jackson sharks as their meat and fins are considered to be poor quality. Most are discarded, often alive, while some people consider them a pest and kill them before tossing them.
Are Port Jackson sharks edible?
Do Port Jackson sharks have teeth?
Port Jackson Sharks are considered harmless to humans, although the teeth, whilst not large or sharp, can give a painful bite. The shark has two similar-sized dorsal fins. Each fin has a spine at the leading edge, which is reputed to be venomous.
What sharks lay spiral eggs?
Spiral shark eggs Bullhead sharks produce spiral- or corkscrew-shaped eggs. Emma Bernard, a fossil fish expert at the Museum, explains the reasons behind the unusual shape.
CAN U EAT Port Jackson shark?
Can I own a shark?
It is legal to own sharks, which can cost anywhere from a few hundred to thousands of dollars, according to Mr. Raymer. Some species, like great whites, are protected, and cannot be kept in homes. “The shark is the most feared animal in the waters.