In November Port Jackson Sharks aggregate in great numbers because it’s their breeding season in South Australia.
Mating is the only time that male and female Port Jackson sharks share ocean space.
They tend to aggregate in large numbers around Port Noarlunga and Christies Beach.
Like other heterodontids, the Port Jackson shark lays auger shaped egg cases.( they lay two eggs every 10 to 14 days, for a total of 8-16 eggs per year. ) PJS’s deposit their egg cases in very shallow water, often less than 5m deep. They have been documented holding their egg cases in their mouths and rotating their bodies to literally screw the eggs into cracks in the reef, The pup to safely develop inside the egg for about 12 months.
About 90% of pups die before reaching sexual maturity at 8-10 years of age.