Many other sharks have to swim with their mouths open to force water over the gills. Recent studies suggest Port Jackson shark populations suffer from high embryonic mortality rates, and thus should be monitored closely to insure the populations are not being overfished as bycatch. There are some speculations that Port Jackson sharks could fall prey to larger sharks, such as the white shark or bluntnose sevengill shark. Based on captive studies, the suggested age of male maturity is 8-10 years old. colour with a black triangular harness-like, of bars converging on the sides and back from the start of the first dorsal fin and bases of the pectoral and pelvic fins. There is some evidence that suggests that Port Jackson sharks are seen in groups segregated by gender and level of maturity. Port Jackson Sharks that are new to the aquarium environment can be enticed to eat by feeding them with the aquarium lights dimmed or by offering live saltwater feeder shrimps or fresh meaty marine items like squid or mussels. Port Jackson Sharks are a very attractive species of Horn Shark, that due to its slow swimming, slow growth and ability to acclimate well to aquarium life, have made them a mainstay within the aquarium hobby. Coloration The PJ has five gill slits and it is able to do a pretty nifty thing with its gills: it can pump water into its first enlarged gill slit and out through the other four. The season is the Australian winter (July to August). They usually return to the same area every winter to breed. Captive studies have suggested that the age of female maturity is between 11 and 14 years old. While Port Jacksons can tolerate a range of temperatures between 58°F to 79°F, they prefer water temperatures between 60°F - 72°F. Click or tap the images below to view full size images, then click or tap off the image to shrink again. PJs feed at night, and if you do a night dive you may see these usually docile sharks become very active. The egg capsules are distinguishable by their double-helix, cone-like structure. Common problems to watch out for when diving with PJs is to make sure a startled PJ doesn't run into you! Keeping heaters, skimmers, circulation pumps and other equipment in a sump will help to eliminate electrical currents in the display tank. Numerous parasites have been reported both on and within Port Jackson sharks. Port Jackson sharks are oviparous, meaning they lay egg capsules instead of giving live birth, and have an annual reproductive cycle. However,Heterodontus portusjacksoni is the valid name used today. The Port Jackson shark breeding season lasts from late August to mid November, during which time a female will lay a pair of eggs every 10-14 days. The Port Jackson shark's name, "Heterodontus portusjacksoni", means "different teeth" and this is exactly what the PJ has, The PJ's front teeth are small and pointed, while the back teeth are broad and flat. Remember that the PJs are probably scared of divers so try not to harass them too much on your next dive. Like most shark species available within the aquarium hobby the Port Jackson Shark can be housed in aquariums as small as 100 gallons while a juvenile, but must be moved to larger aquariums as it matures and increases in size. The PJ has a blunt snout and is usually a browny colour with a black triangular harness-like set of bars converging on the sides and back from the start of the first dorsal fin and bases of the pectoral and pelvic fins. ... Steve, on the other hand, despite also be plagued by blowies, managed to land a Port Jackson Shark. Integrated Scuba Systems. Males become sexually mature at 8-10 years of age and females at 11-14 years of age. They also have a black strip which runs through to the eyes. In fact Port Jackson Sharks kept in temperatures about 75°F have been known to grow upwards of twice as fast as specimens kept in water conditions closer to 60°F. Thus if an individual is disturbed at one site it can quickly find another acceptable site within the region. The IUCN is a global union of states, governmental agencies, and non-governmental organizations in a partnership that assesses the conservation status of species. caves). They need to be 8 to 10 years to be that mature. There are some reports indicating adult male Port Jackson sharks prey upon Port Jackson shark egg capsules, however some speculate that those reports were cases of mistaken identity since crested horn sharks (Heterodontus galeatus) have been seen preying upon Port Jackson shark egg capsules on several occasions. During the mating season, August – November, Port Jackson sharks are seen laying their eggs close to shore, and thus more neonates are seen in the shallows come hatching season. Scientists have noted that a female can lay up to 16 eggs during each breeding season.

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