Port Jackson Shark

Overview

The Port Jackson shark is a bottom-dwelling bullhead shark easily recognized by its distinctive harness-like dark markings and blunt head profile. It spends daylight hours resting quietly in caves and rocky gullies before becoming active at night. While generally docile and harmless toward humans, it can be encountered by divers across temperate Australian coastal waters.

Appearance

This species features a pale grey-brown body decorated with dark, striking stripes that run across the eyes, down the back, and along the flanks, resembling an old-fashioned horse harness. Prominent ridges run above each eye on its large head. Its jaws contain two distinct tooth types: small, pointed front teeth used for grasping prey, and broad, flat molar-like teeth in the rear.

Biology & behavior

During daylight hours, these sharks exhibit strong shelter-seeking behavior, frequently congregating in rocky crevices, caves, and kelp beds. They are nocturnal hunters and undertake seasonal movements, often migrating to specific shallow breeding grounds during winter. They are oviparous, laying unique dark brown egg cases shaped with spiral flanges that females wedge tightly into rock crevices.

Feeding

The specialized dentition allows the Port Jackson shark to target hard-shelled bottom-dwelling invertebrates. Its diet consists primarily of echinoderms such as sea urchins, along with crabs, molluscs, and small bottom fish, which are crushed and ground using its powerful rear teeth.