Facts about Japanese Bullhead Shark
- 09
Endemic to the northwestern Pacific, Japanese bullhead sharks are found primarily in the coastal waters of Japan, China, and Korea.
- 08
A member of the family Heterodontidae, the Japanese bullhead shark is one of the most ancient shark lineages, with the heterodontid body plan dating back over 150 million years.
- 07
Egg cases laid by Japanese bullhead sharks are spiral-shaped structures with anchor-like tendrils that attach to rocky crevices on the seafloor for protection during incubation.
- 06
Bullhead sharks in the genus Heterodontus, including Heterodontus japonicus, possess a venomous spine located anterior to each dorsal fin that can cause painful wounds in potential predators or humans handling the species.
- 05
Nocturnal hunting behavior allows Japanese bullhead sharks to feed on benthic invertebrates and small fish during nighttime hours when they emerge from deeper daytime refuges.
- 04
Measuring roughly 60 centimeters in length, Japanese bullhead sharks possess venomous spines on their dorsal fins that deliver toxins to deter predators.
- 03
Female Japanese bullhead sharks are ovoviviparous, gestating eggs internally and producing litters of 4 to 12 live pups per reproductive cycle.
- 02
Heterodontus japonicus inhabits waters around Japan at depths between 80 and 300 meters, preferring the continental shelf ecosystem.
- 01
The Japanese bullhead shark possesses approximately 300 teeth arranged in multiple rows that are continuously replaced throughout its lifetime.