An x-ray image of the large serrated first dorsal fin spine of a leatherjacket. The smaller second spine to the left can lock the first dorsal fin into an erect position.
Copyright © Australian Museum, 2006
An x-ray image of the large serrated first dorsal fin spine of a leatherjacket. The smaller second spine to the left can lock the first dorsal fin into an erect position.
Copyright © Australian Museum, 2006