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This photograph of Port Jackson sharks mating was taken on 3rd October 2019 at a depth of about 20 metres by the Oakland wreck which lies just outside of the Port Stephens heads, NSW Australia.

I used my Nikon D500 digital SLR with a Sigma 17-70mm lens at 17mm and two Inon Z-330 strobes on low manual settings. ISO 320, 1/250th sec, aperture F7.1, Exposure Compensation 0.