HDV Undersea

Would you like to participate in Citizen Science? You can log your photos and video at oceansanctuaries.org/sevengillshark

Part of the mission of Ocean Sanctuaries (oceansanctuaries.org) is to support ocean-related citizen science projects, such as the Sevengill Shark Sightings Org that Bear founded in 2010 to monitor and track Sevengill sharks (Notorynchus cepedianus) in the San Diego area.

We are now identifying individual Sevengill sharks using a pair of pattern recognition algorithms to analyze the freckling patterns on the dorsal sides of these sharks. This involves using photographs taken by local divers who have been trained to recognize this species and obtain high definition photographs from various angles.

Broadnose or spotted sevengill shark - Notorynchus cepedianus (1807)

The genus name Notorynchus is derived from the Greek "noton" meaning back and "rhyngchos" meaning snout. flmnh.ufl.edu/fish/Gallery/Descript/Sevengill/Sevengill.html

These beautiful creatures have recently begun returning to the waters off San Diego, in both the Point Loma and La Jolla kelp beds. They can be dangerous but much of the time they seem to want to know more about us.

I believe our lights interest them. During the day the encounters can be more subdued since they can see us better. At night they must get very close before they dash off.

The other creatures in this video are inhabitants of rocky reefs and kelp beds.

For a full account of the dive refer to:

j vimeo.com/5618253

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