Sea Stewards is partnering with local fishermen of Team Fishfinders and the California Academy of Sciences in a long term San Francisco Bay shark study. Continuing with tagging work started in 2008 with the San Francisco Aquarium of the Bay, our team is marking and recapturing sevengill sharks (Notorhynchus cepediana) in the San Francisco Bay to determine growth, movements and population demographics of these enigmatic sharks.

We are placing conventional “dart” or Floy tags on the dorsal surface of the sharks. The red tags are impanted on seven gill sharks.  Yellow tags are implanted on Leopard sharks and other species of smaller sharks in the Musetelid (smoothhound) family.  In our new study, we are examining Leopard Sharks (Triakis semifaciatus) in five locations of the bay to determine demographics, growth, site fidelity and population genetics.

Tags are uniquely numbered and labeled with the Monterey Bay Aquarium or the California Academy of Sciences return address, phone number, and website.  Information such as length, location and gender will be collected at the time that the tag is placed on the shark and again when independent anglers return information on sharks they have caught.

Fishermen are encouraged to release sharks.  IIf landing a tagged shark, please provide the following information to the phone number or e-mail address link below:

  • Identification number on tag.
  • Date and time of capture.
  • GPS Location (or specific location as posible).
  • Length including Pre Caudal (measure from the tip of the snout to the base of where the tail meets the body)    Total Length (from the tip of the snout to the tip of the upper lobe of the tail fin).

Information collected from tagged sharks will also contribute to other research efforts in collaboration with Aquarium of the Bay, the Marine Science Institute in Redwood City, CA.

REWARD FOR INFORMATION   The California Aacdemy of Sciences or the Monterey Bay Aquarium will provide 2 free aquarium tickets for any information returned on sharks that are caught with our tags.  Contact David McGuire at 415-350- 3790 with any information on these or other tags found. If other tags, we will share the information with that institution and provide reward information.

E-mail SeaStewards or call 415-350-3790.