Sevengill Shark Sightings on the Rise in Southern California

sevengill_scottmcgee.jpg
The majestic broadnose sevengill shark. Photo by Scott McGee - underpressurephoto.com

Active REEF surveyor, Mike Bear, and other San Diego area divers started noticing something unexpected earlier this year -- increasing numbers of encounters with the Bluntnose Sevengill Shark, Notorynchus cepedianus, also known as the Broadnose Sevengill shark. Knowing first hand the impact that divers and snorkelers can have as citizen scientists, Mike set up a website - http://sevengillsharksightings.org -- to serve as a central repository for photographic, videographic and written data on these magnificent creatures. Submissions on the site will allow REEF surveyors who are lucky enough to encounter this prehistoric species to provide additional information and images beyond the sighting and abundance information recorded as part of their REEF survey. It will also enable divers who were not doing a REEF survey to report their encounter. One of the most interesting parts of the website will be the development of an informal photographic database of Sevengill sightings that will facilitate the comparison of photographs and the potential identification of individual sharks using the unique pattern of dark "freckles" on the backs of each shark, similar to the patterns seen on whale sharks. To date, six REEF surveys in San Diego have reported a Sevengill (click here to see the sightings report).

Second Annual Bahamas Lionfish Derby Brings in 941 Lionfish

abacolargestlionfish2010.jpg
Zane Carney, from Team Meander, captured the largest lionfish of the day - a whopping 43.4cm in length (approx. 19 in) and weighing about 4 pounds!
derby10_cleaning.jpg
Preparing the lionfish for the cookout.
derby10_firstplace.jpg
Derby First Place Team, White Roach.

The second annual Abaco Lionfish Derby, held at Green Turtle Cay, Bahamas, on Saturday June 19th, was a huge success. Teams on twenty-one boats from Florida and the Bahamas enjoyed perfect weather and conditions while collecting a grand total of 941 lionfish. Over $5,000 in cash was awarded to the winning teams for the most, biggest, and smallest lionfish. This event, held in the Bahamas and sanctioned by the Bahamas Department of Marine Resources, is one of many REEF efforts to cull invasive lionfish populations and raise awareness about the issue.

The award for most lionfish collected in the one-day event went to team White Roach from Abaco. Repeat winners, the trio of skilled lionfish collectors significantly exceeded their tally from 289 lionfish last year to a whopping 345 this year. This number is both astonishing and alarming when you consider how dense lionfish populations must be for three people to have the ability to collect over 300 lionfish in the span of a single day.

Team Meander from Jacksonville, FL, clenched 1st, 2nd, and 3rd place for largest lionfish collected. Zane Carney captured the largest lionfish ever recorded in the Abacos, which measured just 2cm short of the national record. Zane told Derby organizers that he found a hole outside the main barrier reef off of No Name Cay in 45 feet of water that was full of very large lionfish. He used a pole spear to bag the winning fish, which was 43.4 cm in length (roughly 19 inches long) and weighed approximately 4 pounds.

Lad Akins, REEF’s Director of Operations, and Stephanie Green, a collaborative research partner from Simon Fraser University, recorded valuable data during the event, including lionfish sizes, stomach contents, and sex for many of the lionfish before they were filleted and cooked by the Green Turtle Club. Observers and participants, many of whom had never tried lionfish, found the fish quite tasty, resembling hogfish or grouper. This year, Tropic Seafood Limited of Nassau also arranged to purchase some of the larger fillets of lionfish for distribution in local markets. According to Derby organizer, Bobbie Lindsay, “Tropic’s offer to purchase lionfish is an exciting development, because creating a market for lionfish is the best way to control the population of this invasive fish.”

Thanks to the Derby co-sponsors, Green Turtle Club, and Brendal’s Dive Center, who offered special discounts for Derby participants. REEF also extends sincere gratitude to all of the participants, and especially Bobbie Lindsay, an active REEF member and volunteer who took the lead in organizing the Derby making it a successful event again this year. Next year’s Derby is set for June 24-25, 2011. For full results and pictures go to www.lionfishderby.com.

Summary of Team Results -

  • Most Lionfish: 1st Place: White Roach 2nd Place: Goofin’ Off 3rd Place: Cajun Bahamas
  • Largest Lionfish: 1st, 2nd, and 3rd Place: Meander
  • Smallest Lionfish: 1st and 2nd Place: Goofin’ Off 3rd Place: All Play
  • Top of the Charts: Survey Stats

    arrowblenny_dougchampion_sm.jpg
    An arrow blenny is a great find during a Caribbean survey. Photo by Doug Champion.

    Current Most Active Surveyors

    Conducted the most surveys in the last three months:

    TWA – Peter Leahy (169), Michael Phelan (67), Dave Grenda (48)

    NE – Jason Feick (9), John Feehan (8), Michael MacDonald (7)

    PAC – Rhoda Green (36), Jan Kocian (34), Betty Bastai (31)

    TEP – Carol Cline (16), Daniel Richards (12), Gerald Winkel (3)

    HAW – Don Judy (41), Rick Long (34), Flo Bahr (23)

    To date, 140,234 surveys have been conducted by REEF volunteers.

    Visit www.REEF.org/db/stats to see the Top 10 surveyors with the most surveys conducted to date, the most species-rich locations, and most frequently sighted fish species.

    Putting It to Work: REEF Scientist Participates in Key Workshop

    presentingposter.jpg

    In addition to maintaining the REEF Survey database and providing data files to scientists, government agencies, and other groups, REEF staff participate in a variety of scientific conferences and workshops each year. Earlier this month, REEF's Director of Science, Dr. Christy Pattengill-Semmens, participated in "Engaging and Learning for Conservation". Christy and 49 others were invited to the workshop to discuss ways to enhance biodiversity conservation and environmental stewardship through public participation in scientific research (PPSR). PPSR encompasses citizen science and other programs where the public is involved in one or more phases of scientific research. With support from the National Science Foundation, the Cornell Laboratory of Ornithology, a leader in bird citizen science programs, initiated this effort to bring together conservation scientists and practitioners, resource managers, academics, educators, and community and project leaders. The overarching goal of the workshop was to discuss best practices to build the field of public participation in scientific research, and lay the groundwork for the workshop team to refine ideas into tools and resources. The two-day workshop was held at an epicenter of biodiversity and conservation research, the American Museum of Natural History in New York City. With almost 20 years of working with REEF, Christy had valuable perspectives on how a citizen science program can meaningfully contribute to conservation and stewardship.

    Putting It To Work: REEF Advanced Assessment Team Member Co-Authors Publication on Barracuda

    YOYbarracudaYOYtomtate_auster.jpg
    A large school of young Barracuda. Photo by Peter Auster.

    REEF Advanced Assessment Team Member, Dave Grenda, recently co-authored a paper documenting behavioral observations of young Great Barracuda occurring on live bottom sub-tropical reefs primarily at Gray's Reef National Marine Sanctuary off the coast of Georgia. For the past three years Dave assisted University of Connecticut researcher, Dr. Peter Auster, in studying behavioral interactions of piscivores and their prey. During REEF surveys on these cruises, Dave and the other researchers documented young-of-year (YOY) Great Barracuda (those individuals that had very recently settled to the reef, and were between 2-3 inches in length) hunting YOY Tomtate and Silverside that were taking refuge under ledges. Groups of YOY Barracuda would attack, capture, and consume the prey. Prey that escaped the Barracuda retreated to reef edges and were often consumed by bottom-dwelling adult piscivores such as Black Sea Bass, Bank Sea Bass, and Scamp Grouper. These findings indicate that given the strong functional role the young Barracuda have on driving species interactions, greater attention should be given to the roles played by the wider diversity of YOY piscivores recruiting to reef communities. The paper was recently published in the scientific journal Southeastern Naturalist. You can find a link to this and all published papers that have included REEF data on our Publications page. 

    Rogest Designs New REEF Flag T-Shirt

    dottyreef_small.jpg

    A great way to wear REEF! Famoust marine life artist, Rogest, took his famous dotty style to the REEF logo. The dotty REEF Flag is on the front and "Diving that Counts" is proudly displayed on the back. Available in two colors - Charcoal Gray and Indigo Blue. Head over to the REEF Store today and get yours. We have also added several new Pacific marine life ID books and new waterproof ID cards. Go check them out! www.REEF.org/store

    REEF Announces New Board Members

    REEF Board of Trustees (l-r): Alex Alexiou, Paul Humann, Andy Dehart, Ned DeLoach, Anna DeLoach, Bob Ramin, Jim Dalle Pazze, and Peter Hughes.

    For more than 20 years, REEF has been conserving marine ecosystems through education, service, and research. It’s an exciting time for REEF as we work hard to extend the reach of our innovative marine conservation programs. One way REEF is doing this is by inviting diverse leaders to the Board of Trustees to help guide the foundation, including these three new members:

    Peter A. Hughes is the Founder of the DivEncounters Alliance, a group of independent live-aboard dive operators. Peter is one of the diving world’s foremost live-aboard operators, having spent more than forty years in the dive industry and over the past 25 years, building his former live-aboard company, Peter Hughes Diving, Inc.

    Alexander Alexiou, is a successful Broker for Island Real Estate based in Harbour Island, Bahamas. He has traveled extensively and brings unique insight into the culture and ecology of islands throughout the tropical western Atlantic.

    Robert Ramin, formerly the Executive Director of the National Aquarium in Washington, DC, is now the Chief Executive Officer of the Washington Animal Rescue League. He has extensive fundraising and membership development experience and has been a leader at the Association of Zoos and Aquariums Management Schools for the past 16 years.

    Peter, Alex and Bob join REEF co-founders, Paul Humann and Ned DeLoach, Jim Dalle Pazze, Andy Dehart, Anna DeLoach, and Marty Snyderman on the REEF Board of Trustees. Welcome!

    Please Help Us Reach Our Goal To Support REEF Interns

    Five days remain in our fundraising campaign to raise $10,000 for our REEF Marine Conservation Internship Program, and we are only halfway there! Help us reach our goal by donating today. Please consider supporting these enthusiastic young professionals as they gain critical career skills and provide REEF with invaluable program support. Although less known, the REEF Marine Conservation Internship Program is one of our most successful endeavors. Our interns are involved in many aspects in the day-to-day running of REEF, and many have gone on to work in academia, at government agencies, or for other ocean conservation non-profits. Your donation will help sponsor an intern, covering living expenses, mentoring and training, and diving opportunities during their four-month experience. To those who have donated already, thank you for making such a tremendous impact on the future of REEF’s interns and aspiring marine conservationists.

    REEF Staff Attend Regional Scientific Conference

    Grouper Moon Project collaborators - Scott Heppell (OSU), Bradley Johnson (CIDOE), Christy Pattengill-Semmens (REEF), Phil Bush (CIDOE), Brice Semmens (Scripps), l-r.
    Lad Akins, Adam Nardelli, and Stephanie Green at their research poster on demographics of lionfish derby participants.

    REEF Staff Dr. Christy Pattengill-Semmens (Director of Science) and Lad Akins (Director of Special Projects), joined over 300 scientists, resource managers, and fishers at the Gulf and Caribbean Fisheries Institute (GCFI) meeting last week in Corpus Christi, Texas. All three of REEF's major programs were represented.

    Christy presented a research poster on an analysis of patterns of rarity in fishes in the Caribbean basin using the REEF Volunteer Fish Survey Project database. Over 90,000 surveys from our citizen science program were used to explore where the rare things are, and why some places seem to have so many more of them than others.

    Lad co-chaired a session on Invasive Lionfish, featuring 21 talks on the current state of lionfish research and control efforts in the Atlantic. During this session, REEF Affiliate Scientist, Dr. Stephanie Green, presented her findings on the efficacy of lionfish derbies. Her research shows that one-day derby events like the ones REEF coordinates in Florida and the Bahamas can result in a significant reduction of lionfish densities, up to 70%, over 180 square km, all the result of volunteer teams. Lad and Nova Southeastern University graduate student and upcoming REEF Intern, Adam Nardelli, also presented a research poster on the demographics of participants in the 2013 Key Largo Lionfish Derby.

    And finally, REEF Grouper Moon Project collaborators, Dr. Brice Semmens (Scripps Institution of Oceanography) and Dr. Scott Heppell (Oregon State University) both presented talks during the fish spawning aggregation session, and we were also joined by collegues from the Cayman Islands Department of Environment (CIDOE). Brice presented findings from our research using Passive Acoustic Monitoring on a multi-species spawning aggregation on Little Cayman, and Scott presented a theory for why spawning aggregations have collapsed around the world and how our Grouper Moon research can be used to help inform future protection efforts.

    Putting It To Work: New Publication on Black Rockfish and Marine Reserves

    Black Rockfish. Photo by Dan Grolemund.

    A new scientific paper was recently published in the journal Evolutionary Applications that used REEF Volunteer Fish Survey Project. REEF data were used to validate population estimates of Black Rockfish throughout western Canada, Washington State, and Oregon. These results were then used to evaluate the efficacy of marine reserve networks in these areas. The authors of the study estimated the scale of dispersal from genetic data in the black rockfish, and compared this estimate with the distance between Rockfish Conservation Areas that aim to protect this species (essentially evaluating whether the reserves are "connected" enough). Their findings showed that within each country, the distance between conservation areas was generally well connected. The distance between the networks in the two countries, however, was greater than the average dispersal per rockfish generation.

    You can read the paper online here. Visit our Publications page to see all of the scientific papers that have been published using REEF data and projects. The paper's citation is: KE Lotterhos, SJ Dick and DR Haggarty. 2014. Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops). Evolutionary Applications. (2014) 238–259.

    Design by Joanne Kidd, development by Ben Weintraub