Using Side-Scan Sonar to Locate Derelict Fishing...
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Using Side-Scan Sonar to Locate Derelict Fishing Gear to Mitigate the Effects of Ghost Fishing in the Upper Gulf of California Solymar, R. 1 Berg, J. 1 1. Monterey Bay Diving. Sand City, CA. pc:http://www.vivavaquita.org/
Transcript of Using Side-Scan Sonar to Locate Derelict Fishing...
Using Side-Scan Sonar to Locate Derelict Fishing Gear to Mitigate the Effects of Ghost Fishing in the
Upper Gulf of California
Solymar, R.1 Berg, J.1
1. Monterey Bay Diving. Sand City, CA.
pc:http://www.vivavaquita.org/
Road map
https://www.worldwildlife.org/species/vaquita https://www.was.org/articles/Totoaba-Aquaculture-and-Conservation-From-sea-of-cortez.aspx#.WqVtSOjwaUk
Vaquita Totoaba Side-scan sonar
The vaquita (Phocoena sinus)
http://otlibrary.com/wp-content/gallery/vaquita-porpoise/0707vaquita_map.jpg
https://www.google.com/imgres?imgurl=http%3A%2F%2Fporpoise.org%2Fwp-content%2Fuploads%2F2018%2F01%2FSave_the_Vaquita_FB.jpg&imgrefurl=http%3A%2F%2Fporpoise.org%2Fsave-the-vaquita%2F&docid=iWAdLJHQiRyNgM&tbnid=eMpmanGKm4P1qM%3A&vet=10ahUKEwipi4igjtTZAhUM3WMKHRwPDe4QMwjeASgEMAQ..i&w=1200&h=630&bih=954&biw=959&q=vaquita%20picture&ved=0ahUKEwipi4igjtTZAhUM3WMKHRwPDe4QMwjeASgEMAQ&iact=mrc&uact=8
The totoaba (Totoaba macdonaldi)
http://www.dw.com/en/the-vaquita-the-totoaba-and-the-curse-of-the-swim-bladder/a-35930002
http://www.marinemammalcenter.org/science/Working-with-Endangered-Species/vaquita.htmPC: Omar Vidal
The flotillahttps://www.facebook.com/MuseoDeLaBallenaPage/
PC: Jared Berg
Our “fish”
PC: Ryan Solymar
Trawler marks
M/V Sam Simon
http://seashepherd.wikia.com/wiki/MY_Sam_Simon
“Grampine” marks
Evidence of poaching
Illegal net
PC: Ryan Solymar
End of life uses
PC:Jared Berg
http://footwearnews.com/2017/focus/athletic-outdoor/adidas-parley-for-the-oceans-ultra-boost-sneakers-photos-340854/
ChallengesPossible sources of error include defining:
● buried nets● “net balls”● long lines.
Our trained staff and field calibration can mitigate this ambiguity
Summary
There are less than 30 vaquita left in the world
The illegal totoaba fishery is likely causing this decline
Side-scan sonar is an effective tool for finding gill nets
https://www.worldwildlife.org/species/vaquita
https://www.was.org/articles/Totoaba-Aquaculture-and-Conservation-From-sea-of-cortez.aspx#.WqVtSOjwaUk
AcknowledgementsIn no particular order: Museo de la Ballena y Ciencias del Mar, The Crew of El Barco Narval (Luis, Pepe, Aurelio, Gil, Machor), CIRVA, Dr. Lorenzo Rojas PhD, Dr. Armando Jaramillo PhD, and Gustavo Cardenas MS, Sara Amozurrutia and Mauricio Nájera, World Animal Protection, Elizabeth Hogan, Joel Baziuk, Roberto Vieto, WWF Mexico, Sea Shepherd and the crews of M/V Farley Mowat and M/V Sam Simon, Andy Walling, Billy Palmer, all the panga drivers and logistical support teams, Vaquita CPR, Ricky Rebollido, Parley for the Oceans, and everyone else who has had a hand in protecting the vaquita. We would also like to thank Dr. Steve Moore and the EEL at CSUMB for helping fine tune our presentation.
PC: Joel Baziuk
All acoustic imagery provided by Monterey Bay Diving Inc.
