I found this video rather interesting and subsequently sent a link of the video to Dr. Chris Lowe (Professor Dept of Biological Sciences CSULB) since he has done a fair amount of research on GWS and lectures on them on the west coast. He authorized me to share his response:
On May 14, 2014, at 10:27 PM, Chris Lowe <Chris.Lowe@csulb.edu> wrote:
Hi Oscar,
Very interesting video. In my opinion, the behavior isn’t that unexpected. It is not uncommon for a subadult white or tiger shark to exhibit that kind of investigative behavior. Did the spearfisher have a string of dead fish on him/her? That might explain why the shark was coming as close as it was. White sharks do eat other things, not just marine mammals. We know that adults will also eat fish and squid. While this probably isn’t preferred, it must obvious make do.
Impressively, the diver did all the right things. Keep their eye on the shark, kept the speargun out in front of them and poke at the shark when it came near, and kept their back to the reef. That could be a great training video for teaching divers how to deal with a large shark encounter, where the shark is clearly investigating the situation. If the diver had a stringer of fish with them, it would have been more wise to give it up and head the other way. In Hawaii, we always advise spearfishers to put their fish on a long floating stringer and to keep the fish off their body.
Chris
Dr. Christopher Lowe
Professor
Dept of Biological Sciences
California State University Long Beach
1250 Bellflower Blvd.
Long Beach, CA 90840
Ph: 562-985-4918
Fax: 562-985-8878
Facebook: CSULB Shark Lab