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Topic: Shark attack in Capitola  (Read 24394 times)

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ChuckE

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I'm curious to know how many of these yaks had fish finders on them and what brand and/or frequency they were set to.  These are more relevant questions.  A sharks primary senses are smell and electromagnetic sensors called ampullae of Lorenzini (as many of you know).
I've always wondered the same thing.  Turn on a FF with the transducer in your hand and you can feel the pinging.  According to some info I Googled up, certain ping rates can repel fish and some sharks, but there also a chance that other ping rates/frequencies can mimic live fish and have the opposite effect.  That may be something for shark researchers to look into.
« Last Edit: July 09, 2012, 10:29:01 PM by ChuckE »
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 I took the Family out on a Six-pak for the day Saturday out of Santa Cruz. On the way back in, I'm telling my Daughters Boyfriend about bringing the Kayaks over for some Salt-Water fun (He's only been on Local Lakes) When we got Chaged and met the rest of the Group on Capitola Beach He saw these signs and wanted to know if I really Liked him or not! Glad to hear Mel is OK!!!


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So glad you are OK Mel. Sorry to hear about your boat.

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ab10

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I'm curious to know how many of these yaks had fish finders on them and what brand and/or frequency they were set to.  These are more relevant questions.  A sharks primary senses are smell and electromagnetic sensors called ampullae of Lorenzini (as many of you know).

I've always wondered the same thing.  Turn on a FF with the transducer in your hand and you can feel the pinging.  According to some info I Googled up, certain ping rates can repel fish and some sharks, but there also a chance that other ping rates/frequencies can mimic live fish and have the opposite effect.  That may be something for shark researchers to look into.

One year in spearfishing in Baja, I tied an electric marlin teaser to the bottom of the flasher line I was using to get wahoo to come in.  The thing was supposed to sound like macs feeding and it made little pinging sounds when I held it up to my ear.  My buddy who lent it to me (a dfg biologist) said that the marlin fishermen love them, but apparently it's really hard to keep the sharks away.  Needless to say, I never saw a shark but I had a marlin come up below me and whack it with it's bill.  (so cool!)

I think it's a little of all of the above.  More sharks, more people, more yaks that feel, sound and smell like feeding fish.

Chuck - I'll email you the shark sense article I illustrated for Scientific American.  Very insightful.
« Last Edit: July 10, 2012, 09:47:36 AM by ab10 »


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Just for the record, back in 2009 when I got scoped I was not using a fishfinder, and did not have any fish aboard.
Aaron & Ben both had retained fish and had FF's deployed.

In my instance i think it was more about being farthest from the pack. We were still pretty close (within 100ft) , which is maybe why it gave me a once over rather than a hit.
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Regarding transducers .... my personal feeling is that they are on the wrong frequency or pattern.  If this were not the case, why do we not see regular shark attacks to fishfinder equipped boats (or at the very least a curious shark).  Not backed by anything more than observation .... IMHO


JT

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I just found a recent shark shield study... not very encouraging.

http://www.abc.net.au/news/2012-06-18/shark-shields-tested-attack/4076368



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What I get from that article is dont hang a fat tuna (or wsb for that matter) from the side of your boat and the ss should work. Notice how it WAS effective on the gws that were "silhouette hunting" in SA.
The sharks that were defeating it (somewhat) were trained to feed on those tuna. Not good test subjects imo.
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First and foremost I am relieved everyone is OK.

After reading this thread I needed some perspective.  I am a rookie and I have never been on the ocean.  I found the following to be interesting.

From Wikipedia
Since 1580 (yes 1580) there have been 1085 confirmed unprovoked shark attacks in the US - with 44 fatalities.

From US dept of labor
Deaths by Cattle from 2003-2007 - 108

I'm going fishing. :smt001
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