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- Newsgroups: rec.boats.paddle
- Path: sparky!uunet!stanford.edu!ames!elroy.jpl.nasa.gov!ufo!bryan
- From: bryan@jpl-devvax.jpl.nasa.gov (Bryan L. Allen)
- Subject: Re: shark attack on kayak
- Message-ID: <1992Nov18.195657.8952@jpl-devvax.jpl.nasa.gov>
- Followup-To: rec.boats.paddle
- Summary: Color may be a factor, but there are others, too
- Keywords: sharks yellow zebra Dowd snacks munch-munch
- Sender: bryan@devvax.jpl.nasa.gov
- Organization: Telos Corp., Jet Propulsion Laboratory (NASA)
- References: <1992Nov17.222857.8196@PA.dec.com>
- Date: Wed, 18 Nov 1992 19:56:57 GMT
- Lines: 56
-
- In article <1992Nov17.222857.8196@PA.dec.com> rah@rampart.pa.dec.com (Robert Holt) writes:
- >I read about the attack on the sea kayaker off Ano Nuevo Is.
- >Fortunately he wasn't hurt, but I understand that the kayak
- >was holed.
- >
- >What precautions can be taken short of giving up the sport?
- >Is there a color or combination of colors which would make a
- >kayak look less like prey?
-
- Sharks detect prey with a variety of sensory inputs (including a
- resistive (electrical) sense); sight is used only if water clarity
- facilitates it and only during 'final approach' as it were. Their
- vision (in most species) is good, but the rest of their sensory
- 'bag of tricks' is in total rather amazing/awesome. And Great Whites
- have gotten used to pretty much getting their way for tens of millions
- of years. So I doubt there is some sort of 'magic bullet' solution.
-
- Anecdotally, though, John Dowd in his book "Sea Kayaking" mentions
- that shark researchers found that sharks preferred a color they
- dubbed "yum-yum yellow" which is the same color as that used for
- emergency life vests and life rafts (a grisly legacy of WWII?). He
- also mentions some evidence that they shy away from objects painted
- in wide swaths of alternating black and white (hmm, sounds like the
- color scheme of an orca). So if I ever get a Tsunami X-1 it will
- probably be white with black stripes on the bottom. The TV news report
- I saw concerning this incident showed gashes in an orange boat. Do
- sharks like oranges?
-
- Another poster mentioned that the best avoidance procedure is to
- avoid areas with high concentrations of sea lions. I concur. The
- problem is, there are lower concentrations of sea lions all up and
- down the Pacific Coast of the US.
-
- A sea lion surfaced next to me on Sunday. It was heading up the
- coast, I was going the other way. It took a breath, glanced my
- way, and dived back underwater. It didn't look too worried. My
- Prism is a bilious green, kind of like a 14-foot-long Granny
- Smith. Do sharks like apples?
-
- Ah, well. Back to lunch (chomp, chomp).
-
- >/*-------------------------------------------------------+
- > | Robert Holt - Digital Equipment Corp - Palo Alto, CA. |
- > | Internet: rah@rampart.pa.dec.com |
- > | UUCP: ...!decwrl!rah |
- > | DECnet: TENAYA::RAH |
- > | |
- > | "Conquer Tyrants. Fight Devils." |
- > | |
- > | Standard Disclaimers Apply... |
- > +-------------------------------------------------------*/
-
-
- --
- Bryan L. Allen bryan@devvax.jpl.nasa.gov
- Telos Corp./JPL (818) 306-6425
-