sharks, and thier behavior

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I think great whites get far too much negative and undeserved attention worldwide for their perceived aggression and ability to attack. It seems every time there's a shark incident, the press automaticly attributes this to a killer great white and a ocean-wide shark destruction program inevitably transpires until enough are killed off to satisfy an ignorant public.

In South Africa it is becoming more and more apparent that our zambezi (bull shark) is in fact likely to be responsible for more attacks than previously believed. The zambezi has the same upper tooth structure as a great white, frequents the dirty shallow waters found in river mouths, where surfers love to surf the point breaks, and has the ability unlike other sharks obviously to swim up into fresh water rivers and lake systems. It's an opportunistic feeder and will happily taste any easy meal flapping around on the sea surface.

Great whites on the other hand traditionally frequent deeper water further away from populated areas. They're surprising difficult to find when you're looking for them, unless you chum the water excessively to tease them in. Other shark species by contrast are commonly seen on offshore reefs within their seasons and will frequently come in for closer viewing out of their own curiosity. The most curious sharks are almost always juveniles who seem to be on some sort of self-learning program anyway, and similarily almost all shark attacks seem to be from juvenile shark species. There's been an interesting correlation between human children and sharks with the way they mouth objects in their juvenile years as a means of feeling and learning. It's commonly believed that this is frequently all that these great white incidents are: an unfortunate clash of worlds as a shark mouths a surfer or spearfisherman. Almost every single time, the shark lets go and the injured party gets away and makes an apparent heroic escape. Unfortunately such is the awesome power of a whites jaw, that the injuries sustained in this mouthing process frequently prove fatal for us fragile creatures.

I think worldwide we need more in the way of education for the general public, and a greater understanding of the habitat and mannerisms of shark in general. So many of our fears are driven by our own arrogance and ignorance.

A most excellent source of information on sharks is through the KwaZulu NAtal Sharks Board in Durban, South Africa. Check out their website at www.shark.co.za

kind regards

Dennis
 
Interesting website Dennis. The device that emits an electrical current - I thought those were found to be ineffective. Anybody know anything about these devices or had any experience with there use?
 
Well, Valerie Taylor made some positive comments about it in the last edition of Alert Diver, and she's probably spent more time with dangerous sharks than anyone alive. Graced the cover of National Geographic twice, designed the first chain mail shark suits, and filmed "Blue Water, White Death." Also did a lot of live footage for Jaws.
 
I'm guessing it was Valerie Taylor who made it necessary for the parks people to starting making signs that said, "please don't feed the bears".

Chain mail. If she'd just quit sticking her hands in their mouths, she wouldn't have needed chain mail in the first place.

Ye gods.
 
doole....

Antics like handfeeding or riding sharks are not research, just sensationalism for the camera. Oooh, look how bold I am and how dangerous this is...like the lame Crocodile Hunter schtick...
 
If you are going to post rude comments about the Taylor's or anyone else, please back them up with citations and/or links. I do understand where you're coming from, but there are a large cadre of marine scientists (including me) that either know these fine people firsthand or have read their research works. And the consensus there is very positive. Comparing Val Taylor to Steve Irwin is unfair. More accurate comparisons (and which are often made) would be with Sylvia Earle, Eugenie Clark, Al Giddings, and Cousteau (Jacques, not the other guy).

Anyway please stay on topic... which I believe was the efficacy of electrical shark deterrents.
 
Valerie Taylor (it was doole's post that introduced her name). My statement was directed at underwater rodeo stunts (i.e., handfeeds, Manny (of Aquanaut infamy) riding the dorsal fin of a large tiger shark, ad nauseum...). Comparison of these acts to those of the zoological carnival act Steve Irvwin provides is more than fair. I wouldn't expend any time to provide a link justifying it, tho...

I have a certain amount of marine science in my background and am familiar with all the names you dropped and their research. For example, I find Al Giddings' studies while free-diving with great whites quite interesting.

My apologies for straying from the thread topic which is, fyi, 'sharks, and thier (sic) behavior,' and not specifically the efficacy of electrical shark deterrents.
 
I have a tendency to "blow off the handle" about bad science (read my bio). I defend (most) wildlife photographers in the same light. Sorry if I got pissy.

Electric shark deterrents are where the thread has left off. As far as I know there are two models out for divers. One is a two-component piece that sets up a field sharks can detect (and some can pick up two-billionths of a volt) and supposedly shy away from. I forget about the other model, maybe it's just a larger size of the other one.

I think they're tested/used mostly in Australia and South Africa. Problem with an electric field-generated deterrent is that the detection range for a shark is incredibly short... under a meter. Maybe they get around with by upping the amps or something. In any event if say Jaws comes pounding down behind you, by the time he picks up the field, he's likely to have bitten or banged into you already. I'm sure the application is better suited for smaller sharks in say... feeding situations where they may make close passes.
 
at this web sites, you can find information about attack prevention. I have read information about sharks attacks in many others web sites, and all are more or less the same, and the only fact all seem to agree is that sharks behaivor is umpredictable, we still cannot define a pattern or certain characteristics they'll do. I think you should follow your comon sense when seeing a shark act strange or different than the rest of the fishes, and also stay close to a group will help you look bigger and may reduce the chances of an attack. try to stay calm, and keep you eyes on the shark while you leave the spot. but remember that most sharks go away when they notice the bubbles....

http://www.sharkfriends.com/attackprevention.html

http://www.sharksurvivor.com/tips.html

happy dives....
 
No, it was not my post that introduced her name. Furthermore, I am under no specific obligation to include links or references in my posts.

And shark feeding is unenlightened, regardless of who does it.

Chain mail for a diver is just plain bizarre.
 
https://www.shearwater.com/products/peregrine/

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