Kayak Color and sharks...

[dos ballenas]

nice... it only took 11 minutes for your response... I was expecting less I can tell you have thought about this a lot...

A wise man once said "always cast your surface iron into the sun and then fan out from there until you see which angle is getting bit best"

I think the important thing is to learn as much as we can from shark attacks that occured in the past. Most occured in low visibility conditions.

[Fiskadoro]

Originally Posted by dos ballenas

nice... it only took 11 minutes for your response... I can tell you have thought about this a lot.......

Yeah well... Though that was from a recent article it was hardly a new concept.

Actually when I get some time though I will read up on their research.

Past studies have shown that sharks have both rod and cone photoreceptors in their eyes, which would suggest they could see color in some manner, but studies have shown that their vision seems to be set up to enhance the contrast of targets silhouetted against a background, or more technically that the cones are specialized for contrast over wide range color perception.

This specialization though is not anything new as I could find you papers about it that are more then fifty years old. That is why I kept talking about color in relation to how it contrasts to it's background. Sharks eyes key on contrast.

That said: I did find your post interesting. especially this part which is about roughly half of the sharks they studied.

Originally Posted by dos ballenas

"However, cones were found in the retinae of 7 species of shark from three different families and in each case only a single type of long-wavelength-sensitive cone photoreceptor was present. "

You may not know this but the long-wavelength colors that those specialized cone photoreceptors are keyed for are yellow orange and red.

So though ten out of seventeen sharks species they studied did not perceive color so much as contrast those that did had eyes set up for enhanced yellow orange an red perception, at least that is what I got on a quick glance over.

Jim

[surfnutnj]

Originally Posted by Jim Day

Yeah well... Though that was from a recent article it was hardly a new concept.

Actually when I get some time though I will read up on their research.

Past studies have shown that sharks have both rod and cone photoreceptors in their eyes, which would suggest they could see color in some manner, but studies have shown that their vision seems to be set up to enhance the contrast of targets silhouetted against a background, or more technically that the cones are specialized for contrast over wide range color perception.

This specialization though is not anything new as I could find you papers about it that are more then fifty years old. That is why I kept talking about color in relation to how it contrasts to it's background. Sharks eyes key on contrast.

That said: I did find your post interesting. especially this part which is about roughly half of the sharks they studied.

[/FONT][/I]

You may not know this but the long-wavelength colors that those specialized cone photoreceptors are keyed for are yellow orange and red.

So though ten out of seventeen sharks species they studied did not perceive color so much as contrast those that did had eyes set up for enhanced yellow orange an red perception, at least that is what I got on a quick glance over.

Jim

sooooo.....anyone want to buy a RED Tarpon 120?

J/K...hopefully the tax man does not try to eat me while I am fishing. If he does at least I died doing what I love to do. (not driving to work) I always say that.

[Hobie-Pedaller]

very interesting & thought provoking points & topics in this thread.

yum, yum, yellow..... i resemble that.

[dos ballenas]

very interesting indeed...

even more interesting in the resurfacing of the infamous Hobie-pedaler! that sure was a long breath hold

[Hobie-Pedaller]

Originally Posted by dos ballenas

.....the resurfacing of the infamous Hobie-pedaler! that sure was a long breath hold

unfortunately, i haven't been fishing, nor on any of the kayak boards since early last Summer.

i've been traveling in & out of state over past year, dealing with a death in family back in Texas, and the subsequent repair & sale of a house back there.

finally finished with all that above, and now ready to get back into the water for some fishing. just had to replace the sonar on my Yak, which had the transducer wiring fail last year, due to salt water corrosion. yak is all repaired and ready now. just bought the 2011 Fishing license. I'm finally all ready to get back out there again, within the next few days, but now we have rain coming for the next 3-5 days.

so NEXT WEEK, I will be back out on the water for sure. SD Bay at first, for a few trips, then I'll get out to LJ soon after that. Can't wait. WAY TOO LITTLE FISHING FOR ME IN PAST 2-3 YEARS.

[dos ballenas]

Originally Posted by Jim Day

This specialization though is not anything new as I could find you papers about it that are more then fifty years old.

Jim

fifty years ago? lets see it.... I love papers from the good old days...

so have you learned anything you didnt already know from the replies to this post?

You should talk to Keith Poe...

[bubblehide]

Originally Posted by dos ballenas

fifty years ago? lets see it.... I love papers from the good old days...

so have you learned anything you didnt already know from the replies to this post?

You should talk to Keith Poe...

I think Keith and Jim are pretty good friends, but i could be mistaken.

[Fiskadoro]

Originally Posted by dos ballenas

fifty years ago? lets see it.... I love papers from the good old days...

I don't have time to look it up but Sam Gruber was I think the guy who was writing about this back in the sixties. Before him they thought that sharks mainly just fed by their sense of smell. If I remember correctly his definitive paper sharks and their vision was published in 1965, but he was pushing his theories back before that in something like 1961. There is probably some shit about him online somewhere. I first read about him in Scientific America or some other Science mag back when I was fishing Tigers, Hammers, and Bullsharks in the surf in Texas as a kid.

Originally Posted by dos ballenas

...so have you learned anything you didnt already know from the replies to this post?

Nope. Not really, I wish. The article you talked about just kinda backs up what I already knew, though I'm not sure you get that. On the bright side, I could say this thread has given me some insight in regards to you.

How about you... Have you learned anything?

Originally Posted by dos ballenas

You should talk to Keith Poe...

I've known Kieth for almost a couple decades now. I fished with him mainly back in the 90s. I designed and built his bait tank for his current boat, and some other gear, and even painted it for him. I know him pretty well, better then most as I've spent many hours on the water with him. Kieth and I have talked endless hours about every aspect of shark behavior that we could think of. I was already building shark jigs when I first met Kieth, so I'm sure the topic jig color and sharks came up more then once.

Kieth is Kieth: people either love him or sometimes hate him, but deep down he's got a good soul and he just loves to fish sharks. Ultimately when shark fishing really started taking off back in early 2000s Kieth and I took different paths. I used to post all kinds of info about them and just quit. If I'd been smart I would of written a book like Archer and made some money off it, but I basically just quit posting about them online, and giving out info about fishing them, because I was concerned that they were going to get over fished. Kieth felt that by posting he could direct peoples attitudes, and influence them into preserving the resource, I'm far more cynical when it comes to people then he is.

Jim

[Gigafish]

Great read.

[bus kid]

Originally Posted by Fiskadoro

I've known Kieth for almost a couple decades now. I fished with him mainly back in the 90s. I designed and built his bait tank for his current boat, and some other gear, and even painted it for him. I know him pretty well, better then most as I've spent many hours on the water with him. Kieth and I have talked endless hours about every aspect of shark behavior that we could think of. I was already building shark jigs when I first met Kieth, so I'm sure the topic jig color and sharks came up more then once.

Kieth is Kieth: people either love him or sometimes hate him, but deep down he's got a good soul and he just loves to fish sharks. Ultimately when shark fishing really started taking off back in early 2000s Kieth and I took different paths. I used to post all kinds of info about them and just quit. If I'd been smart I would of written a book like Archer and made some money off it, but I basically just quit posting about them online, and giving out info about fishing them, because I was concerned that they were going to get over fished. Kieth felt that by posting he could direct peoples attitudes, and influence them into preserving the resource, I'm far more cynical when it comes to people then he is.

Jim

so Jim how is Keith, last I heard he was chasing swords off cat.

and yes I see that the post is waaayyy old.

[Fiskadoro]

Originally Posted by bus kid

so Jim how is Keith, last I heard he was chasing swords off cat.

I haven't seen or talked to Kieth in a long while. He's posting at Allcoast again and supposedly in the process of setting up a new boat a 31 Bertram.

I look at Kieth as kind of a internet fishing dinosaur. By that I mean that there were a group of us back in the late 90s that really put a lot of effort into trying to exchange fishing info publicly online, and as a result kind of ended up with sort of a weird internet fishing celebrity status, and it effected different people different ways.

Kieth loves to fish, but also wants to be an important figure in the fishing community. I think that might have a bit to do with his new obsessions: Deep dropping for swords and trying to catch a local salmon shark. At any rate he's got the sword bug, and has been fishing them deep, trying to find a way to consistently target and catch them.

I wish him luck on that one.

No-one I know has gotten the deep drop sword thing to work here in So Cal. We just do not have the gulf stream and structure they have in Florida, or the predictable upwellings they have in Venezuela to make it work. Years ago my buddy Mike and I used to joke that the three hardest fish to catch local are Swordfish Bigeye and Opah. Since then I've got a local Bigeye and he's got an Opah but though we've baited more then twenty some between us neither of us have got a local sword.

There was a good debate about the various methods that might actually work here over at BD last winter.

http://www.bdoutdoors.com/forums/fis...ml#post2550594

Worth a read if your into swordfish, but you might want to note that no-one there claims to know of a way to consistently target them.

Jim

[bus kid]

Originally Posted by Fiskadoro

There was a good debate about the various methods that might actually work here over at BD last winter.

http://www.bdoutdoors.com/forums/fis...ml#post2550594

Worth a read if your into swordfish, but you might want to note that no-one there claims to know of a way to consistently target them.

Jim

Thanks Jim, yeah he was taking a beating over at bd I saw the post when it first went up and the subsequent cartoons and all. I used to see him in that stealthy boat all the time blasting out of LB harbour. One day hes going to figure it out (if he hasn't already and is just keeping it on the down low) Innovation eventually comes through failure, nothing but best wishes for him.