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Effects of Water Depth on Color Visibility
mrymar 
 		  Port: Algonac, MI   01/03/2007 12:17
Brown
Posts: 55
 

This thread discusses the Content article: Effects of Water Depth on Color Visibility

If those wavelengths are already absorbed at certain depths then there is nothing to reflect off our beautiful lures and those colors are no longer visible.

Given perfect conditions, red and oranges are the first colors to disappear

I disagree with both of these statements.

In the first statement, it says the color is no longer visible. I feel that the color is visible, it just appears Black.

In the second statement, it says that the color disappers. I feel that the color would not disappear, it just appear Black.

Take a look at the image:

You can see the areas where the light is absorbed are black.

It really bothers me when I see the ad's for the Cajin Red fishing line. They claim their line disappers. It does not. It would appear black.
Mike
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Re:Effects of Water Depth on Color Visibility
t3pt6k 
 		  Port: Grand Haven, MI   01/03/2007 12:33
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Posts: 2447
 

I'm not sure I understand your premise

The science states that those orange and red wavelengths are acutally absorbed as they pass through the water and therefore not in the spectrum any longer as it relates to depth. Because they are absent at a certain depth; below that depth it is not possible for the lure to reflect that wavelength which is what changes the lures appearance to the eye.

The good news is that science has determined that salmon color vision is pretty similar to human vision.

Now if you look at the two charts - you'll notice a marked difference in regard to depths - the NOAA chart, the one pictured in this thread, is the absolute loss of spectrum wavelengths as it moves through the water. The other chart represents the effective depth at which those colors disappear from human vision.
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Re:Effects of Water Depth on Color Visibility
mrymar 
 		  Port: Algonac, MI   01/03/2007 14:29
Brown
Posts: 55
 

t3pt6k wrote:

The science states that those orange and red wavelengths are acutally absorbed as they pass through the water and therefore not in the spectrum any longer as it relates to depth. Because they are absent at a certain depth; below that depth it is not possible for the lure to reflect that wavelength which is what changes the lures appearance to the eye.


I agree with your above statement. I agree that the lures appearance would change. It will appear to us as black.
Mike
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Re:Effects of Water Depth on Color Visibility
t3pt6k 
 		  Port: Grand Haven, MI   01/03/2007 14:41
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Posts: 2447
 

Because there is not a hard line on color loss, as a result the entire time the lure is getting deeper it is changing color towards black (or a mix of remaining pigments, so often times a brownish not true black, because it may still be reflecting some of the other spectrum such as green, purple,blue etc... that still remains at that depth).

Kind of like fading out - so the red will start to diminish as the energy associated with those wave lengths diminsh with depth.
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Re:Effects of Water Depth on Color Visibility
tales2spin 
 		  Port: Manistee Mi.   01/03/2007 19:54
Steelhead
Posts: 126
 

Greg,
You state that "Science has determined that salmon color vision is pretty similar to human vision"
Can you lead me to your sources that come to that conclusion? I would be very interested in learning more about that.
Thanks.
Mike Coe.
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Re:Effects of Water Depth on Color Visibility
t3pt6k 
 		  Port: Grand Haven, MI   01/03/2007 20:36
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Posts: 2447
 

Mike,

Lots of resources, the articles that referred to it I seem to remember were SeaGrant or NOAA/GLERL articles somewhere

I jsut did a cursory search

http://www.cephbase.utmb.edu/refdb/pdf/7761.pdf
http://www.pigeon.psy.tufts.edu/avc/husband/avc4eye.htm
http://www.eyedesignbook.com/ch3/eyech3-d.html#D.%20Fish
http://www.everwonder.com/david/sharks/anatomy/
http://www.mar.dfompo.gc.ca/science/shark/english/eye.htm
http://www.enchantedlearning.com/subjects/sharks/glossary/indexe.shtml
http://www.oceansonline.com/sharks2.htm
http://www.seaworld.org/infobooks/Sharks&Rays/eyes.htm
http://www.milton.edu/academics/pages/marinebio/shark.html
http://www.photonics.com/spectra/applications/XQ/ASP/aoaid.196/QX/read.htm

I got the above bibliography from the PowerPoint presentation at:

http://www.cs.rit.edu/~rsg/FishVisualSystemGroup4.ppt

I haven't looked through all the information yet - but if you find something interesting let us know - the powerpoint does refer to color vision being similar to humans.
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Re:Effects of Water Depth on Color Visibility
jamoke 
 		  Port: MIlwaukee   01/11/2007 06:41
Steelhead
Posts: 147
 

So, if I'm a fish sitting at say 90 ft deep. A red spoon comes by me I'm not going to see it?
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Re:Effects of Water Depth on Color Visibility
t3pt6k 
 		  Port: Grand Haven, MI   01/11/2007 13:34
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Posts: 2447
 

you'll see it - but it won't be red. It will be brown to black in color depeding on the water clarity and sun conditions.

But if you're a fish at 90 FOW I want to hook up on you - defintely a new state record

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