Chlorophyll levels for Tuna

[Rockhard]

I am learning more and more about the importance of Chlorophyll levels for all types of fishing. For Tuna, I know you look for edges of blue water that have favorable water tempatures, mark the spot and go. But, I would like to know if there are certain levels of Chlorophyll that are more favorable then others. The SST report shows levels all the way into Purple. Is there a level that is truely "the silver pullet" or just look for an edge? Any other info sharing on this subject would be greatly appriciated..
Rockhard

[HiTekRdNek]

As it has been explained to me. You want to look for a level around 1 or so. If it gets higher then that the water is off color and the tuna aren't as likely to be in it. Most of all you want to find the edge of the blue water. And work it from there.
Hope that helps.

[Chromaflage]

The magic line is where green water (higher chlorophyll) meets blue (lower chlorophyll). Although an indicator of water clarity, it is also an indicator where higher concentrations of bait fish might be found. Theoretically, the ideal spot is where the chlorophyll transition occurs and there is a significant temperature break in the same location.

[Rockhard]

The breaks of blue meets orange is the key... Clearity is not as important,, just the edges.. Alright,,, any other opinions on this matter?

[26striper]

I can't remember where, but I read that ideal level where the tuna like to feed is .4 to .7

[Spoonplugger]

Transition Zone Chlorophyll Front "TZCF" can be researched on the internet. The value used is .2 and marine biologists indicate that that is the home of the pelagic species. They also indicate that tuna frequent water up to .4 to .7 like 26striper mentions. You and I have caught them in the past in waters (as far as I can tell by looking at chlorophyll charts dated on the dates that we've fished) to be around 1.

A side note: the satellite chlorophyll charts view the surface of the water only, say at maybe .7, but how about down 100 feet, possibly a different layer of .2, we just don't know. Tuna do not live on the surface. Biologists estimate that they live at a depth of 100 meters or more, and surface during activity times.

Just food for thought.

Do a search for these two documents: 1. chai_jo_2003.pdf 2. Polovina_PIO_2001_TZCF.pdf

[Rockhard]

Originally Posted by Spoonplugger

Transition Zone Chlorophyll Front "TZCF" can be researched on the internet. The value used is .2 and marine biologists indicate that that is the home of the pelagic species. They also indicate that tuna frequent water up to .4 to .7 like 26striper mentions. You and I have caught them in the past in waters (as far as I can tell by looking at chlorophyll charts dated on the dates that we've fished) to be around 1.

A side note: the satellite chlorophyll charts view the surface of the water only, say at maybe .7, but how about down 100 feet, possibly a different layer of .2, we just don't know. Tuna do not live on the surface. Biologists estimate that they live at a depth of 100 meters or more, and surface during activity times.

Just food for thought.

Do a search for these two documents: 1. chai_jo_2003.pdf 2. Polovina_PIO_2001_TZCF.pdf

Thanks Jerry!
Lots to consider. want to go out with me sometime? It seems I could learn a thing or 2 from you... Is there a good book or articles that speak about Tuna?
Vince
vrosauer@graebel.com
503-936-6687 cell

[cooky]

Not sure if anyone is interested but here is a Chlorophyll (purple), temperature and salinity profile @ 44.652 125.115 from 08-13-07. Generally within the water column there are two distinct chlorophyll maxima- a surface and a deep chlorophyll max. Just thought some of you guys might be interested. Note that there is a major picnocline below 10m where the temperature drops to <10C. If I was a fishery biologist I could tell you all more about how this affects tuna but since i'm not perhaps some of you can tell me.

[TundraIII]

Regardless of water color.....look for temperature change of 1 degree.....blue, green, whatever....you find a temp swing, get your lines in the water.