Chlorophyll is produced by plankton. Chlorophyll imagery is obtained from satellites and helps determine the location of blue water versus dirty water.

The data from the satellites is processed to display relative Chlorophyll concentrations. The range displayed on our charts goes from a low concentration of 0.01mg/m3 to a high concentration 30mg/m3.

Different levels of Chlorophyll will be represented by different colors in each pixel.

Blues/greens can be clear water.

Yellows/oranges/reds can be dark green cloudy water to muddy water.


Knowing where phytoplankton blooms are concentrated can be an excellent indication of where baitfish (which the targeted fish are feeding on) should be concentrated. To find the baitfish, one should look for the best water color. The boundary areas between blue and green water, often referred to as color breaks, will typically stack up bait and hold above-average numbers of predatory game fish.

Not only does chlorophyll data indicate water color, it can be a useful tool to predict water temperature when you can't get a clear satellite image.


  1. Hit Imagery & Overlays
  2. Choose Chlorophyll under the Imagery header
  3. Browse raw satellite imagery
    1. Due to cloud cover, some images may be far better than others
    2. Images are sorted by age – most recent at the top of the list.
  4. Select the image you'd like to overlay on the map
  5. Once the image is highlighted, hit Done in the top right of the app screen
  6. Navigate around the map, centering your crosshairs over your region of interest.
  7. See the chlorophyll concentration level under the mg/m3 heading
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