Sonar returns on a fish finder - Pensacola Fishing Forum

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Old 05-11-2015, 05:04 PM   #1
Ruby Red Lip
Join Date: Jun 2009
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Default Sonar returns on a fish finder

Quick question: I was told the other day that you can tell what type of fish is showing up on the fish finder simply by the color it is returning? Is there any truth to this? For example, red snapper will be red marks because of the density of their swim bladders, and ajs will mark as a light blue. Is this true?
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Old 05-11-2015, 06:27 PM   #2
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Not that simple - but with a little practice you can get an idea of the types of fish down there - Alot depends on you machine - transducer - water depth and conditions.

In general - the larger the change in desitity, the stronger the return signal. fish with larger swim bladders make the stronger marks - So if you machine is set up with red as a strong return - the big fish with big bladders will make red marks.

Size matters also - a large fish will sometimes create an arch or comma shape mark as it passes through the sound beam.

As it gets deeper, the signals become weaker and its more difficult to tell fish near the bottom are big or small.

For Snapper fishing in 100 ' or less - sows in the water column look big and mark up well - triggers not as strong, AJs look big too i think - I would find it hard to tell big AJs and Sow snapper apart just from the show in 100' or less.

Nothing beats hours of watching - seeing what you pull up, or having divers tell you what is down there !
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Old 05-11-2015, 08:03 PM   #3
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Exactly what Mullethead said. After watching it enough, you will be able to distinguish triggers from snapper and snapper from mingo's. Just takes time on the water.
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