I could if all of the conditions were right and the fish cooperated. The color of the returned sonar signal is based on the amount of sonar that reflected off of the fish. The larger and more dense the fish (from the transducers viewpoint, not from the side) the more sonar gets reflected back to the transducer. The area of the sonar beam that the fish passes through can also influence the amount of sonar that gets reflected back as can several other factors.
That being said, I have been on board boats several times where the boat Captain/operator correctly identified the species of fish that we saw on the sonar. This was confirmed by the fish being caught. They were able to do so based on the sonar returns they saw on the sonar and due to their knowledge and experience fishing for those species of fish.


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