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Message: <blockquote data-quote="Ray Clark" data-source="post: 511810" data-attributes="member: 31103">Well, if fish finders spooked fish regularly, I think we'd see at some significant discussion of it by professional anglers and others on YouTube.  What I have seen discussed is boat speed, trolling motor noise (particularly the jerky on/off nature of spot lock) and simply not presenting baits to the targets in the manner they desire.I don't think you can draw a conclusion from one event.What I have seen is how fish finders impact whales and orcas.  They're very sensitive to the sonar.  I was salmon fishing on the Inside Passage in British Columbia back in 2016.  We were fishing calm waters one morning when a pod of orcas passed nearby.  The guide, a 70 year-old First Nations member, said they wouldn't approach the boat  as long as he was running the fish finder, but that they would approach if he turned off the FF.  He turned it off, and a few minutes later, one of the orcas gently surfaced a few feet off the port side of the boat and eyed us.  It was one of the most amazing things I've ever seen.  The guide switched the FF back on and the orca gently slid back under the water and slipped away.</blockquote>