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I don’t fish with a camera. What is actually happening?
On your flasher it would appear the fish is below the bait coming up for it, which is partly true. However, because of the way sonar works, what is actually happening is the majority of what you are seeing is the fish is moving from the very outside of the cone towards the center of the cone.
It takes sound waves longer to travel to the very outside of the cone than it does to travel straight down. Thus fish on the very outside of the cone will appear deeper than the actually are in relation to your bait. As the fish approaches your bait it will appear to rise some on the flasher.
Now with all that said, most species prefer to feed up and moving your bait up or pulling it away from them does get them to rise. So, on your flasher you are seeing the fish first enter the cone, and slowly rise as it approaches your bait. On a flasher this looks like the fish is below the bait and moving up after your bait.
If you adjust your gain so that you are using the minimal amount of gain to see your lure. You can use your flasher to not only tell where the fish is inside your cone, but what size of fish it is and sometimes what species. On the MarCum LX-5 I usually have my gain set just under 2 in the 40 ft mode on Mille Lacs. This allows me to see my bait, and will give me a nice weak signal as fish first enters the cone and a nice red signal when the fish is very close to the bait.
In order to have an idea what species a fish is, you need to see a lot of them. For instance, on Mille Lacs it does not take long to get used to what perch look like. Early season they are down there pretty much all the time. Walleye give off a much different signal, as the return is much larger on the flasher screen and usually there is almost a double return. You can never say with 100% accuracy what you are looking at but using a flasher gives you a very good idea after you get used to seeing what return signals look like from various fish.
Yes, I have probably spent way to many hours staring at a flasher