Cmon CB, are you just yankin my chain or what ???

"THERMAL IMAGING" and "DIFFERENT TYPES OF FISH HAVE DIFFERENT BODY TEMPERATURES".

Almost all fish are strictly cold-blooded animals - that means their body temperatures are the same as the water they are in. Some tunas are an exception - they have the ability to raise their body temps slightly above the surrounding waters.

Now if you want to tell me that fish finder does a very good job at discriminating between the different body shapes that different species of fish have, and even that this differing sonar (sound not temperature) reflection can be displayed as a different color -- yeah, that I could believe.

But a fishfinder that uses thermal imaging to identify different species of fish by body temperature ???

No way, CB. I was born at night, but not last night. ;)