Sonar Noob question
 

While out last weekend, I was paying very close attention to my sonar (Hook 4 chirp). I could see various (I am guessing) schools of bait fish. In some locations I was watching a rather large signal zagging up/down through the water column. I could tell it was not kelp as the kelp shows very clearly on my display, and is usually a fairly clean line at a steep angle. I was told that this could be a YT hunting? I should have snapped a picture. Next time I will.

Anyone have any samples of what YT look like in sonar?

Sorry for the noob question, but yall are the real experts here.

Yellows and Seals often show up like that on my HB unit.