Fishing for walleye question

[SkunkedAgain]

Kent, that is a really good question, I've been trying to put in enough time to start to recognize what I'm seeing and it's hard on my 9" unit.  Pretty sure these were crappie 









I caught a 12" LMB right after I was watching the marks below.




Although the pattern is completely different in this grouping, I was catching crappie this morning, but as you can see they were moving through...



I couldn't find any pictures, but I have seen the larger and longer marks showing up when I caught my catfish, but to quantify what is a bigger mark, it's usually just depends on what you have been seeing earlier the same day.  You recognize the difference, but it's very hard to explain... Mine really lacks the detail to tell species, but it does let you know they are there...  Later J