kid coulson Posted July 4, 2013 Share Posted July 4, 2013 Alright, what causes this/what is it? Im sure its not a school of kings playing leap frog! Link to comment Share on other sites More sharing options...
BenLubbs Posted July 4, 2013 Share Posted July 4, 2013 I have always wondered the same thing on my graph. Link to comment Share on other sites More sharing options...
CITM Posted July 4, 2013 Share Posted July 4, 2013 I'd guess air bubbles over the transducer, probably due to waves. Link to comment Share on other sites More sharing options...
coralee Posted July 4, 2013 Share Posted July 4, 2013 I thought that was an echo bouncing back and forth but not sure about that. Link to comment Share on other sites More sharing options...
Richard Posted July 4, 2013 Share Posted July 4, 2013 I understand it to be air bubbles as well. Link to comment Share on other sites More sharing options...
sherman51 Posted July 4, 2013 Share Posted July 4, 2013 the only fish I've seen stack is crappie but they didn't look like that line of marks. they were stacked but was more offset and not in a straight line.sherman Link to comment Share on other sites More sharing options...
LongLine Posted July 4, 2013 Share Posted July 4, 2013 Possibly a thermal plume. i.e. vertical temp gradient with debris caught in it. Link to comment Share on other sites More sharing options...
Paulywood Posted July 4, 2013 Share Posted July 4, 2013 I normally see that on my boat when the back end shifts around due to wind or change in direction so I would guess some kind of turbulence. Link to comment Share on other sites More sharing options...
Sea-Mac Posted July 5, 2013 Share Posted July 5, 2013 I always assumed that to be a school of fish and the reason they stack up like that is because the tranducer is picking up multiple fish @ the same depths within the "signal cone".I know when I start marking that it usually isnt long til fish on. I would like to know the real proven reason for this also, good question. Link to comment Share on other sites More sharing options...
SeaCatMich Posted July 5, 2013 Share Posted July 5, 2013 Never seen anything like that on any of my graphs over the years. What brand/model is the graph? Link to comment Share on other sites More sharing options...
fishy1 Posted July 5, 2013 Share Posted July 5, 2013 If you are fishing near another boat at times you may see interferences from the other boats similar to what you are showing due to frequency interference from thier graph or any other equipment that is sending a pulse thru a transducer. Link to comment Share on other sites More sharing options...
jimbobber Posted July 6, 2013 Share Posted July 6, 2013 ive been told its sea fleas we always start seeing lots of that when they are thick. Link to comment Share on other sites More sharing options...
kid coulson Posted July 6, 2013 Author Share Posted July 6, 2013 Thanks for the replies guys.Graph info: Hummingbird 798. I have the sensitivity and most of the settings turned way up(most on max) when out on the big lake. Helps me to see the "arches". Freq is 200/83 KHZ(when in dual beam mode). Its mounted on the back of my 16.5 aluminum boat. I don't get these marks like that all the time. Every once in a while, and only on the big lake as I can recall. When I'm on MAC or muskie fishing a smaller inland lake my settings are TOTALLY different and I don't recall seeing this phenomenon. I kinda thought it might be a rigger cable as the front edge of the marks are so straight all the way down,.. maybe on a tight turn or something??But,..I never mark the cable on the graph. I do mark the ball if going slow enough. I have a couple e-mails out to Humminbird "pro staffers" but have not heard a thing back yet. Link to comment Share on other sites More sharing options...
joelsanders Posted July 6, 2013 Share Posted July 6, 2013 could it be a bait kill ,where they spiral slow up to the surface.? Link to comment Share on other sites More sharing options...
SUPERTRAMP Posted July 6, 2013 Share Posted July 6, 2013 Its usually air bubbles, it can also occur when u r in close proximity to another boat that has their gain turned way up. Check and see if the stacks occurred when u were speeding up or going with the waves and get a big push. Link to comment Share on other sites More sharing options...
Creekerman Posted July 6, 2013 Share Posted July 6, 2013 I've had the same show up where I've marked it before and passed over the same area more than once...multiple times. I wonder if it is underwater structure...maybe even shipwreck materials? I've had it show up on flat water days too. Link to comment Share on other sites More sharing options...
Patio Posted July 6, 2013 Share Posted July 6, 2013 Maybe Hummingbird might have an explanation. Link to comment Share on other sites More sharing options...
Rascal Trophy Fishing Posted July 7, 2013 Share Posted July 7, 2013 I also suspect air bubbles, where the transducer in a wave is just too close to the motor. On a 16' boat, this may be the case, as you have a narrow 4'-5' beam. I would also suggest that you try the separate single frequency, and use about a 3/4 gain setting, no need for the maximum imho, unless you are over 250' fow. Link to comment Share on other sites More sharing options...
Yankee Troller Posted July 8, 2013 Share Posted July 8, 2013 I've seen that on Lowrance, Furuno, and even now on my Humminbirds. I'm dying to know myself. A friend of mine has sent this image to the engineers at HB, so i hope to have an answer soon. Link to comment Share on other sites More sharing options...
CAC Posted July 9, 2013 Share Posted July 9, 2013 My lowrance does this too on my 16.5 foot Lund. I will reduce my gain to see if that helps. Thanks for the great topic Link to comment Share on other sites More sharing options...
Sea-Mac Posted July 9, 2013 Share Posted July 9, 2013 I get it on my Lowrance and cant recall ever seeing it in under 100 fow. I sent the ? out to Lowrance product support today also. Link to comment Share on other sites More sharing options...
Sea-Mac Posted July 11, 2013 Share Posted July 11, 2013 Lowrance product support says they would say it looks like interference from other sonar sources. Link to comment Share on other sites More sharing options...
2UNREEL Posted July 12, 2013 Share Posted July 12, 2013 Could be an echo from a flasher off a rigger or a diver and thats how the processor interperates it.....just a guess Link to comment Share on other sites More sharing options...
joelsanders Posted July 12, 2013 Share Posted July 12, 2013 It's the crackin!! Link to comment Share on other sites More sharing options...
hear fishy fishy Posted July 12, 2013 Share Posted July 12, 2013 I have also seen this on my Garmin many times and would like to know what it is. Link to comment Share on other sites More sharing options...
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