Kayak Sonar Discussion

[GregAndrew]

Originally Posted by chris138

Hey Gang,

I feel like a lot of people have the same kinds of questions when it comes to sonar... Especially from those folks who have just recently got their first fish finder, or have upgraded or switched brands. In internet forums, you typically want to avoid having a bunch of different threads about the same topic. It makes it hard for people to go back and search for the info they need.

Some of you who have followed me for a while know that I like to offer sonar tips to fellow kayakers when I can. So I thought I would start my own sonar thread, and try to make it more of a centralized location for some of this info.

The format I envision is that people can ask some of their sonar questions here. I'll do my best to check in often, and answer the best I can. Other more experienced members should chime in and address whatever they want, or tear my theories to shreds if you want... I can take it don't worry (;

What the thread is NOT for: Put-downs or trolling others, arguing with others about which brand or product is better than another, online deals or people trying to sell their stuff. I use Lowrance, but I will not try to sell their stuff or try to convince you that it is better than another product. This should be the place for technical discussion and sonar theory.

I'll kick it off with a few sonar tips for beginners, and a few screen shots from my IG archives


1. Try to mount the transducer in the water. Yes, shooting through the hull works, especially if installed by experts like the guys at OEX. I've done it both ways with the same FF and trust me you are losing sensitivity and signal strength. I would go with a RAM boom arm over a through-hull install every time.

2. Use separate power supply for FF and bait tank. This is for obvious reasons, if one system goes down you don't lose the other device. An entry level sonar like an Elite 4x for example uses very little amperage without GPS. The pump will drain batteries fast, especially 12V. Learn how much juice you need for your setup, and size your batteries appropriately.

3. Stuff will corrode, and need to be repaired. Next time you're at OEX or west marine, buy a bunch of extra terminal connectors, heat shrink butt connectors, and wire. Have all that stuff with you at the launch so when your sonar doesn't turn on, you can repair it right then. Make your wiring easily accessible and give yourself extra slack in case you have to cut and reconnect.

Now the "plotter porn"

Kamakazi Yellowtail!



Fatty Homeguard Dives on my Dropper.



Slug Halibut Stacked Like Pancakes!



Looks like WSB to me... what do you think?



School of YT breezing through mid column, out on the periphery of the cone.

I would have a few different interpretations on these.
Photo 1, I would agree with.
Photo 2, could be a YT, WSB or even a Sea Lion. I would go with what I caught or saw.
Photo 3, I would not guess Halibut unless you have your colorline very high. They are a demersal fish with no swim bladder and generally don't mark in hard colors (like many sharks and rays). I would guess YT or WSB.
Photo 4, By the thickness of the mark at that depth I would lean towards YT, but it could be a WSB.
Photo 5, By the depth and thickness of marks I would guess good sized Macks, Bonito or small YT.

Originally Posted by Dannowar

DORADO. YOU'RE BITTTTTTT




Open for interpretation....


Sent from my iPhone using Tapatalk

Photo 1, I can't pick out anything but bait in that pic.
Photo 2, The mark on the bottom appears to be a large fish, but I would bet it is a tightly grouped school of smaller fish. The broken edges of the mark over the entire length indicate that.

Originally Posted by Dirty Curti

Thanks for the thread. I have a few images I would like to share and get your opinion on what you see. I didn't catch any fish during these meter reads.

[IMG][/IMG]



[IMG][/IMG]



[IMG][/IMG]



[IMG][/IMG]

Thanks for any input.

Photo 1, Looks like a bait ball of either Spanish or Blacksmith (judging by individual mark size and coloring).
Photo 2, You are on the wrong frequency and over gained in that depth of water.
Photo 3, Mixed species school of bait, or could be some smaller predators among them.
Photo 4, That mark looks like a fish to me. I would guess that it is either a fish with no swim bladder or it is staying just outside of your transducer cone angle, or both.

Originally Posted by steveooo

What are these? Are they tasty?

















































*edit* chewy jacks

Perfect example of cone angle. The arches that are Red and solid are moving directly through the cone angle. The ones that remain blue and broken are outside the cone angle. The thickness of the bars, in the cone, are just the right size for the depth of water to match YT.

Originally Posted by Denis_Ruso

explain to me why I still cant get a bite

I can show you hours of video footage on fish not biting. Almost all of it can be attributed to a sluggish or oddly moving bait.

[chris138]

Originally Posted by GregAndrew

I would have a few different interpretations on these.
Photo 1, I would agree with.
Photo 2, could be a YT, WSB or even a Sea Lion. I would go with what I caught or saw.
Photo 3, I would not guess Halibut unless you have your colorline very high. They are a demersal fish with no swim bladder and generally don't mark in hard colors (like many sharks and rays). I would guess YT or WSB.
Photo 4, By the thickness of the mark at that depth I would lean towards YT, but it could be a WSB.
Photo 5, By the depth and thickness of marks I would guess good sized Macks, Bonito or small YT.


I can show you hours of video footage on fish not biting. Almost all of it can be attributed to a sluggish or oddly moving bait.

Hey Greg, thanks for chiming in! You have a very unique perspective of sonar returns, given your awesome video vantage. Most of the time when I claim a species, it's because I was bit on those marks. But not always...

I agree on #3, i happened to get a halibut at the time, however there were lots of YT around as well so you could be correct.

#2, Looks very much like a dog. But I got crushed by a 30# yt on that mark. I actually got the gopro footage of the mark, as it was diving then the bite on video. Edit will be coming...

#4, could be yellow but a little "wormy" for me. This was on a day when all three slam species were around.

#5 agree... could be boney. But a nearby friend caught yt right after so that was the basis of my assumption. And you are correct about them being smaller grade... 15-20#s.

Greg makes a great point here. The only time you know for sure what the mark was, is when you catch off the mark. The first time you do this, and watch the fish hit your bait, you will gain a profound sense of accomplishment and confidence!