Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
hitthebricks

Does Sonar scare fish?

Recommended Posts

hitthebricks

I was wondering if the pulse from a transducer scares the fish away. It seems to me that whenever I locate fish on a break or reef or where ever, after a very short while they have moved away from there. Would the sensativity setting also have a cause and effect with this? My tranducer also has dual freqencys, 200/83khz, what situations are they best suited for? HTB

Share this post


Link to post
Share on other sites
Big R

I don't think these units produce enough power to have any effect like that on fish. You must remember fish are always on the move they aren't going to stay in one place for long.

Share this post


Link to post
Share on other sites
Valv

This is an interesting question and I asked it too many years ago when FishingMinneosta.com was just born, in fact it was one of my first questions.

Anyway I believe (now) the clicking of the transducer does not scare fish, your propeller, boat shape, motor etc scare the fish more than sonar.

Share this post


Link to post
Share on other sites
Surface Tension

I don't think its scaring fish either. About the dual frequency ducer. Use the 200 kHz as your primary, it'll have much better resolution, definition of targets and bottom. The 83 kHz has a wider cone angle, will go deeper but you loose a lot of definition.

Trollers on Superior like the dual frequency because you can pick up downriggers weights that blow back with the lower kHz(wider cone angle) transducer. Typically you use them both on split screen.

Share this post


Link to post
Share on other sites
Dahitman44

Good points -- But I wonder if a vexilar or underwater camera can "spook" some fish in the winter. I have seen evidence both ways so I don't know.

Share this post


Link to post
Share on other sites
Jim Hudson

At times for certain species, I do believe the sonar can really wreak havoc on fishing...

For shallow water trout, especially through the ice, I believe a high ping output of a transducer can scare fish... Just an observation I have seen... As some ducers really ping hard and some have low output and do not have much or a pronounced ping...

Like I said, just an observation.. Nothing concrete...

Share this post


Link to post
Share on other sites
wishing for walleyes

A few years back taking 2 of my daughters bobber fishing in the boat,we fished a channel between 2 lakes.Every time a boat would come by we casted right behind him and the walleyes would bite then and only then.They liked the stirred up water.My daughters even got thier limits doing this.There was no current left in the channel as the water levels had went down.All of the walleyes were anout 2 #`s

Share this post


Link to post
Share on other sites
hitthebricks

I don't think of sonar as noise but as a pulse. If you hold your hand under the tranducer you can really feel the pulse as it moves. I guess that would be ping, when you turn up the sensativity, does it ping harder or faster? Another question is, didn't they crank the power all the way up on the sonar years ago in shallower water to scare the fish out to the planner boards when trolling. Thanks for the help! HTB

Share this post


Link to post
Share on other sites
BobT

I've wondered about this myself at times and I have come to believe that the hulking boat hull overhead is more likely to spook the fish than the pinging from the transducer. For sure, the pinging is about 10 times stronger through the water but that also means the fish hear it long before the boat gets there and they aren't running scared. It's when the boat goes overhead that the fish will tend to spread out or perhaps even scatter a bit. I believe that is why long line trolling and planer boards can be effective.

Bob

Share this post


Link to post
Share on other sites
Surface Tension

The gain/sensitivity doesn't change at the transducer, its a constant. When you turn up or down the gain you control the receiving end on the return ping.

Share this post


Link to post
Share on other sites
skunked_once

It didn't scare the ones I caught but it must have scared the ones that I didn't catch grin.gif

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  



  • Posts

    • EyeChsr
      was out tonight, 6-8 in out from the dnr landing. wheelers and a couple perms out. still open water out in front of Peters resort on the south shore. It starts out a couple hundred yards from shore and runs to the north- northwest for a long ways. some of the spots that were open earlier this week have skimmed, be careful out there if you see different looking ice stop and check!!
    • JIvers
      Thanks for the report--about what I figured, which is why I stayed down here in Iowa this weekend. I am fairly optimistic about getting on the ice in southeast or south central Minnesota next weekend; whether I am on a lake around Faribault or Waseca, or one of my old backwater haunts on the Mississippi remains to be seen. Maybe Clear Lake, Iowa. Whatever I do I will post my results.
    • JerkinLips
      9-11am was best time both days.
    • littlebear
      If you are willing to go a little further into Canada, I would recommend Hollinshead Resort, a few hours north of Thunder Bay.  The resort is the only one on the lake, and in June offers excellent Walleye Fishing, as well as some dandy Northern Pike.  It's somewhere you can drive to as well. 
    • monstermoose78
      Caught 20-23 gills and 6 crappies. Fun day on the 10 inches of ice. The whole lake was close to the same where I cut all the holes out and around
    • Wanderer
      I’m still seeing very random thicknesses all over.  In the past few days I’ve been from St. Cloud to Winnie and have seen vehicles on the ice and open water on the same lake. I’m in Little Falls.  Tonight I checked 2 lakes NW of town.  Both had people fishing.  One looked to be safe for wheeler travel and the other, very near it, still had an open lead and you could see the difference between the first sheet of ice and the second. I hope it doesn’t get covered with snow anytime soon so we can still tell where the changes are. Be safe. Bring floatation and picks.  And don’t drive yet! Ruh ro....
    • Bigfatbert
        Nice fish , great pics ,, what times of the day were best for you ?        
    • KidMoe
      I was on a small north metro lake today and found between 2.5 and 4 inches. One of the spud bar holes I punched started spewing water up so definitely needs a little more time. 
    • trebormorgan
      I was out on Round Lake last night (12/9/17) for the first time of the year. I was very surprised to see 12 inches of ice. I checked a few other holes and found anywhere from 11-12 inches. Keep in mind, I was about 300 yds out from the southeast shoreline. I’m not sure if it’s consistent across the middle of the lake. I only saw one group with a snowmobile. All other groups walked out, at least where was.  Anyone have any reports for ice thickness on other lakes in the area?
    • Billy G
      Alot of open water pockets on bigger lakes still, some people out on cannon on 3 inches about 60 yards or less from shore.