Topic: is this an image of bass

[Prdbrissy]

Hi Guy's

I am new at trying to understand my side image images.
This is an image from my local bass lake.
can someone that undestands these things explain what I am looking at.


many thanks
regards to all

[calli1]

Yes...this could be Bass...but could also be large Shad.  Either way...you get the idea what the fish will look like.  I find that the bass are a little more scattered in nature and not as grouped up so to speak.

[Bob B]

I don't know what all your native species are in Australia, but this is definitely a large school of fish... If it were around here I would think it might be a large school of white bass.  from the shadows, looks like they fish are a lot bigger than bait fish.

I have seen scans of large schools of gar that look a lot like that.

[Prdbrissy]

Bob B
This image is from a dam that is stocked with Australian native bass( they look very much like your small mouth bass) there is also a large population of native catfish that are about the same size of fish as our bass. Both these fish form schools in our winter.
I am particular interested in comments on the down image and the sonar image which don't seen to correlate with each other.

[lcookie]

Looks like your switchfire may be be set to clear mode.  If so change to max mode.

[rnvinc]

The DI image in your 798 is a computer generated rendering from the data received in the SI xducer elements...

This is why the DI image more correlates to the image you see in the SI image....and not the 2d....
(The DI rendering and the 2d rendering are coming from 2 completely separate and individual shaped sonar beams)...

Rickie

[Humminbird_Greg]

And because of those differently shaped sonar beams and because sonar shows you distance from the transducer; we can deduce that the school of fish are spread out more horizontally in the water column than vertically.  If the school was vertically thicker it would have shown vertically thicker in the 2D sonar.  The fact that the fish are shown only 2 to 3 feet away from the transducer in the 2D sonar yet up to 10 feet away from the transducer in the Si and Di sonar indicate that they are more spread out like a pancake rather than in a ball shape.  Does that help indicate one species of fish versus another?

It also looks like the school was moving either from the left to right of right to left of the boat (I get this from the elongated sonar returns and shadows of what look like individual fish) or they could have just been longer fish pointed in the left-right direction.