Fish arch Interpretations

[Hookup]

i suppose now that i think about it, i am wrong. my apologies gents. its the taper in the arches that reflect the density of the fish. i guess that would be why the arch is thickest in the middle.

OMG! I wast ticked... I honestly thought your last was just being funny... Sorry man, wasn't meaning to laugh at your idea... Twas my bad.

[moonshine]

well while i was man enough to admit i was wrong and apologize, your comment was exactly what i expected. just surprised you were the only one.

[CNs]

Presenter:
I have with me tonight Anne Elk. Mrs Anne
Miss Elk.

Miss Elk
Presenter:
You have a new theory about Fish.


Miss Elk:
Can I just say here Chris for one moment that I have a new theory about Fish?


Presenter:
Er... exactly.
 
What is it?


Miss Elk:
Where?
Presenter:
No, no. Your new theory.


Miss Elk:
Oh, what is my theory?


Presenter:
Yes.


Miss Elk:
Oh what is my theory that it is.
Well Chris you may well ask me what is my theory.


Presenter:
I am asking.


Miss Elk:
Good for you. My word yes.
Well Chris, what is it that it is - this theory of mine. Well, this is what it is - my theory that I have, that is to say, which is mine, is mine


Presenter:

Yes, I know it's yours, what is it?


Miss Elk:
Where? Oh, what is my theory? This is it.
(clears throat at some length)
My theory that belongs to me is as follows.
(clears throat at great length)
This is how it goes.
The next thing I"m going to say is my theory. Ready?


Presenter:
Yes!


Miss Elk:
My theory by A. Elk. Brackets Miss, brackets.
This theory goes as follows and begins now.

All Fish are Thin at one end, much thicker in the middle and then thin again at the far end. That is my theory, it is mine, and belongs to me and I own it, and what it is too.


Presenter:
That's it, is it?


Miss Elk:
Stop on, Chris.


Presenter:
Well, er, this theory of yours appears to have hit the nail on the head.


Miss Elk:
And it's mine.
Presenter:
Yes, thank you very much for coming along to the studio. Thank you.


Miss Elk:
My pleasure, Chris ....


Presenter:
Next week Quoyon's newest wasp farm ...


Miss Elk:
It's been a lot of fun.


Presenter:
Yes, thank you very much.


Miss Elk:
Saying what my theory is.


Presenter:
Yes, thank you.


Miss Elk:
And whose it is.


Presenter:
Yes, thank you - that's all - thank you... opens next week.


Miss Elk:
I have another theory.


Presenter:
Yes.


Miss Elk:
Called my second theory, or my theory number two.


Presenter:
Thank you. Quoyon's newest wasp farm...


Miss Elk:
This second theory which was the one that I had said...


Presenter:
(the phone rings; he answers)
Yes, no I'm trying...


Miss Elk:
Which I could expound without doubt.This second theory which, with the one which I just said, forms the brace of theories which I own and which belong to me, goes like this...


Presenter:
(looking at his shoe)
9 and a half, wide fitting... Balleys of Bond Street.
What? No, sort of brogue.


Miss Elk:
This is what it is.
(clears throat)


Presenter:
8 and a half.


Miss Elk:
This is it...
(lots of noisy throat clearing)

[plittle2]

Is anyone besides me still using a paper graph--I have been using a Lowrance x-15B for more than 25 year--cant beat the definition but the paper is getting expensive--was luckey to pick up 20 rolls dirt cheap off E bay.

[bm_attar]

Is anyone besides me still using a paper graph--I have been using a Lowrance x-15B for more than 25 year--cant beat the definition but the paper is getting expensive--was luckey to pick up 20 rolls dirt cheap off E bay.

I hope you are joking.

BM

[moonshine]

Is anyone besides me still using a paper graph--I have been using a Lowrance x-15B for more than 25 year--cant beat the definition but the paper is getting expensive--was luckey to pick up 20 rolls dirt cheap off E bay.

you are extremely lucky that it is still working. a buddy of mine had one and he loved it. it must be a full time job looking for the paper.

[Billy Bones]

Is anyone besides me still using a paper graph--I have been using a Lowrance x-15B for more than 25 year--cant beat the definition but the paper is getting expensive--was luckey to pick up 20 rolls dirt cheap off E bay.

Used a Raytheon paper graph in the mid 70's on Lake Michigan. At the time they were great but technology is so much better today.
Think you'd better upgrade, you're going to go broke buying paper.

Billy Bones

[Hookup]

If you are sitting still and see arches, then you are looking at debris or very small fish.

Hey MLR,
Not sure what you mean, but do you realize that you cannot determine size of the fish from the sonar display?

Photos like I posted earlier, have the fish moving through the dead center of the sonar cone which isn't always the case on the water.

Further, the diagram illustrates a 2d representation of the cone, which is infect a 3d object.

Finally, just for extra complexity, the diagram assumes the fish is at a constant depth and not moving vertically in the water column.

These are just a few of the variables that have to be considered when reading graphs on the water, and remember, the graph shows only the distance to the object, not depth, and the density/reflectiveness of the object. The rest is 100% up to interpretation.

[MLR]

Hook up

I should have wrote more detail. What I mean is that if you are sitting still jigging and see arches, it can be very deceiving. I have my chart speed turned up high and have found that fish will appear as a flat line on the screen. If I see an arch, its a very small fish. I have proven this to my self by lowering my jig head down into the cone and watched my jigging action on the screen, it creates an arch. So if a 1/4 ounce jig head creates an arch, then that tells me that an arch must be a small object. I guess thats why I switch over to a flasher if i am jigging.

Chart speed is very important too when reading the graph as it represents time in the cone.

So I say yes you can get a very good idea of the size of the object appearing on the screen if you take into consideration sensitivity setting, chart speed, boat speed and the arch shown.

[MLR]

Flasher Units I can fill you up with info on....graphs....not so much...

RJ

RJ

Hoping that a flasher seminar late fall / early winter is being planned.

[Climber2k]

Also size of the arch is NOT always indicative of the size of the fish.
A large fish moving at a speed opposite to the boat will make a smaller arch than the same size fish moving in the same direction as the boat. Due simply to the length of time it spends in the beam.

[RJ]

Flasher Units I can fill you up with info on....graphs....not so much...

RJ

RJ

Hoping that a flasher seminar late fall / early winter is being planned.

I do plan to do a few things this winter MLR...I'll be sure to keep you posted.

Thanks

RJ

[eye-tracker]

Arches are simply caused by a target moving into and out of the cone of a sonar signal. So variables like sonar direction, ping speed, scroll speed, boat speed, water density, and etc. can effect the return image.

Here is a very simple diagram that shows how a sonar returns an arch as the fish swims through the cone of the sonar or the transducer passes over the fish/target.



If you get a chance try to attend one of my Sonar Seminars during the winter months or please read this excellent sonar primer. If you spend the money on a sonar then try to spend a few hours understanding how they work so you get a better understanding of what is on the screen.

http://www.lowrance.com/Support/Tips-an ... -Tutorial/

-sheldon

[RJ]

See!....it's easy when a guy who lives and breathes electronics chimes in...

Well done Sheldon...even a guy from Prospect understood that explanation...


RJ

[eye-tracker]

Now RJ, you have to teach me what all those flashing LED lights mean on a Flasher...

-s