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Author Topic: Targeting Big Tuna  (Read 21931 times)

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Fishton

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Targeting Big Tuna
« on: November 26, 2010, 01:16:16 PM »
............................................
« Last Edit: February 21, 2011, 06:17:15 AM by Fishton »
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TUNAMAN

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Re: Targeting Big Tuna
« Reply #1 on: November 26, 2010, 01:44:26 PM »
This is a great example of what technology does for a person. Great post.
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Offline Capt. Hook

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Re: Targeting Big Tuna
« Reply #2 on: November 26, 2010, 07:38:04 PM »
Now structure scan is making sense, I was sure that it can do this but until now have not seen proof. I have however seen similar showings in even deeper water on a Furuno Sonar.
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Offline fedu

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Re: Targeting Big Tuna
« Reply #3 on: November 26, 2010, 11:27:18 PM »
 :hehe: :hehe:

I new it the moment Ken posted it I thought you were jumping in your chair.

Sidescan is a great feature I loved it when humminbird got out with it.
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Fishton

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Re: Targeting Big Tuna
« Reply #4 on: November 27, 2010, 06:17:46 AM »
SideScan range setting should be determined by the depth / water column that you are currently in, with a maximum of 100ft (even if you are in 600ft).  So if you are in lets say 40ft, your SS max range should be set to the same - 40ft.  I see Ken was using a SS range of 50 while his DownScan was on 150ft.   (clap)

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Offline fedu

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Re: Targeting Big Tuna
« Reply #5 on: November 27, 2010, 09:51:45 AM »
Quote from: Fishton on November 27, 2010, 06:17:46 AM
SideScan range setting should be determined by the depth / water column that you are currently in, with a maximum of 100ft (even if you are in 600ft).  So if you are in lets say 40ft, your SS max range should be set to the same - 40ft.  I see Ken was using a SS range of 50 while his DownScan was on 150ft.   (clap)

Could you explain because it does nor make sense to me.

If I am at 40ft range at 40ft ????  Then I will just be watching the water column!!!! Sorry can not understand what you are trying to say, please explain.
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Fishton

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Re: Targeting Big Tuna
« Reply #6 on: November 27, 2010, 12:16:13 PM »
Because the echo / return from a fish, especially a tuna is no where near as powerful as that of the sandy / rocky / coral bottom.   And if you are in water deeper than 30ft it is highly unlikely that you would see the sonic shadow.
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Fishton

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Re: Targeting Big Tuna
« Reply #7 on: November 28, 2010, 06:16:38 PM »
Did this not make sense either Fedu?
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Offline fedu

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Re: Targeting Big Tuna
« Reply #8 on: November 28, 2010, 06:22:10 PM »
A bit, but as long as you compensate with the gain wouldn't it be the same ?

On the pic I posted previously that would mean "only" seeing this.....
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Offline fedu

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Re: Targeting Big Tuna
« Reply #9 on: November 28, 2010, 06:24:26 PM »
Instead of this.
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Offline jaenswart

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Re: Targeting Big Tuna
« Reply #10 on: November 28, 2010, 06:40:21 PM »
Quote from: fedu on November 27, 2010, 09:51:45 AM
Could you explain because it does nor make sense to me.

If I am at 40ft range at 40ft ????  Then I will just be watching the water column!!!! Sorry can not understand what you are trying to say, please explain.

Fishton mean that if the water is 40 meter deep you should set you side scan to 40 meters to the side of the boat. the same as the water depth
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Offline fedu

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Re: Targeting Big Tuna
« Reply #11 on: November 28, 2010, 07:26:17 PM »
Quote from: jaenswart on November 28, 2010, 06:40:21 PM
Fishton mean that if the water is 40 meter deep you should set you side scan to 40 meters to the side of the boat. the same as the water depth

Again instead of seeing the 1st picture I would only see the 2nd....
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Fishton

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Re: Targeting Big Tuna
« Reply #12 on: November 28, 2010, 08:45:37 PM »
100% Fedu,

If you were looking for wrecks in shallow water, or if you were using a towfish in deeper water, then the range setting above will be perfect.

But if you were looking for tuna for example then no, water column only.
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Fishton

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Re: Targeting Big Tuna
« Reply #13 on: November 28, 2010, 08:46:53 PM »
Quote from: jaenswart on November 28, 2010, 06:40:21 PM
Fishton mean that if the water is 40 meter deep you should set you side scan to 40 meters to the side of the boat. the same as the water depth

Yes, that's right jaenswart.
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benniejordaan

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Re: Targeting Big Tuna
« Reply #14 on: November 30, 2010, 12:01:49 AM »
BUT

In the sounder showing on the left, he has the range at 150 feet. On the right (structure scan) the range is at 50 feet. On the left he clearly has the noise rejection set way too high. Which is why he is getting a poor showing on the left. Should he have had his sounder set up right, he would have seen the bait and the fish. And it too would have "found the big tuna".

Clearly a bias comparison.
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Offline fedu

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Re: Targeting Big Tuna
« Reply #15 on: November 30, 2010, 12:13:48 AM »
Fish and structure showing at the humminbird sidescan with range greater than depth....
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Offline fedu

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Re: Targeting Big Tuna
« Reply #16 on: November 30, 2010, 12:17:32 AM »
first pic a single fish and second a whole lot, range > depth
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Fishton

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Re: Targeting Big Tuna
« Reply #17 on: November 30, 2010, 04:36:15 AM »
Quote from: benniejordaan on November 30, 2010, 12:01:49 AM
BUT -   ?

In the sounder showing on the left, he has the range at 150 feet.  100%

On the right (structure scan) the range is at 50 feet.  100%

On the left he clearly has the noise rejection set way too high.   Or gain too low.

Which is why he is getting a poor showing on the left.   100%

Should he have had his sounder set up right, he would have seen the bait and the fish. And it too would have "found the big tuna".  Not if the school was not DIRECTLY beneath the boat, which this school is clearly not.

Clearly a bias comparison.  -  ?

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Fishton

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Re: Targeting Big Tuna
« Reply #18 on: November 30, 2010, 04:45:09 AM »
Quote from: fedu on November 30, 2010, 12:13:48 AM
Fish and structure showing at the humminbird sidescan with range greater than depth....

If tuna could be found at a depth of 5.4m, and if they had large swim bladders (as these fish clearly do) - then yes, a SideScan range of far more than your current depth would be a great setting.
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Fishton

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Re: Targeting Big Tuna
« Reply #19 on: November 30, 2010, 04:46:59 AM »
Quote from: fedu on November 30, 2010, 12:13:48 AM
Fish and structure showing at the humminbird sidescan with range greater than depth....

This is a great example of SideScan range setting as you get into deeper water ...
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