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Reload this Page Estimating Tuna Size

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Old 06-14-2007, 01:03 PM   #1
big jay
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Estimating Tuna Size
Thought I would put this formula out there, since there is always alot of back and forth on sizes of fish - especially when your dealing with fish (hopefully) that are too big for the tackle shop scale.

(Length X Girth X Girth) / 800 = fish weight

This should give you the weight within 10%. This is especially effective on tuna, as they don't normally have any funky shapes (like a protruding belly on a big bass).

This is a straight line measurement for the lenght, not a curved, so you would not use a flexible tape for the length, but you would use one for the girth.


Hope there are lots of sushi parties for everyone this year!
Last edited by big jay; 06-14-2007 at 01:48 PM..
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Old 06-14-2007, 06:50 PM   #2
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Hey there you are.......do you have any in the boat yet?

That looks useful, thanks for the formula.
boatless................can I have a ride?
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Old 06-14-2007, 08:24 PM   #3
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Hey Jon.
No tuna trips yet - ran some Cod trips and now we're doing well with the Bass.
I was going to go up there and look around today, but unfortunately Blown out (obviously).
All Bass this weekend, but might go Tuesday or Wednesday - may as well rig some of the macs I put up in the freezer.
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Old 06-15-2007, 06:50 AM   #4
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That's the formula they use for marlin, not sure its that accurate for tuna.
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Old 06-15-2007, 04:48 PM   #5
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I'm sure Jay wouldn't post the formula on here if it wasn't accurate (to about 10%). Try it out this year and let us know if the formula actually works....
Ed
"I caught you a delicious Bass."-Napolean Dynamite
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Old 06-15-2007, 06:24 PM   #6
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Jay, do you rig the macks like you would with a hoo? Do you brine them before the freeze because I have a dozen or so that could use some rigging also.
boatless................can I have a ride?
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Old 06-17-2007, 07:22 PM   #7
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ummmm yeah, that's the correct formula.

Tajon - email me sometime. I'm beat from fishing and I don't feel like dealing...
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Old 06-19-2007, 05:12 PM   #8
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Ol' skippers used to call that hanging out your laundry
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Old 06-20-2007, 07:40 AM   #9
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https://hmspermits.noaa.gov/other/BFTsizeclass.doc

Size Class Categories of Atlantic Bluefin Tuna

CURVED PECTORAL FIN APPROX.
SIZE FORK CURVED ROUND
CLASS LENGTH FORK LENGTH WEIGHT

Young school <27 " <20 " <14 lbs

School 27 - <47 " 20 - <35 " 14 - <66 lbs

Large School 47 - <59 " 35 - <44 " 66 - <135 lbs

Small Medium 59 - <73 " 44 - <54 " 135 - <235 lbs

Large Medium 73 - <81 " 54 - <60 " 235 - <310 lbs

Giant 81 " or > 60 " or > 310 lbs or >
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