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General => General Topwater & Jigging Discussion => Topic started by: Anthony Dimech on November 30, 2015, 08:37:32 AM

Title: GT/Dogtooth Length to Weight
Post by: Anthony Dimech on November 30, 2015, 08:37:32 AM

Hi all,

I used to have a good chart for GT/Dogtooth length to weight conversions, but buggered if I can find it.

Anyone have any reference information that can be used as a general guide?

Thanks in advance.

Title: Re: GT/Dogtooth Length to Weight
Post by: Robert Woll on November 30, 2015, 11:31:06 PM

Here's a formula for estimating the weight of a dogtooth tuna. It has been suggested by Julien Derozier in  "Partir Pecher" nr. 36 (September 2013).

C = circumference (measured at the thickest point of the fish) in inches
L = length (measured only to the fork of the fin, i.e. the "shortest length") in inches
W = calculated weight in lbs

W = C x C x L : 800

The weight in kilos is     W x 0,453.

Let's see who can confirm.
 

Title: Re: GT/Dogtooth Length to Weight
Post by: Anthony Dimech on December 01, 2015, 08:26:25 AM

After lots of trawling, found this also:

Dogtooth:

W=0.0105L 3.065

GT:

GT up to 30 KG and over: (girth x girth x fork length x 2.74) / 100000
GT of 40 KG and over: (girth x girth x fork length x 2.70) / 100000
GT of 50 kg and over: (girth x girth x fork length x 2.60) / 100000

Some people along the coast apply a different formula for any fish size:
(girth x girth x fork length x 3.46) / 100000