Recently, Tom Betka, who is working with Larry Ramsell on developing a P.C. program that does weight calculations, notified me regarding some changes to the calculations. First of all Doug Hannon's formula has been modified more for Esox from the bass formula. Secondly, I credited Larry Ramsell with the formula, but I was told that Warren Wilkinson, a Canadian had developed the formula. Lastly, I was told of a new formula called the "Crawford Formula", which I have incorporated into my program. Big thanks to Tom Betka, for passing along this information. Tom was also nice enough to send me his beta program to do the calculations. It looks real good and will be Freeware when he releases it, so you might want to check it out.
I have put five different calculations for weight into this form. To
get all five calculations you must specify a length. If you have
only the length, then you will get only one calculation. The calculated
weight will be shown in both pounds and kilograms.
The Standard Calculation uses the formula weight
lbs. = girth inches * girth inches * (length inches / 800)
Warren Wilkinson thought the I.G.F.A. method was recording fish at to high a weight
so the calculation was modified: where weight
lbs. = (girth in. - .75) * (girth in. - .75) * (length / 800)
Casselman and Crossman based their formula on linear measurements taken from
341 trophy musky. Their formula is: weight(kg)
= 0.0000418 * ((length-cm * girth-cm)^1.441)
The Crawford Formula was done as part of a cliethrum project where some 700 fish were evaluated.
The formula is: Weight(lbs) = ((length-in * girth-in)/ 25) - 10
The last formula was developed by Doug Hannon and does not consider girth into
the equation: weight lbs = length^3 / 2800
Please indicate whether the dimensions you are entering are measure in inches or centimeters. The calculations will automatically convert the input values to the desired values for each calculation.
If you don't have a girth there is one formula that doesn't require it, which is Doug Hannon's pike formula.
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Last updated on ... March 16, 2006