If you have the length, use the TPWD paper charts or the formula. It'll be as close as you can get. If you are unsure of the length, find something of a known length in the picture, and measuere using that as a scale. The buckle on the life vest would be perfect for this. Him many buckles long is the fish, then multiply that number by the length of the buckle in inches, voila!
Luckily he is holding the fish close to his body, so you don't have the aspect ratio thing to deal with.
Edited by David Burton (11/27/17 08:54 AM)
2015 Skeeter FX 21
...and down goes PhotoBucket with the new Terms of Service... I predict they will be out of business or begging for forgiveness inside a month. 6/30/2017