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Formulas for Estimating Fish Weight

April 17, 2005 By: Marshall Cutchin

Marty Seldon recently reposted formulas for estimating fish weight on Dan Blanton’s bulletin board. In summary the number used for dividing into the total of Length X Girth squared to get the estimated weight is 800 for large-girthed fish, 900 for slender fish — implying that a fatter fish should get a weight “bonus.” Still not sure how accurate the results are for various species, or what the margin of error might be.