NYMPH-FLY FISHING 



you obtain a square which is sixteen times the 

 area of the given circle or square. So the square 

 of the girth of the fish divided by sixteen would 

 give the area of the section of the fish at its girth. 

 Multiply the area of this section by half his length, 

 the length of one wedge, and you have the cubic 

 volume of the fish. 



girth 2 X length 



= cubic volume 



16 2 



The specific gravity of a fish is about 1.15 so that 

 twenty-five cubic inches of fish weigh twenty-nine 

 of water, or one pound. So if you divide the 

 nimiber of cubic inches in a fish by twenty-five, 

 you will have his weight in pounds. The formula 

 becomes: 



girth ^ length 1 



X X — = weight in pounds 



16 2 25 



girth ' X length girth » X length 



16 X 2 X 25 800 



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