The Water Resources Division's Surface Water Assessment Section oversees the protection of the quality of surface waters throughout the State of Michigan.
WEIGHT = 4.09 pounds Largemouth Bass Weight. The formula to calculate the weight for a Largemouth Bass that is 20 inches long and has a girth of 15 inches is as follows. Largemouth Bass have a shape factor of 1050. WEIGHT = LENGTH x GIRTH2 / SHAPE FACTOR. WEIGHT= 20 x (152) / 1050.
Here are a few other fish facts in regards to largemouths: 1  The average length of a one-year-old largemouth bass varies from about 2 to 8 inches. They can reach nine to 10 inches in the second year, but itâs usually in the third year. 2  Largemouth bass eggs hatch in two days at 72 degrees F. or five days at 66 degrees F.