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.
The male guards and fans the eggs, and later broods the young for a short time. Rock Bass grow quickly and adults weigh and average of 4 to 8 ounces. An average length is six to 8 inches, although some Rock Bass reach 12 inches. Few Rock Bass live beyond 10 to 12 years. Large bass, Northern Pike, Muskellunge, and perhaps Walleye prey on young Rock Bass.