28.5-inch fish is 724mm.
29-inch fish is 737mm.
The chart would estimate the weights at over 4000 grams, which is 8.8-lbs or more!
As you can see, the regression line for river fish and lake fish doesn’t even extend that far, because fish of that size are not a significant part of our sampling data. We just don’t see fish that big!
This data is from the USFWS

