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....not what I get out of it......
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From the section of the article you quoted in your post:
"The most accurate estimates (i.e., r2 values of 0.97 to 0.99) were derived using gutted weight, body volume (i.e., heart girth x head-body length) and heart girth."
I did make an error. The article says the heart girth measurement is one of the THREE most accurate measurements they used to estimate total body mass, not one of the TWO most accurate as I said in my earlier post. The three measurements were: gutted weight, body volume and heart girth.
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..but not accurate......my 2 cents
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Again, given that so far it's providing estimation errors of less than 5% (about 2% and 4% in the two examples given) it's going to be pretty tough to argue that it's not accurate.