Translation Series No.1211

found can be used for the recalculation.
- 117-
Fig. 29 shows, as was to be expected, that a linear relation
• exists that leads through the use of the method of least squares to
W = -0.0241 + 0 .91 80 lélf
Wf = 0.0263 + 1.0 893 Wg.
Here W is the gutted weight and Wf is the fresh weight. The
straight line does not pass exactly through the origin, but cuts the neg-
ative abscissa. To be sure, we must expect this result, because one could
'already speak of gutted weight'in case of an embryo, as soon as the ento-
derm has been organized. The additive term, however, makes difficult the
recalculation. We shall therefore examine how large is the error when we
omit the additive constant and alter the slope constant correspondingly.
The'equation then becomes
W = 0.9114 Wf
WÉ = 1.0972 Wg .
Compared with the first equation, the recalculation from fresh
weight to gutted weight results in an error of + 1.96 per cent for a fresh
[1).- 298]
weight of 1 kg, -0.20 per cent for a fresh weight of 5 kg, and -0.46 per
cent for a fresh veight of 10 kg. The difference is thus largest for the
'smaller salmon. For body weights between 1.6 and 20 kg the error lies below
1 per cent, for those between 2 and 10 kg even under 0.6 per cent. On the
fish markets the weight of salmon is given in the great majority of cases
only within 100 g. This means that the error for these figures is generally
higher than 1 per cent and is higher than 2 per cent for small fish. It is
therefore justified for single recalculations to make use of the above
simplified . relation and.to neglect the additive constant. One can proceed thus
-Fresh weight = gutted weight + 9.72 per cent
Gutted weight = fresh weight - 8.86 per cent.