— 145 — 
size, especially in the case of the whole weight. The gutted weights of the skrei lie between 
1% and 7—S8 kilos. The average weights of the skrei (corresponding to the size group 75—79 
cm.) lie between 2 and 2% kilos. The weights of the small fish are not easily discerned 
in the figure; the following table shows these more distinctly: 
Average weight in kilos for gutted small fish of different size groups, Barents Sea 1907. 
15-19 20-24 25-29 530-834 35-39 40-44 45-49 50-54 55-59 60-64 
0.02 0.05 0.08 0.16 0.25 0.38 0.54 0.82 0.83 1535 
Thus most of the young cod under 40 cm. are seen to fall below 2 hectogr. 
The 40—45 group approximately 4 hectogr. 
» 45—49 » » 5 » 
and the true loddefisk sizes lying between % and 1 kilos. 
The gutted weight also exhibits a variation according to season: thus the spent 
skrei lose more in the process of gutting than do the Finmark fish, which retained some 
67 %, whereas the gutted skrei only showed 60 %, or even 50 % of the whole weight. 
The fact that these low percentages are particularly noticeable among the small fish 
would seem to point to a certain regularity in the cause of the diminution; the spawning 
apparently occasioning a relatively greater loss of weight in the younger fish. 
Weight of the dried fish. 
In the fish trade, the relation between the gutted and dried weights of cod is ex- 
pressed by the general rule that one kilo of dried fish represents about 4—4Y, times 
that weight in fresh, gutted fish, equivalent to 6 kilos of fresh whole fish. 
The torfisk are sorted into certain classes according to weight, the principal 
being 
50—100 gr., 100—200 gr., 200—400 gr., 400—600 gr. and over 600 gr. 
In dealing with torfisk, it is useful to know what sizes of live or fresh fish correspond 
to these classes; in other words, what size groups they contain. This can be ascertained 
Fig. 94. Cod. a indicates measurement used in calculating original whole length from terfisk. 
a multiplied by abt. 1.5 gives the length of the fish. 
in two ways, either by multiplying the weight of the torfisk by 6, by which the approxi- 
mate whole weight is obtained, and then calculating the length according to the tables 
19 
