— 194 — 
| Lofoten 23. April 1913 | Finmarken 6. May 1913 
| 
| Average | Average Average | Average Average Average 
5cm. groups) weight of | weight of | ne | weight of weight jof ee 
fish, in kg. | liver, in gr. weight of fish) fish, in kg. | liver, in gr. weight of fish 
| 
50—54 Sa ae AR Fa + BR 
55—59 dao ai ass 1.5 47 3.0 
60-—64 1.6 27 1.9 1.8 63 3.4 
65—69 2.0 23 1.2 2.3 83 3.6 
70—74 2.2 44 2.0 3.0 110 38) 
75—79 2,9 60 2.0 3.5 130 4.3 
80—84 3.4 85 2.5 4.2 217 5.0 
85—89 4.3 124 3.0 5.1 331 6.4 
90— 94 5.6 200 3.5 5.9 350 6.0 
95—99 6.2 180 3.0 Br 
100—104 6.8 270 4.0 
105—109 8.6 400 4.6 
110—114 11.6 570 5.0 
115—119 15.0 890 5.6 
Whole 
sample .. 3.0 90 3.0 3.0 131 44 
opement of the genital products, whereas the Finmark fish had again commenced to 
store up a reserve of fat, taking advantage of the favourable conditions as regards nou- 
rishment afforded by the Finmark water, where the great shoals of capelan furnished 
an abundant supply of food. We find here the same changes in the course of nutritive 
assimilation which have previously been referred to when comparing the state of the 
spring herring with that of the large herring in point of fatness. 
Study of the influence of nourishment on the quantity of liver; necessary 
preliminaries. 
We arrive thus at the conclusion, that the size or weight of the liver is dependent 
both upon the size of the fish, and also on its conditions as regards nourishment. This 
being so, it is immediately evident that in this, as in any other case where two determining 
factors have to be reckoned with, an estimate of the respective influence of each factor 
can only be arrived at by the investigation of material furnishing definite information 
as to the independent effect of each. In considering the influence exerted by the size 
of the fish upon the weight of liver, it will be necessary to compare specimens of different 
sizes in the same condition as regards nourishment; in studying the effect of the last- 
named factor, specimens of equal size, but differing in point of nourishment, will be re- 
quired. In a sample of fish consisting of individuals all taken at one and the same 
place on one and the same day the average of the size groups may reasonably 
be taken (at any rate, in the case of grown fish) as being influenced in the 
same degree by the nourishment, and may therefore be used for purposes of 
comparison as regards the relation between the size of the fish and the weight of 
liver. On the other hand, examination of several different samples, arranged in such 
