Greinar (Vísindafélag Íslendinga) - 01.01.1943, Qupperneq 198

194
Table 3. The Number of Vertebrae in the Icelandic Capelin.
Vert. Keflav. Apr. lst 1938 Hvalfj. Apr 1939 2nd Combined.
9 9 S S Tot. 9 9 s s Tot. 9 9 s s Tot.
72 2 3 5 1 1 3 3 6
71 65 8 73 20 1 21 85 9 94
70 177 15 192 53 4 57 230 19 249
69 215 18 233 92 2 94 307 20 327
68 53 5 58 27 1 28 80 6 86
67 5 1 6 4 4 9 1 10
66 1 1 1 1
N 517 51 568 197 8 205 714 59 773
M 69.484 69.588 69.493 69.310 69.625 69.322 69.436 69.593 69.448
m+ 0.039 0.170 0.039 0.066 0.331 0.064 0.034 0.152 0.033
Mi-Ma 0.114 0.315 0.157
j/n?+nl 0.174 0.337 0.156
As shown' in the table, the average number of vertebrae
(M) is 69.448 ± 0.033 for the whole material, but it
should be noted that the number was somewhat higher
(69.493) in the Keflavík sample 1938 than in the Hvalfj.
sample 1939 (69.322). This must be due to a somewhat
varying number of vertebrae in different year-broods, a)
as we in both cases have to do with spent animals1) and
b) as the III-group is by far the most numerous on the
spawning grounds, as stated above, so that the 1935-year-
brood was predominant in 1938, but the 1936-brood in
1939. Further we find a slight difference in the number
of vertebrae in the sexes, the number in the males ex-
ceeding that in females by 0.114 in the Keflav., 0.315 in
the Hvalf. and 0.157 in the combined material. As shown
in the table the standard deviation in the combined ma-
1) The Hvalfj.-material was exclusively composed of spent indi-
viduals.