Crockford: Archeological evidence of Thunnus thynnus off British Columbia and northern Washington 
17 
Table 3 
Regression analysis values: log of vertebral lengths, GL, and proximal breadth, GB(p), vs. log of skeletal length, SL, of 4 modern 
bluefin specimens (USNM 269001, 269004, 268964, 269002). NA = not applicable. Number of observations=4 (*=3); Degrees of 
freedom =2 (*= 1 ). 
Vertebra no. 
Constant 
GL 
X Coefficient 
GL 
r value 
GL 
Constant 
GB(p) 
X Coefficient 
GB(p) 
r value 
GB(p) 
1 
4.8553 
0.7814 
0.903 
NA 
NA 
NA 
2 
4.6692 
0.8328 
0.881 
3.8396 
0.9154 
0.892 
3 
4.4210 
0.9155 
0.917 
4.0180 
0.8634 
0.945 
4 
4.6286 
0.8486 
0.901 
4.4710 
0.7433 
0.965 
5 
5.2932 
0.6351 
0.908 
4.5377 
0.7295 
0.997 
6 
4.9966 
0.7257 
0.933 
4.6478 
0.7096 
0.981 
7 
4.2052 
0.9593 
0.992 
4.3649 
0.8043 
0.970 
8 
4.1994 
0.9492 
0.932 
4.0022 
0.9111 
0.970 
9 
4.6598 
0.8064 
0.955 
3.9509 
0.9272 
0.985 
10 
4.7950 
0.7543 
0.928 
3.9373 
0.9300 
0.994 
11 
3.9914 
0.9810 
0.993 
3.8234 
0.9561 
0.996 
12 
5.3210 
0.5964 
0.908 
4.2293 
0.8463 
0.985 
13 
4.6473 
0.7785 
0.971 
4.3599 
0.8081 
0.994 
14 
4.4486 
0.8287 
0.983 
4.0404 
0.8918 
0.992 
15 
4.5968 
0.7815 
0.954 
4.4404 
0.7807 
0.988 
16 
4.6118 
0.7746 
0.991 
4.4515 
0.7768 
0.986 
17 
4.2226 
0.8808 
0.972 
4.3918 
0.7903 
0.989 
18 
3.5879 
1.0526 
0.962 
4.3059* 
0.8088* 
1.000 
19 
4.3551 
0.8328 
0.997 
4.2695 
0.8175 
0.988 
20 
4.3449 
0.8360 
0.994 
4.4124 
0.7797 
0.983 
21 
4.1621 
0.8809 
0.985 
4.3422 
0.7963 
0.987 
22 
4.2308 
0.8604 
0.987 
4.2783 
0.8129 
0.991 
23 
5. 1630* 
0.5922* 
0.705 
NA 
NA 
NA 
24 
4.3756 
0.8189 
0.987 
4.4521 
0.7663 
0.989 
25 
4.2320 
0.8561 
0.989 
4.1347 
0.8494 
0.988 
26 
4.0288 
0.9085 
0.997 
4.2699 
0.8127 
0.975 
27 
3.8883 
0.9387 
0.995 
4.4668 
0.7626 
0.984 
28 
3.8464 
0.9475 
0.996 
3.9946 
0.8854 
0.993 
29 
3.4217 
1.0551 
0.976 
4.1875 
0.8305 
0.979 
30 
4.0737 
0.8741 
0.937 
4.1472 
0.8386 
0.999 
31 
3.6730 
0.9715 
0.886 
NA 
NA 
NA 
32 
4.0061 
0.8852 
0.876 
NA 
NA 
NA 
33 
4.5576 
0.7398 
0.859 
3.7206 
0.9430 
0.995 
34 
5.1867 
0.5850 
0.598 
3.9220 
0.9076 
0.998 
35 
5.6621 
0.4777 
0.595 
4.3345 
0.8317 
0.976 
36 
5.3978 
0.5952 
0.942 
5.8817* 
0.4347* 
0.713 
37 
5.7937 
0.6068 
0.921 
3.5138 
1.1630 
0.990 
38 
6.2246 
0.5138 
0.862 
3.1768 
1.3458 
0.988 
39 
3.7247 
0.9270 
0.901 
4.5084 
0.9313 
1.000 
intervertebral cartilage [20 cm] and flesh on the snout 
and tail [10 cm]). Weight estimates have been calcu- 
lated from the formula derived by Foreman and 
Ishizuka ( 1990) for large Pacific bluefin and are pre- 
sented in Table 5. 
Age estimations included in Tables 5 and 6 are 
compiled from data presented by Bayliff (1994) that 
was based on fork-length estimates. However, Hales 
and Reitz (1992) cautioned that age data determined 
from modern population samples may differ from 
prehistoric populations. They report a distinct change 
in growth rates over time for Atlantic croaker, 
Micropogonias undulatus (Perciformes: Sciaenidae), 
from Florida, a change determined from the analy- 
sis of otolith growth increments from prehistoric 
samples. Compared with modern populations, croak- 
ers from populations of several centuries ago grew 
more slowly and lived much longer. 
