FISHERY BULLETIN: VOL. 72, NO. 4 



STATION 30 1291 



REGRESSION OF NUMBER OF COD 



SALINITY 



N = 0.0111 • 0.0619D 



O5 DEPTH TO 



BOTTOM 



STATION 51 (501 



U 1.0 - ,0 



STATION 61 (621 



O2 



N = 1.1733  0.0271D 



U 2.0 



STATION 80 (811 



N - 1 .7130 • 0.0573D 



-J l_ 



10 20 30 10 



- 31.00 < 



20 30 



DEPTH (M 



Figure 2. — Depth distribution of juvenile Arctic cod and salinity at the 12 multidepth stations. Salinities from the nearest oceano- 

 graphic station (number in parentheses) from Ingham and Rutland (1972 ) and U.S. National Oceanographic Data Center. Numbers on 

 points indicate sequence of hauls. Regressions of number of cod (N) on depth in meters (D) fitted by least squares. Pooled slopes for all 

 data = 0.0669. 



Table 5. — Analysis of co variance on data for abundance and depth of juvenile 

 Arctic cod at 12 multidepth stations in eastern Chukchi Sea. 



Source 



d.i. SS. 



M.S. 



1. Individual regressions 23 



2. Difference between 1 and 3 

 for testing slopes 1 1 



3. Individual regressions fitted 

 with a common slope 34 



4. Difference between 3 and 5 

 for testing levels 11 



5. Regressions fitted to a 



single line 45 28.96030 



(2)/(1) = 0,79; n s. 



(4)/(3) = 13.49; P<0.005 



1098 



