516 
Fishery Bulletin 95(3), 1997 
and then to move into shallow water as age-0 juve- 
niles (Gibson, 1973; Lockwood, 1974; Tanaka et al., 
1989). In prior studies (Gibson, 1994) as well as this 
one, depth and its effect on water temperature may 
play an important part in determining distribution 
of juveniles. Water temperature affects growth and 
Yellowfin sole 
depth <28 m 
G,M,S,gS,msG,sG 
gM,gmS,mG,mS,sWI 
>28 m 
0.16 
(69) 
0.60 
(47) 
distance <32 km 
>32 km 
2.05 4.25 
(47) (6) 
Node 
Figure 8 
Pruned regression tree for age-1 yellowfin sole with predictions of log(CPUE+l) at each terminal 
node, and number of stations in parentheses (top figure). Bottom figure contains box plots of 
log(CPUE+l) by terminal node. Each box plot summarizes distribution of CPIJE at stations rep- 
resented by the terminal node directly above it. Box plots indicate median (filled circle), 
interquartile range (box height), and outliers (open circles). Whiskers indicate upper quartile 
plus 1.5 times interquartile range and lower quartile minus 1.5 times interquartile range. Width 
of boxes is proportional to square root of number of stations at that node. See text for sediment 
abbreviations. 
