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Fishery Bulletin 107(4) 
o 
Size classes (mm) 
Figure 5 
Size distribution (FL, mm) of wild chum salmon ( Oncorhynchus keta ) fry and 
early and late hatchery chum salmon fry caught by beach seine in littoral habitat 
in Taku Inlet, Alaska, during the outmigration period for wild fry (late April 
to mid-June): (A) inner inlet, 2004 (n = 510); (B) outer inlet, 2004 (n = l,037); 
(C) inner inlet, 2005 (?? = 625); and (D) outer inlet, 2005 (n = 2,379). 
inlet in both years (Fig. 7). Late and early hatchery fry 
had similar fork length distributions in the outer inlet in 
both years. For wild fry, mean length in the inner inlet 
increased significantly over time in both years (Fig. 8), 
from 39 to 49 mm FL in 2004 (P-0.05) and from 36 to 
47 mm FL in 2005 (PcO.Ol). In the outer inlet, mean 
length of wild fry increased significantly (PcO.Ol), from 
42 to 66 mm FL in 2004 and from 41 to 74 mm FL in 
2005. For early hatchery fry, mean length in the inner 
inlet increased significantly (PcO.Ol) from 54 to 62 mm 
FL in 2004, but sample size was too small for analysis 
in 2005. In the outer inlet, mean length of early hatch- 
ery fry increased significantly (PcO.Ol) in both years, 
from 53 to 69 mm FL in 2004 and from 59 to 67 mm 
FL in 2005. For late hatchery fry, mean length actu- 
ally decreased significantly (PcO.Ol) in 2004 from 71 to 
66 mm, but there was no significant change (P=0.56) in 
length in 2005 (Fig. 8). 
Comparisons of habitats In both years, wild chum 
salmon fry in neritic habitat were larger in the outer 
inlet than in the inner inlet and larger in neritic 
habitat than in littoral habitat (Fig. 9; ANOVA: 2004: 
PcO.Ol, P=84.7; 2005: PcO.Ol, P-139.7). As with 
wild fry, early hatchery fry in 2004 were larger as 
they shifted from littoral habitat to neritic habitat 
(ANOVA: PcO.Ol, P-19.4); no significant differences 
were observed in 2005. Too few early hatchery fry were 
sampled in the neritic habitat in the inner inlet in 2005 
to include in these analyses. In the outer inlet, fork 
length of late hatchery fry was significantly greater in 
neritic habitat than in littoral habitat in 2004 (i=1.97, 
