442 
Fishery Bulletin 107(4) 
Size classes (mm) 
Figure 7 
Size distribution (FL, mm) for chum salmon (Oncorhynchus keta) fry caught 
by Kodiak trawl in neritic habitat in Taku Inlet, Alaska, during the outmi- 
gration period for wild fry (late April to mid-June) by year: (A) inner inlet, 
2004 (n = 32); (B) outer inlet, 2004 (n = 273); (C) inner inlet, 2005 (n = 30); 
and (D) outer inlet, 2005 (n = l,006). 
tended to be warmer in 2005 than in 2004, particularly 
after early hatchery fry were released. Salinity was 
also greater in the outer inlet than in the inner inlet 
in both littoral and neritic habitats. Salinity generally 
declined from 30 to 15 from April through mid-May 
in the outer inlet and remained relatively constant 
through the end of the season in both years, whereas 
in the inner inlet salinity declined from 15 to 5 over 
the same period. 
Because of the small sample of wild chum salmon 
in neritic trawls, regression analysis of abundance, 
size, and condition of wild fish was limited to littoral 
habitats. In general, wild fry were more abundant and 
individuals were larger than hatchery fry. Abundance 
of wild fry was positively related to the abundance of 
hatchery fry in the inner inlet in 2004 and in the outer 
inlet in both years (Table 1). Abundance of wild fry 
was not related to salinity or sea surface temperature 
in either year. 
Size (wet weight) of wild fry in the inner inlet was 
positively correlated with abundance of both wild and 
hatchery fry in 2004, but weight was negatively corre- 
lated with the abundance of wild fry and not correlated 
with the abundance of hatchery fry in 2005 (Table 2). 
Multiple regression analyses indicated that both wild 
and hatchery fry abundances were significant variables 
explaining the variation in weight in 2004; in 2005, 
neither parameter was significant when time (date) 
was included in the model (Table 2). Temperature was 
positively correlated with weight in both years but was 
not significant in the multiple regression models. 
Weight of wild fry in the outer inlet was not cor- 
related with either hatchery or wild fry abundance in 
2004; only date was significant in the multiple regres- 
sion analysis for the year (Table 2). In 2005, weight was 
negatively correlated with wild fry abundance and not 
correlated with hatchery fry abundance. However, when 
date was included in the multiple regression model. 
