Table 2.

Reproductive success (RS) comparison between hatchery and naturally spawned Chinook salmon. Rel RS is the mean RS of the hatchery fish divided by the mean RS the natural origin fish. I is the opportunity for selection (var/mean²). Sample sizes are contained in Table 1

		Hatchery RS		Natural RS		H + N pooled RS
Sex	Year	Mean	Var	Mean	Var	Mean	Var	I	Rel RS
Males	2003	0.738	3.32	1.06	4.06	0.833	3.50	5.04	0.699
	2004	2.84	9.25	4.00	38.7	3.24	18.7	1.78	0.711
	2005	0.739	1.93	0.821	2.45	0.784	2.17	3.53	0.900
	Pooled	1.21	4.94	1.46	10.2	1.31	7.01	4.06	0.829
Females	2003	1.80	3.96	2.50	6.30	2.06	4.60	1.08	0.720
	2004	5.47	13.8	3.71	10.2	4.91	12.8	0.533	1.47
	2005	5.00	28.7	2.42	6.99	3.06	12.2	1.30	2.07
	Pooled	4.14	14.3	2.80	7.42	3.52	11.3	0.917	1.48