Table 3

Table 3. Candidate experimental management, monitoring, and research activities to concurrently reduce key uncertainties and recover stocks (Marmorek et al. 1999). Activities with an asterisk were evaluated quantitatively (Peters et al. 2000).


Candidate approach	Experi- ment	Research/ monitoring	Possible survival effects	Hypothesis tested

1. Current hydrosystem operations/Measure D		X	none beyond current	D

2. Modify smolt transportation and Measure D*	X		post-BONN survival of transported fish	D

3. Transportation/no transportation*	X		direct passage survival; post-BONN survival of transported fish	D

4. Two-reservoir drawdown	X		passage survival; post-BONN survival; upstream survival	hydro

5. Four-reservoir drawdown*	X		passage survival; post-BONN survival; upstream survival	hydro

6. Carcass introductions/stream fertilization*	X		egg-to-smolt survival; other life stages	stock viability –nutrient

7. Manipulate hatchery production *	X		passage survival; post-BONN survival	stock viability–hatchery/disease

8. Predator removal	X		passage survival	hydro

9. Explore mechanisms for delayed mortality		X	none	D

10. Regime shift monitoring		X	none	regime shift

Notes: D is the ratio of estuary/ocean survival rate of transported fish : estuary/ocean survival rate of in-river (nontransported) fish. D < 1 indicates that transported fish have a lower estuary/ocean survival rate than in-river fish, whereas D > 1 indicates that transported fish have a higher estuary/ocean survival rate than in-river fish. See Appendix 3 for details.