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QUESTIONS ABOUT MARINE-DERIVED NUTRIENTS AND C&R FISHERIES TO BE ANSWERED IN THE DISCUSSION

QUESTIONS ABOUT MARINE-DERIVED NUTRIENTS AND C&R FISHERIES TO BE ANSWERED IN THE DISCUSSION. Hal Michael Washington Department of Fish and Wildlife 360-902-2659 michahhm@dfw.wa.gov. QUESTIONS TO KEEP IN MIND. How can sufficient amount of MDN be delivered to a stream?

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QUESTIONS ABOUT MARINE-DERIVED NUTRIENTS AND C&R FISHERIES TO BE ANSWERED IN THE DISCUSSION

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  1. QUESTIONS ABOUT MARINE-DERIVED NUTRIENTS AND C&R FISHERIES TO BE ANSWERED IN THE DISCUSSION Hal Michael Washington Department of Fish and Wildlife 360-902-2659 michahhm@dfw.wa.gov

  2. QUESTIONS TO KEEP IN MIND • How can sufficient amount of MDN be delivered to a stream? • How can the differential effect of MDN on smolt age and productivity be modeled?

  3. Effect of nutrient addition on Keogh steelhead smolt ages

  4. Soos Creek Steelhead IIREMOVE LOW FLOW YEARS

  5. SALMON CREEK INCREASE IN LENGTH

  6. SNOW CREEK INCREASE IN LENGTH

  7. Comparison of various carcass biomass loading rates and 1998-2002 carcass loadings for the Skagit River. Loadings in kg/m² Watershed % provided Load Justification need min esc max esc reference 0.07 no growth increase 1,477,000 30.5% 159.8% Claeson (MS thesis.) 0.15 coho to coho 3,165,000 14.2% 74.6% Bilby et al. (2001) 0.63 enhance Keogh 13,300,000 3.4% 17.8% Ashley and Slaney (1997) 0.78 sockeye to insects 16,500,000 2.7% 14.3% Bilby et al. (2001) 1.9 system capacity 40,100,000 1.1% 5.9% Wipfli et al. (2003)

  8. Coho Sp Chin F Chin Chum TOTAL “ECOSYSTEM” GOAL-GRAYS HARBOR 634,342 66,314 761,577 12,692,956 TOTAL AT "NO EFFECTS" LEVEL OF LOADING 296,026 30,946 88,851 177,701 AVERAGE ESCAPEMENT 2001-2006 66,777 2,834 18,106 26,670 % OF "NO EFFECTS" LOAD 22.56% 9.16% 20.38% 15.01%

  9. MDN NUTRIENT RELATIONSHIPS WITH STEELHEAD • Increased MDN lowers smolt age • Lower smolt age gives higher smolt capacity for stream and productivity per female • Nutrients must be delivered to the parts of the system where there are rearing steelhead

  10. CATCH AND RELEASE CONCERNS • Does a C&R fish spawn in the same location, same fecundity, same survival to emergence, and same survival to repeat spawning as an uncaught fish? • What is the effect of being caught multiple times? • When is a fishery “too close” to spawning time? • Is C&R of kelts harmful?

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