Susceptibility of Chinook Salmon Smolts to Bypass Systems at Hydroelectric Dams

Abstract

Several hydroelectric dams in the Snake-Columbia river system are equipped with submersible traveling screens that project into the turbine intakes. The screens are designed to divert juvenile migrant Pacific salmon Oncorhynchus spp. and steelhead Salmo gairdneri from the intake upward into gatewells and the ajoining central bypass system. Assays of gill Na+,K*-ATPase were performed on yearling chinook salmon O. tshawytscha collected during several routine fish guidance efficiency tests in 1985 and 1986. On three of the four sampling dates, gill Na*,K 4 -ATPase levels were significantly higher in fish guided into the gatewell than in those not guided. These data suggest there is a relationship between the physiological status of smelting yearling chinook salmon and their susceptibility to guidance by traveling screens. Assessments of salmonid out-migrations may be biased if they are based on samples from traveling-screen guidance systems.

Changes in gill Na+, K+ ‐ATPase specific activity during seaward migration of wild juvenile chinook salmon

“…Population estimates developed from the number of marked fish captured by seine would have greatly        overestimated the number of juvenile chinook salmon entering the ocean. A similar non-random capture of juvenile chinook salmon was reported by Giorgi et al (1988). They found that gill Na + , K + -ATPase activity decreased with sampling depth for juvenile chinook salmon trapped in front of a turbine intake at Lower Granite Dam on the Snake River.…”

Migratory delay leads to reduced passage success of Atlantic salmon smolts at a hydroelectric dam

“…activity) of the fish (Giorgi, Swan, Zaugg, Coley, & Barila, 1988;McCormick et al, 1999;Tétard, Lemaire, De Oliveira, & Martin, 2016). activity) of the fish (Giorgi, Swan, Zaugg, Coley, & Barila, 1988;McCormick et al, 1999;Tétard, Lemaire, De Oliveira, & Martin, 2016).…”

Effects of Transportation and Other Factors on Survival Estimates of Juvenile Salmonids in the Unimpounded Lower Columbia River

“…Physiological quality of juvenile salmonids varies widely among hatcheries, out-migration dates, and years (Dickhoff et al 1995;Beckman et al 2000). Seasonal changes in smoltification patterns, stress, disease, and energy usage (Giorgi et al 1988;Beckman et al 2000;Congleton et al 2000Congleton et al , 2005Schreck et al 2006) may contribute to this variation and affect migration behavior (Giorgi et al 1988;Clugston and Schreck 1992) and predator avoidance (Olla et al 1992(Olla et al , 1995Mesa et al 1994).…”