Juvenile Alewife, conducted with Kleinschmidt Associates, Fall 2021

Study Overview
55 cm diameter RHT at 7 m head, 541 rpm
3 treatment and 2 control groups, (484 turbine-passed fish)
Juvenile Alewife, 87-132 mm length
99-100% immediate and 48h survival of turbine-passed fish

Alosines (shad and river herrings) are an important and highly sensitive group of migratory fish species affected by hydropower and river fragmentation in eastern North America. Juvenile alewife (Alosa pseudoharengus) passage survival through a 55 cm RHT was evaluated at Freedom Falls, Maine, in September 2021 with assistance from Kleinschmidt Associates.

Downstream migrating juveniles were collected locally and passed through the turbine in groups, and collected at the outlet with a specialized trap. Turbine passage was observed with high-speed video, and turbine passage survival rates were compared to control group survival. This work is summarized in a journal article manuscript currently under review.