Multiyear evaluation of alewife (Alosa pseudoharengus) passage through fishways
About the Study
Through Passive Integrated Transponder (PIT) tagging of more than 5400 Alewives, we are calculating the attraction and passage efficiency for fishways of the Denil and pool and weir styles. We correlate successful attraction and passage with biological characteristics of fishes. Also, we provide new information on unmotivated migrants. Our data suggest that quantification of the number of migrants that are motivated to attempt passage of fishways, including an assessment of body size and sex, has implications for measures of true fishway attraction and passage efficiency for defining “effective fishways.”
Goals & Purpose
Our results are broadly applicable as the fishways studied are in use in many countries. Our results will enable engineers and managers who are designing fishways to predict the success of fishways of certain styles for Alewife passage.