Responses of Blueback Herring to High-Frequency Sound and Implications for Reducing Entrainment at Hydropower Dams
- 1 November 1992
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 12 (4) , 667-683
- https://doi.org/10.1577/1548-8675(1992)012<0667:robhth>2.3.co;2
Abstract
Low- and high-frequency sounds were tested as a means of repelling blueback herring Alosa aestivalis in confined-area and open-water experiments. Confined-area tests were performed by analyzing the response of blueback herring in floating net-pens to sounds differing in frequency, sound pressure levels (SPLs, given in decibels [dB] in reference to l.0 μPa), and pulse width. Highfrequency sounds between 110 and 140 kHz, at SPLs above 180 dB (at 1.0 m from the transducer) and at various pulse widths, elicited statistically significant (P < 0.05) avoidance responses by blueback herring. A reduced response was observed at sound frequencies of 100 and 150 kHz. Low-frequency sounds between 0.1 and 1 kHz at SPLs of 160–175 dB (at 1.0 m from the transducer) elicited only short-term startle responses. Field tests were performed at Richard B. Russell Dam (on the Savannah River at the Georgia-South Carolina border) to evaluate candidate transducers and amplifiers. In field evaluations a single high-frequenc...Keywords
This publication has 0 references indexed in Scilit: