Animal husbandry – Aquatic animal culturing – Fish culturing
Patent
1997-04-02
1998-03-24
Mancene, Gene
Animal husbandry
Aquatic animal culturing
Fish culturing
367139, A01K 6100, A01M 2902
Patent
active
057300860
ABSTRACT:
An improved fish deterrent and guide utilizing generally a pneumatic oscillator (1) and oscillated plate (9), to generate water particle motion (low frequency sound or infrasound) and specifically water particle accelerations to which fish exhibit an avoidance response. The invention is reliable, reasonably portable and deployable, low-maintenance, and tunable to produce the desired water particle motion. Reliability is due to the piston (4) being cushioned by air at the end of each stroke and redirected without impacting the casing. The operation of the apparatus is easily verified from the water surface by inspection of the backpressure regulator (13). The apparatus is tunable through adjustment of the inlet pressure, backpressure, and size, shape, and mass of the oscillated plate. Adjustment of these items through a lab and field testing procedure produce water particle motion with the correct frequency, amplitude, and energy to guide fish to a desired location or prevent their entrance into potentially dangerous areas.
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F.R. Knudsen, et al, Journal of Fish Biology, Awareness Reactions and Avoidance Responses to Sound In Juv. Atlantic Salmon (1992) 40 523-534.
F.R. Knudsen et al. Journal of Fish Biology, Avoidance Responses to Low Frequency Sound in Downstream Migrating Atlantic Salmon Smolt, (1994) 45 227-233.
G.T. Haymes et al, Can. J. Fish. Aquat. Sci., Exclusion of Adult Alewife Using Low-Frequency Sound for Application at Water Intakes (1986) 43 855-862.
Abbott Yvonne R.
Mancene Gene
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