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Description:Current evidence indicates that the Harbor porpoise (Phoceana phoceana) population may be declining because of incidental take caused by sink-gillnet fishing in the Gulf of Maine. The acoustical signature of an open ocean sink-gillnet was compared to the hearing threshold of the harbor porpoise in this student project. Results suggest that the gillnet functions as an ambient noise modifier, increasing the intensity by 5-10 dB at low frequencies and decreasing the intensity at high frequencies. Since there were no obvious differences between the ambient and net noise trends, the harbor porpoise may be unable to distinguish the net from the regular ambient noise. More data are needed to determine the effects of a net holding fish.
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Sea Grant Document Number:NHU-T-93-003
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Rights Information:Public Domain
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