Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 328113
Title The influence of three acoustic alarms on the behaviour of harbour porpoises (Phocoena phocoena) in a floating pen
Author(s) Kastelein, R.A.; Haan, D. de; Vaughan, N.; Staal, C.; Schooneman, N.M.
Source Marine Environmental Research 52 (2001). - ISSN 0141-1136 - p. 351 - 371.
DOI http://dx.doi.org/10.1016/S0141-1136(01)00090-3
Department(s) Netherlands Institute for Fisheries Research
Publication type Refereed Article in a scientific journal
Publication year 2001
Abstract Harbour porpoise bycatch may be reduced by deterring porpoises from nets acoustically. In this study, two harbour porpoises were subjected to three acoustic alarms. The effect of each alarm was judged by comparing the animals' position and respiration rate during a test period with that during a baseline period. The XP-10 alarm produced 0.3 s tonal signals randomly selected from a set of 16 with fundamental frequencies between 9 and 15 kHz, with a constant pulse interval of 4.8 s (duty cycle 6Ž The 2MP alarm produced 0.3 s tonal signals randomly selected from a set of 16 with similar fundamental frequencies but with random pulse intervals of between 2 and 5 s (duty cycle 8Ž The frequency spectra and source levels of the 2MP and XP-10 alarms varied depending on the signal selected. The HS20-80 alarm produced a constant, but asymmetrical frequency modulated sinewave between 20 and 80 kHz with total pulse duration of 0.3 s, with random pulse intervals of between 2 and 5 s (duty cycle 4.6Ž The porpoises reacted to all three alarms by swimming away from them and by increasing their respiration rate. The XP-10, which on average had the highest source level, had the strongest effect.
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