Layer: Harbour Porpoise (ID: 5)

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Name: Harbour Porpoise

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Description: The harbour porpoise was a common inshore species found around the entire Irish coast and was observed from many headlands throughout the year (Berrow et al. 2010). In offshore areas, harbour porpoises occurred at highest densities in the Irish Sea and its northern and southern channels.The highest relative abundances were recorded in the western half of the central Irish Sea (figure 3).The 2005 SCANS II survey estimated a population of c.15,000 harbour porpoises in the Irish Sea, with a total estimate of 385,000 in Northwest European waters (Hammond et al. 2006). Harbour porpoises were less commonly encountered in offshore shelf waters of the Atlantic and Celtic Sea. This may partly be due to differing survey methods between the Irish Sea (where ferries were extensively used) and elsewhere (where research and naval vessels were used exclusively). It may also partly relsult from less favourable survey conditions in Atlantic waters as the detection rates for harbour porpoise decrease significantly in sea states greater than Beaufort 2 (Reid et al. 2003).

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Copyright Text: Irish Whale and Dolphin Group

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