(Pennant, 1777) 
Individuals live for 3–5 years in groups in rocky crevices at depths of up to 40 metres (130 ft). Females grow faster than males, and the population is highly seasonal, with a pronounced peak in the autumn. They are preyed upon by a variety of fish, including species of Mullidae, Moronidae, Sparidae and Batrachoididae.
P. serratus may be distinguished from other species of shrimp by the rostrum, which curves upwards, is bifurcated at the tip and has 6–7 along its upper edge, and 4–5 teeth on the lower edge. Other speciesmay have a slightly curved rostrum, but then the teeth on its dorsal surface continue into the distal third, which is untoothed in P. serratus. P. serratus is pinkish brown, with reddish patterns, and is typically 100 millimetres (3.9 in) long, making it the largest of the native shrimp and prawns around the British Isles.
P. serratus is one of the few invertebrates to have its hearing studied in detail; it is sensitive to frequencies between 100 Hz and 3 kHz, with an acuity similar to that of generalist fish. While the hearing range of a P. serrratus individual changes as it grows, all are capable of hearing tones at 500 Hz.
A small commercial fishery exists for P. serratus on the west coast of Great Britain, chiefly in West Wales (Cemaes Head to the Llŷn Peninsula), but extending increasingly far north to include parts of Scotland. In Ireland, fishing for P. serratus began at Baltimore, County Cork in the 1970s and subsequently expanded. A peak landing of 548 t was recorded in 1999, and four counties account for over 90% of the catch — Galway, Kerry, Cork and Waterford. There is now concern that the current levels of exploitation may represent overfishing, and measures are being considered to limit the catch, such as a minimum landing size.
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