Abstract

Austropotamobius pallipes (Lereboullet) is the only crayfish species recorded from Ireland. Studies have concentrated on its distribution and feeding ecology, with a view to possible utilization of native stocks for aquaculture. Crayfish have been reported from all larger river systems with the exception of those in the acid sandstone south-west. The distribution pattern appears that of a native rather than an introduced species; headwater migrations may have helped in maintaining colonies in the low- lying midlands. Recent surveys indicate a reduction in range; since plague (Aphanomyces) has not been identified from Ireland, changes in distribution may be affected by factors such as habitat alteration, predation, or the microsporidian Thelohania. Preliminary food acceptance laboratory studies indicate a diverse potential diet. Individual reactions varied, but overall, of 16 aquatic and terrestrial invertebrate types offered, most were eaten except Corixidae. When a choice of foods was offered, amphipods were rejected. Submerged aquatic macrophytes (Elodea, Callitriche) were initially not accepted, nor were green terrestrial plants (Stellaria, Cramineae) although dead deciduous leaves were readily accepted. Further studies of natural diet in lakes and streams are in progress.

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