the killarney shad (or goureen) ("alosa fallax killarnensis") is a land-locked lake-dwelling sub-species of twaite shad, a mostly marine species. it is unique to the lakes of killarney. it is rarely seen because it feeds mainly on plankton and thus is rarely caught by fishers. it is listed in the irish "red data book" of threatened species. it is listed in annex ii of the eu habitats directive.