Table 1. Sample sizes of introduced Mytilicola species in different sub-categories.

Host species	Parasite species	Sex	Dutch Delta	Wadden Sea	Total
Magallana gigas	M. orientalis	Males	22	31	53
		Females	24	32	56
Mytilus edulis	M. orientalis	Males	20	27	47
		Females	21	35	56
	M. intestinalis	Males	20	30	50
		Females	19	26	45
	Total		126	181	307