In Great Britain and/or Ireland:
Animal / parasite / endoparasite
Acanthocephalus clavula endoparasitises anterior intestine of Gasterosteus aculeatus

Animal / parasite / ectoparasite
Argulus foliaceus ectoparasitises scale of Gasterosteus aculeatus

Animal / parasite / ectoparasite
fluke of Dactylogyrus ectoparasitises skin of Gasterosteus aculeatus

Animal / parasite / endoparasite
metacercarium of Diplostomum endoparasitises vitreous humour of Gasterosteus aculeatus

Animal / parasite / endoparasite
metacaria (diplostomula) of Diplostomum gasterostei endoparasitises retina of Gasterosteus aculeatus
Other: major host/prey

Animal / parasite / endoparasite
Echinorhynchus clavula endoparasitises intestine of Gasterosteus aculeatus

Animal / parasite / ectoparasite
colony of Glugea anomala ectoparasitises white cysted skin of Gasterosteus aculeatus

Animal / parasite / ectoparasite
fluke of Gyrodactylus ectoparasitises skin of Gasterosteus aculeatus

Animal / parasite / ectoparasite
colony of Ichthyophthirius multifilis ectoparasitises white spotted skin of Gasterosteus aculeatus

Animal / parasite / endoparasite
Neoechinorhynchus rutili endoparasitises intestine of Gasterosteus aculeatus

Animal / parasite / ectoparasite
tapeworm of Proteocephalus filicollis ectoparasitises intestine of Gasterosteus aculeatus

Animal / parasite / ectoparasite
plerocercoid of Schistocephalus solidus ectoparasitises distended body cavity of Gasterosteus aculeatus

Animal / parasite / ectoparasite
colony of Trichodina ectoparasitises skin of Gasterosteus aculeatus
Other: minor host/prey