The helminth fauna of brown trout (Salmo trutta) from a sub-alpine lake revisited after 40 years with introduced European minnow (Phoxinus phoxinus) Author Borgstrøm, Reidar Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003 NMBU, NO- 1432 Ås, Norway Author Mestrand, Øyvind Hatleli Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, PO Box 5003 NMBU, NO- 1432 Ås, Norway Author Brittain, John E. Natural History Museum, University of Oslo, PO Box 1172 Blindern, NO- 0318 Oslo, Norway Author Lien, Leif Vollsveien 62, NO- 1358 Jar, Norway text Fauna norvegica 2021 2021-05-27 41 15 26 https://doi.org/10.5324/fn.v41i0.3952 journal article 312116 10.5324/fn.v41i0.3952 13a2e256-da0e-4f1e-9d5f-379c05bf6317 1891-5396 16906961

Table 1. Helminth species/genera described from brown trout in the lake Øvre Heimdalsvatn (Lien 1976, 1978), with an overview of species involved in their assumed life histories in the lake.

Species/genus	Final host/organ	First intermediate host	Second intermediate host
Discocotyle sagittata (Leuckart 1842) Diesing, 1850	Brown trout, gills
Phyllodistomum umblae (=conostomum) (Fabricius, 1780)	Brown trout, kidney	Bivalves (Sphaerium Scopoli, 1777 and Pisidium Pfeiffer, 1821.)
Crepidostomum metoecus (Braun, 1900) and C. farionis (Müller, 1780) Lühe, 1900	Brown trout, intestine	Bivalves (Pisidium spp., and snail, Radix balthica (Linnaeus, 1758)	Mayflies (Ephemeroptera), Gammarus l acustris
Diplostomum von Nordmann, 1832	Piscivorous birds, intestine	Snail, Radix balthica	Brown trout, European minnow, in eyes
Proteocephalus Weinland, 1858	Brown trout, intestine/ pyloric caeca	Copepods (Cyclops Müller, 1776)
Dibothriocephalus ditremus (Creplin, 1825) Lühe, 1899, and D. dendriticus (Nitzsch, 1824) Lühe, 1899	Piscivorous birds, intestine	Copepods (Cyclops spp.)	Brown trout, organs in body cavity
Cyathocephalus truncatus (Pallas, 1781)	Brown trout, pyloric caeca	Gammarus lacustris
Capillaria Zeder, 1800	Brown trout, intestine	Probably oligochaetes
Eustrongylides Jägerskiöld, 1909	Piscivorous birds, intestine	Oligochaetes	Brown trout, European minnow, in body cavity