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Encystment of parasitic freshwater pearl mussel (Margaritifera margaritifera) larvae coincides with increased metabolic rate and haematocrit in juvenile brown trout (Salmo trutta)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013). Gothenburg University, Sweden.ORCID iD: 0000-0003-0762-6551
Gothenburg University, Sweden.
Gothenburg University, Sweden.
Gothenburg University, Sweden; Swedish Anglers Association, Gothenburg, Sweden.
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2017 (English)In: Parasitology Research, ISSN 0932-0113, E-ISSN 1432-1955, Vol. 116, p. 1353-1360Article in journal (Refereed) Published
Abstract [en]

Gill parasites on fish are likely to negatively influence their host by inhibiting respiration, oxygen transport capacity and overall fitness. The glochidia larvae of the endangered freshwater pearl mussel (FPM, Margaritifera margaritifera (Linnaeus, 1758)) are obligate parasites on the gills of juvenile salmonid fish. We investigated the effects of FPM glochidia encystment on the metabolism and haematology of brown trout (Salmo trutta Linnaeus,1758). Specifically, we measured whole-animal oxygen uptake rates at rest and following an exhaustive exercise protocol using intermittent flow-through respirometry, as well as haematocrit, in infested and uninfested trout. Glochidia encystment significantly affected whole-animal metabolic rate, as infested trout exhibited higher standard and maximum metabolic rates. Furthermore, glochidia-infested trout also had elevated levels of haematocrit.The combination of an increased metabolism and haematocrit in infested fish indicates that glochidia encystment has a physiological effect on the trout, perhaps as a compensatory response to the potential respiratory stress caused by the glochidia. When relating glochidia load to metabolism and haematocrit, fish with low numbers of encysted glochidia were the ones with particularly elevated metabolism and haematocrit. Standard metabolic rate decreased with substantial glochidia loads towards levels similar to those of uninfested fish. This suggests that initial effects visible at low levels of encystment may be countered by additional physiological effects at high loads, e.g. potential changes in energy utilization, and also that high numbers of glochidia may restrict oxygen uptake by the gills.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 116, p. 1353-1360
Keywords [en]
Glochidia, Haematocrit, Host, Margaritifera, Metabolic rate, Parasite
National Category
Zoology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-69608DOI: 10.1007/s00436-017-5413-2ISI: 000398734700024OAI: oai:DiVA.org:kau-69608DiVA, id: diva2:1255527
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2020-01-21Bibliographically approved

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Filipsson, KarlÖsterling, Martin

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