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 3. Mean (Mea.) and median (Med.) intensity, and prevalence (Prev.) of helminths sampled from different age-classes of brown trout in the lake Øvre Heimdalsvatn, as an average for the months June, July, and September 2011.| Age-class (winters) |
|---|
| | 3–4 | | | 5 | | | 6 | | | 7–8 | | | 9–10 | | | 11–15 | |
|---|
| Intensity | | Intensity | | Intensity | | Intensity | | Intensity | | Intensity | |
|---|
| Parasite species | Mea. | Med. | Prev. | Mea. | Med. | Prev. | Mea. | Med. | Prev. | Mea. | Med. | Prev. | Mea. | Med. | Prev. | Mea. | Med. | Prev. |
|---|
| Discocotyle sagittata | 1.7 | 1.0 | 35.3 | 3.4 | 2.0 | 77.8 | 6.2 | 6.0 | 90.9 | 6.1 | 7.0 | 82.4 | 8.5 | 5.0 | 84.6 | 8.8 | 5.5 | 100 |
|---|
| Phyllodistomum umblae | 2.2 | 2.0 | 27.8 | 5.2 | 3.5 | 100 | 10.3 | 10.0 | 90.0 | 7.6 | 6.0 | 81.3 | 8.5 | 4.5 | 60.0 | 4.3 | 2.0 | 70.0 |
|---|
| Crepidostomum farionis | 2.0 | 2.0 | 25.0 | 3.0 | 3.0 | 16.7 | 3.0 | 3.0 | 50.0 | 2.8 | 3.0 | 38.5 | 3.4 | 3.0 | 100 | 1.7 | 1.0 | 37.5 |
|---|
| Crepidostomum metoecus | 10.7 | 5.0 | 100 | 16.2 | 14.5 | 100 | 17.4 | 8.0 | 100 | 21.3 | 20.0 | 100 | 27.8 | 15.0 | 100 | 29.4 | 21.5 | 100 |
|---|
| Diplostomum sp. | 17.3 | 12.0 | 88.2 | 59.6 | 49.0 | 100 | 54.8 | 54.5 | 100 | 60.4 | 55.5 | 100 | 66.7 | 55.0 | 100 | 111.7 | 86.0 | 100 |
|---|
| Proteocephalus sp. | 1.0 | 1.0 | 5.9 | 0.0 | 0.0 | 0.0 | 3.0 | 3.0 | 18.2 | 3.3 | 3.0 | 17.6 | 1.5 | 1.5 | 15.4 | 11.5 | 11.5 | 16.7 |
|---|
| Cyathocephalus truncatus | 1.3 | 1.0 | 23.5 | 1.7 | 2.0 | 33.3 | 3.5 | 3.0 | 33.3 | 4.6 | 2.0 | 47.1 | 1.4 | 1.0 | 38.5 | 6.0 | 3.0 | 58.3 |
|---|
| Dibothriocephalus ditremus | 1.8 | 2.0 | 29.4 | 18.5 | 18.5 | 22.2 | 11.0 | 8.0 | 27.3 | 23.3 | 7.0 | 60.9 | 10.0 | 5.0 | 44.4 | 44.4 | 2.0 | 50.0 |
|---|
| Dibothriocephalus dendriticus | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 | 5.60 |
|---|
| Capillaria sp. | 1.0 | 1.0 | 17.6 | 2.0 | 2.0 | 42.9 | 2.8 | 2.5 | 33.3 | 2.7 | 2.0 | 50.0 | 1.7 | 2.0 | 42.9 | 3.5 | 3.5 | 20.0 |
|---|