Table 3
Overall diet of Eurasian otter Lutra lutra on Chotýšanka stream (Chotýšanka 1, fishery no. 413 006) in winter 2005/2006: n, total number of individuals identified in the spraints; %n, percentage of frequency; 95% CI (%n), 95% confidence interval on percentage by frequency; b [g], estimated biomass identified in the spraints [g]; %b, percentage of estimated biomass; 95% CI (%b), 95% confidence interval on percentage by estimated biomass; %FO, frequency of prey occurrence; L mean, mean fish length [cm]; L min–max, minimum–maximum fish length [cm]; W mean, mean fish weight [g]; W min–max, minimum–maximum fish weight [g]; N/A, data not available.
| Species | n | %n | 95% CI (%n) | b [g] | %b | 95% CI (%b) | %FO | L mean | L min–max | W mean | W min–max |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cyprinidae | |||||||||||
| Bleak (Alburnus alburnus) | 4 | 0.3 | 0.0–0.5 | 2 | 0.0 | 0.0–0.2 | 1.4 | 5.1 | 4.0–6 | 0.6 | 0.2–0.9 |
| Common carp (Cyprinus carpio) | 14 | 0.9 | 0.7–1.1 | 2926 | 15.7 | 5.1–26.7 | 5.0 | 16.9 | 5.5–45 | 209.0 | 2.4–1736 |
| Common dace (Leuciscus leuciscus) | 2 | 0.1 | 0.0–0.1 | 10 | 0.1 | 0.0–0.1 | 0.7 | 8.6 | 8.4–9 | 4.9 | 4.5–5.4 |
| European chub (Squalius cephalus) | 95 | 6.0 | 4.8–7.4 | 2508 | 13.4 | 12.3–14.5 | 23.8 | 10.9 | 2.9–30 | 26.4 | 0.2–250 |
| Gudgeon (Gobio gobio) | 1331 | 83.4 | 79.2–86.7 | 7041 | 37.7 | 34.9–41.3 | 100.0 | 7.8 | 3.1–16 | 5.3 | 0.2–35 |
| Roach (Rutilus rutilus) | 12 | 0.8 | 0.5–0.9 | 378 | 2.0 | 1.8–2.6 | 4.3 | 12.5 | 7.1–28 | 31.5 | 3.3–210 |
| Stone moroko (Pseudorasbora parva) | 14 | 0.9 | 0.4–1.3 | 22 | 0.1 | 0.1–0.1 | 5.0 | 6.2 | 5.0–8 | 1.6 | 0.8–2.3 |
| Salmonidae | |||||||||||
| Brown trout (Salmo trutta m. fario) | 27 | 1.7 | 1.3–2.1 | 415 | 2.2 | 1.7–2.8 | 9.7 | 12.2 | 8.6–18 | 15.4 | 4.6–45.7 |
| Rainbow trout (Oncorhynchus mykiss) | 7 | 0.4 | 0.2–0.7 | 2082 | 11.1 | 4.8–17.5 | 2.5 | 33.1 | 32–34 | 297.0 | 250–323 |
| Percidae | |||||||||||
| European perch (Perca fluviatilis) | 14 | 0.9 | 0.5–1.4 | 473 | 2.5 | 2.0–2.9 | 5.0 | 13.4 | 8–18 | 33.8 | 5.5–69 |
| Balitoridae | |||||||||||
| Stone loach (Barbatula barbatula) | 9 | 0.6 | 0.2–0.9 | 42 | 0.2 | 0.1–0.3 | 3.2 | 8.2 | 6–10 | 4.7 | 1.7–7.6 |
| Cottidae | |||||||||||
| Bullhead (Cottus gobio) | 3 | 0.2 | 0.0–0.4 | 15 | 0.1 | 0.0–0.2 | 1.1 | 7.4 | 6.9–8 | 4.9 | 3.8–6.5 |
| Non-fish | |||||||||||
| Frogs (Rana spp.) | 54 | 3.4 | 2.8–4.1 | 2322 | 9.6 | 8.0–11.0 | 14.9 | N/A | N/A | 43.0 | N/A |
| Crayfish (Astacus fluviatilis) | 9 | 0.6 | 0.2–1.0 | 459 | 2.5 | 0.1–4.3 | 3.2 | N/A | N/A | 51.0 | N/A |
| Total | 1595 | 100.0 | – | 18695 | 100.0 | – | – | 8.4 | 2.9–45 | 10.4 | 0.2–1736 |
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