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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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