 |
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| perca-americana (Perca flavescens, Perca fluviatilis, Plectroplites ambiguus) | |||
| perca-europeia (Perca flavescens, Perca fluviatilis, Plectroplites ambiguus) | |||
| |||
| perca-europeia (Perca fluviatilis) | |||
| perca europeia (Perca fluviatilis) | |||
| Flussbarsch: 3 phrases in 2 subjects |
| Fish farming pisciculture | 1 |
| Natural sciences | 2 |