Table 2
Fish-based metrics comprising the Balaton fish index (BFI) assessing the ecological quality ratio (EQR) of Lake Balaton, their categories and scoring by categories. eNPUE (ind. 100 m−1), catch per unit effort by number in electric fishing samples; gNPUE (ind. standard gillnetting effort−1) and gBPUE (g standard gillnetting effort−1), catch per unit effort by number and biomass in gillnetting samples; standard gillnetting effort represents one hour of fishing with a standard gillnet setup − 14 mesh sizes, 2.5 m long each − covering the whole water column. Native, native phytophilous (phyt.), native key species and non-native species are listed in Appendix 1.
| Metrics | Metric categories | Scoring by category | |||||||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
||||||||
| 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | ||
| Electric fishing samples | |||||||||
| 1. nnative with eNPUE ≥ 0.1 ind. 100 m−1 | <8 | 8–10 | 11–12 | 13≤ | 0 | 3 | 7 | 10 | |
| 2. eNPUEphyt. eNPUEtotal −1 | <0.05 | 0.05–0.15 | 0.15–0.25 | 0.25≤ | 0 | 3 | 7 | 10 | |
| 3. eNPUEnon-native eNPUEtotal −1 | <0.01 | 0.01–0.1 | 0.1–0.25 | 0.25≤ | 10 | 7 | 3 | 0 | |
| Gillnetting samples | |||||||||
| 4. nnative with gNPUE ≥ 0.2 ind. standard gillnetting effort−1 | <4 | 4–6 | 7–8 | 9≤ | 0 | 3 | 7 | 10 | |
| 5. gNPUEnon-native gNPUEtotal −1 | <0.01 | 0.01–0.1 | 0.1–0.25 | 0.25≤ | 5 | 3 | 1 | 0 | |
| 6. gBPUEnon-native gBPUEtotal −1 | <0.01 | 0.01–0.1 | 0.1–0.25 | 0.25≤ | 10 | 7 | 3 | 0 | |
| 7. gBPUEcarp gBPUEtotal −1 | <0.001 | 0.001–0.01 | 0.01≤ | 0 | 5 | 0 | |||
| 8. gBPUErazor fish | <20 | 20–200 | 200–1000 | 1000≤ | 0 | 5 | 10 | 5 | |
| 9. gBPUEpikeperch gBPUEtotal −1 | <0.01 | 0.01–0.04 | 0.04–0.08 | 0.08≤ | 0 | 5 | 10 | 5 | |
| 10. gBPUEbream | <300 | 300–1200 | 1200≤ | 0 | 5 | 0 | |||
| 11. gBPUEtotal | <1000 | 1000–4000 | 4000≤ | 0 | 5 | 0 | |||
| Electric fishing and gillnetting samples | |||||||||
| 12. Age structure (balanced: balanced in all native key species and in all other native species with exception of no more than two; partly unbalanced: unbalanced in one key species or at least in three other native species; unbalanced: unbalanced at least in two native key species) | Balanced | Partly unbalanced | Unbalanced | 5 | 3 | 0 | |||
| 13. Health status (good: <5% of individuals show any sign of diseases, heavy infection by parasites, malformations and hybridisation; 5–20% of individuals show some signs of these abnormalities; bad: >20% of individuals are affected). | Good | Moderate | Bad | 5 | 3 | 0 | |||
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