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|
|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|
|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|
|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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