Table 1
Fish indicators used in the CZ-FBI index. Gear = extent of source data (i.e., gear and depth strata); ρTP = correlation coefficient with total phosphorus; poor, moderate and good class (with standardize value of the indicator in parentheses) = value ranges for each category of ecological class; WFD criteria = criterion type used for the assessment of ecological potential. NA: ρTP was not calculated because of only two values in the dataset; gear: benthic (BG) or pelagic (PG) gillnets; all = data from all strata. All indicators except the last one are based on fish older than 0+.
| Indicators | Gear | ρTP | Poor class (1) |
Moderate class (3) |
Good class (5) |
WFD criteria |
|---|---|---|---|---|---|---|
| 1. Total fish biomass in dam part [kg · 1000 m‑2] | PG 0–6 m |
0.37 | >35 | 17–35 | <17 | Abundance |
| 2. Total fish biomass in tributary part [kg · 1000 m‑2] | PG 0–6 m |
0.58 | >70 | 35–70 | <35 | Abundance |
| 3. Total fish abundance [ind · 1000 m‑2] | BG all | 0.59 | >600 | 300–600 | <300 | Abundance |
| 4. Relative biomass of common bream[%] | BG all | 0.55 | >10 | 5–10 | <5 | Community composition |
| 5. Relative abundance of ruffe [%] | BG all | 0.53 | >20 | 10–20 | <10 | Community composition |
| 6. Relative biomass of European perch [%] | PG all | −0.57 | <10 | 10–20 | >20 | Community composition |
| 7. Relative biomass of rudd [%] | BG and PG all | −0.62 | <1 | 1–5 | >5 | Community composition |
| 8a. Relative biomass of Salmonidae [%] < 700 m · a s l. | BG and PG all | −0.12 | <1 | 1–2 | >2 | Community composition |
| 8b. Relative biomass of Salmonidae ≥ 700 m a s l. | BG and PG all | NA | <2 | 2–5 | >5 | Community composition |
| 9. Presence of 0+ fish of 6 species (common bream, roach, bleak, ruffe, European perch, pikeperch) | BG and PG all | 0.59 | <2 | 2–3 | >3 | Age structure |
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