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Table 4
Mean of trophic state index in relation to seasons and collection sites in the studied aquaculture area in the Itaipu Reservoir.
| Parameters | TSI (Chla) | TSI (TP) | TSI (S) | TSI | Trophic classification |
|---|---|---|---|---|---|
| Seasons | |||||
| Spring | 57.9 | 52.5 | 54.7 | 55.1 | Eutrophic |
| Summer | 42.6 | 26.1 | 38.4 | 35.7 | Oligotrophic |
| Autumn | 48.8 | 40.5 | 44.2 | 44.5 | Mesotrophic |
| Winter | 55.2 | 45.7 | 57.1 | 52.6 | Eutrophic |
| Points | |||||
| 1 | 52.8 | 46.9 | 49.4 | 49.7 | Mesotrophic |
| 2 | 53.3 | 44.3 | 48.9 | 48.8 | Mesotrophic |
| 3 | 54.6 | 50.4 | 48.7 | 51.3 | Mesotrophic |
| 4 | 53.3 | 44.1 | 48.7 | 48.7 | Mesotrophic |
| 5 | 53.3 | 54.2 | 48.9 | 52.2 | Mesotrophic |
| 6 | 53.9 | 44.5 | 48.9 | 49.2 | Mesotrophic |
| 7 | 56.3 | 43.7 | 48.8 | 49.6 | Mesotrophic |
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