Open Access
Table 2
Environmental characteristic of the fish ponds in Dębowiec − management and stocking practice.
| Pond 1 (Łąki) | Pond 2 (Chłupska) | Pond 3 (Rajski) | |
|---|---|---|---|
| Area | 17 ha | 13 ha | 11 ha |
| Sources of water supply | Rivers Vistula and Knajka | Vistula River | Vistula River |
| Mean depth | 1.5 | 1.2 | 1.0 |
| Bottom sediments | mud | ||
| Pond management | Pond drying, application of calcium oxide, periodic dredging the bottom of ditches (blowdown), feeding the fish with a mixture of grains (triticale) | ||
| Length of drying periods | From one day to five months | ||
| Cyanophytal and algalblooms | Periodic blooms: from late spring to early autumn, that disappear spontaneously | ||
| Fish stocking | Cyprinus carpio L − from its own fish farm | ||
| Mylopharyngodon piceus, Ctenopharyngodon idella, Hypophthalmichthys molitrix, Leuciscus idus, Silurus glanis, Abramis brama, Carassius carassius, Esox lucius, Rutilus rutilus, Perca fluviatilis, Gymnocephalus cernua − are acquired from other fish farms | |||
| Plants | Fish feeding prevents the overgrowing of the ponds | ||
| Shores are covered with Phragmites australis | |||
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