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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