Limnological changes in a pond ecosystem caused by grass carp (Ctenopharyngodon idella Val.) low stocking density

0342898 - ÚVGZ 2011 RIV CZ eng J - Journal Article
Pípalová, I. - Květ, Jan - Adámek, Z.
Limnological changes in a pond ecosystem caused by grass carp (Ctenopharyngodon idella Val.) low stocking density.
Czech Journal of Animal Science. Roč. 54, č. 1 (2009), s. 31-45. ISSN 1212-1819. E-ISSN 1805-9309
Institutional research plan: CEZ:AV0Z60870520
Keywords : aquatic macrophytes * water and sediment chemistry * phytoplankton
Subject RIV: EH - Ecology, Behaviour
Impact factor: 1.008, year: 2009

Grass carp (Ctenopharyngodon idella Val.) stocked (29 kg/ha) in a small pond reduced the biomass of aquatic macrophytes from 109 g/m(2) to 33 g/m(2) during one growing season. The only changes in hydrochemical parameters (pH, alkalinity, acidity, BOD5, CODMn, NH4-N, NO2-N, NO3-N, TN, PO4-P and TP) associated with the grass carp stocking were a decrease in pH (from 8.43 to 7.57) and in NO3-N concentration (from 0.99 mg/l to 0.56 mg/l). The increases in organic matter content and NO3-N concentration in the surface sediment layer were higher in the control pond than in the pond stocked with grass carp. No changes were detected in the other parameters (NH4-N, PO4-P and TP) in the upper sediment layer and between all parameters measured in the lower inorganic layer. The grass carp grazing had no impact on phytoplankton biomass (concentration of chlorophyll-a) or species composition.
Permanent Link: http://hdl.handle.net/11104/0185507