Naslov
Impact of silver and bighead carp (Cyprinidae) on plankton and water quality in fish ponds

Autori
Bukvić, Ivančica ; Kerovec, Mladen ; Plenković-Moraj, Anđelka ; Mrakovčić, Milorad

Izvornik
Biologia (Bratislava) (0006-3088) 53 (1998), 2; 145-157

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Cyprinidae; bighead carp; silver carp; common carp; phytoplankton; zooplankton; fish-ponds; trophic state.

Sažetak
The effect of the filter-feeding fishes - silver carp, Hypophthalmichthys molitrix and bighead carp, Aristichthys nobilis - in polyculture on the trophic state and plankton communities of experimental fish ponds was studied in the course of two years (1993-1994). All ponds were highly eutrophic. Nevertheless, control fish ponds had higher phytoplankton biomass and density then carp treatments. Zooplankton density was reduced in the presence of filter-feeding fishes. During 1993, numbers of microfilter-feeders (Cladocera) and macrofilter-feeders (Copepoda) decreased markedly in carp treatment with higher stocking rate. As zooplankton is considered effective in controlling phytoplankton, zooplankton feeding, together with fast circulation of phosphate, is a key factor in the failure of planktivorous carps to control algae. More work needs to be done to determine the most appropriate fish stocking density for water quality control.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA