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- Title
Effects of lining and drying on the chemical composition of sediments and influence of organic carbon on carp growth in aquaculture ponds.
- Authors
Kassila, J
- Abstract
Abstract Chemical characteristics and P-fractionation of sediments from the Deroua fish culture farm (Beni Mellal, Morocco) were analysed in 1998 and 1999. The high concentrations of organic N and organic C in the sediments reflect the high productivity of phytoplankton in the lined ponds. Despite the fact that these ponds were not frequently fertilized, inorganic P was more important in the sediments. The P released from CaCO3 ≈P was the principal source of P for phytoplankton. The mineralization rate of organic C during the drying period was about 87 µg g-1 day-1 in the sediments. The mineralization rate of organic N seems to be less, compared with organic C. The experimental results indicate that the C:N ratio and texture of sediments could explain the immobilization of organic N. All forms of P remained almost unchanged after the drying period except for Fe(OOH)≈P. The ferric (oxy) hydroxides protect NaOHext -P from the bacterial lyses and stabilize therefore their concentration. The inorganic P represented about 88% of Total P in the sediments and may influence the mineralization rate of organic P. The growth of silver carp were reduced in presence of high concentrations of organic C in sediments (> 30 mg/g). Compounds toxic to fish such as Fe2+ , Mn2+ , H2 S and CH4 were then released in the water column.
- Subjects
MOROCCO; CARP; CARBON; AQUACULTURE
- Publication
Aquaculture Research, 2003, Vol 34, Issue 4, p333
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1046/j.1365-2109.2003.00822.x