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Accumulation, organic carbon and dry matter concentration of sediment in commercial channel catfish ponds
Authors:James A Steeby  John A Hargreaves  Craig S Tucker  Sue Kingsbury
Institution:

a Thad Cochran National Warmwater Aquaculture Center, Mississippi State University, P.O. Box 239, Belzoni, MS 39038, USA

b Aquaculture Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA

c Thad Cochran National Warmwater Aquaculture Center, Mississippi State University, P.O. Box 197, Stoneville, MS 38776, USA

Abstract:Sediment depth and organic carbon (OC) concentration were measured in sediment cores (n=675) collected from 45 commercial channel catfish ponds in northwest Mississippi from April to September in 1998 and 1999. Ponds had been in continuous catfish production from 14 days to 21 years. Sediment depth ranged from 1 to 95 cm and was heterogeneously distributed within ponds: least in the shallow end (26.3 cm) and greatest in deeper areas (33.7 cm). Mean sediment depth increased with pond age, although the rate of sediment accumulation was greatest in the first year (12.5 cm per year). Organic carbon concentration varied slightly within ponds ranging from 0.76 to 3.43% of dry matter (DM). Mean organic carbon concentration in the upper 2 cm of sediment (1.77%) was significantly greater than in the deeper sediment layer (1.55%). Mean dry matter content in the upper 2 cm of sediment averaged 24.2% of total wet weight. Mean dry matter for the lower sediment fraction was 37.8% of total wet weight. Despite large inputs of organic matter from feed and primary production, sediment organic carbon concentrations did not increase with pond age.
Keywords:Aquaculture  Sediment accumulation  Organic carbon  Dry matter
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