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Informal fish culture in the Maracanaú waste stabilisation ponds in Fortaleza, Brazil

2000; Pergamon Press; Volume: 42; Issue: 10-11 Linguagem: Inglês

10.2166/wst.2000.0687

1996-9732

Felipe José da Silva, D. D. Mara, H. W. Pearson, S. E. Mota,

Fish Biology and Ecology Studies

The Maracanaú WSP in Fortaleza, the largest pond system in northeast Brazil, treating combined domestic and industrial (mainly textile) wastewater, was studied during a 13 month period. BOD and COD removal was 93 and 84%, respectively. On average the algal biomass represented 58% of total BOD in the ponds (3.3 mg per 100 μg of chlorophyll a). Ammonia removal was high (95%) but phosphorus was poor (20%). Faecal coliform removal reached 6 log10 units and the count in the final effluent was ≤1,000 cells/100 ml. This performance was expected since the hydraulic retention time was greater than 100 days. Informal fish culture of Nile tilapia (Oreochromis niloticus) was practised by local fishermen in the secondary and tertiary maturation ponds with yields of 1,706 and 241 kg/ha, year, respectively. Capture per unit efforts (CPUE) were similar to those found in local inland fisheries. However fish biometry showed a poorly attractive product for commercial purposes, with mean individual fish weights of less than 100 g.