Abstract
From November 2006 to March 2007, a pond used for rearing Nile tilapia (Oreochromis niloticus), located at the Experimental Aquaculture Station in Pindamonhangaba, São Paulo State, Brazil (22º56’27”S and 45º26’32,2”W), was chosen to develop studies focused on ecotoxicology (acute and chronic tests) with Ceriodaphnia dubia in order to evaluate the water quality from six different sites of sampling: the fish farming upstream, inside fish pond, its effluent, the mixing zone (site related to the mixture of the effluent with the receiving water), and upstream and downstream of the receiving water. Only the effluent was analyzed in five concentrations. Statistical methods employed were Fisher’s exact test, ANOVA (Dunnett’s method) and ICp. Survival average of test-organisms from the control group was 89.80% with an average of 20 neonates/female, and coefficient of variation 28.05%. Average values for NOEC and LOEC (p < 0.05), and IC50 for the effluent tested were 50.0%, 100.0% and 50.13%, respectively. Results have demonstrated toxic effect in all sites of sampling, and it indicates that treatments of inflow water and effluent are necessary.
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