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- Title
The influence of fish culture in floating net cages on microbial indicators of water quality.
- Authors
Gorlach-Lira, K.; Pacheco, C.; Carvalho, L. C. T.; Melo Júnior, H. N.; Crispim, M. C.
- Abstract
This work was carried out to analyse the microbiological parameters of the water quality of a reservoir used for the irri-gation and culture of tilapia (Oreochromis niloticus) in floating net cages. The physico-chemical parameters, counts of mesophilic total aerobic bacteria, total and thermotolerant coliforms and fecal streptococci, and the presence of Esche-richia coli in samples of water collected in three sites of the reservoir (pre-culture site, culture site, post-culture site) were analysed. The levels of ammonia (0.047-0.059 mg/L), nitrite (0.001-0.021 mg/L) and total phosphorus (0.050-0.355 mg/L) in the water did not show significant differences (p > 0.05) between sampling sites. The levels of total bac-teria in the water varied between 1.3 x 104 and 67.3 x 104 CFU/100 mL. The MPN values of thermotolerant coliforms (< 930 M PN/100 mL) were within values recommended for water used for fish culture and/or irrigation. The presence of E. coli and fecal streptococci were verified in 48% and 56% of analysed samples, respectively. The site with floating net cages showed more samples contaminated with E. coli and fecal streptococci than other sampling points
- Subjects
FISH farming; ANIMAL cages; AQUATIC microbiology; WATER quality; TILAPIA; AEROBIC bacteria; COLIFORMS
- Publication
Brazilian Journal of Biology, 2013, Vol 73, Issue 3, p457
- ISSN
1519-6984
- Publication type
Article
- DOI
10.1590/S1519-69842013000300001