Evaluation of physical and chemical parameters and research on Vibrio parahaemolyticus in water samples from Anil river estuary (São Luis, state of Maranhão, Brazil)- DOI: 10.4025/actascibiolsci.v25i2.1978

Abstract

Study of physical and chemical parameters and isolation of Vibrio parahaemolyticus in some water samples from Anil river estuary (São Luis, state of Maranhão, Brazil) at natural banks of mollusks. The technique of the most probable number (MPN) with enrichment and a subsequent isolation was used in Thiosulphate citrate bile salt agar (TCBS). In addition, some physical and chemical parameters were monitored “in situ”. The determinations for pH varied (7.25 to 7.90), O₂ (0.20 to 1.2mg/L), T°C (29 to 32°C), S‰, (5 to 28.0 UPS), NH₄⁺ (0.04 to 3.41mg/L), NO₂- (0.10 to 1.91mg/L), PO₄^3- (0.03 to 4.88mg/L). The presence of V. parahaemolyticus was detected in 56.1% of station I and 55.4% of station II with levels from 1.1x10 to 1.1x105MPN/mL). The results require some special attention from the environmental control and Public Health organizations as soon as possible because the riverain communities are exploring the alive resources from that ecosystem as their own feeding and commerce