Use Inhibition Rate of Vertical Movement Ability of Daphnia Carinata as an Indicator of Chromium Acute Bio-Toxicity

In order to develop a sensitive bio-monitor and a quick method for detecting water pollution, this research used a specific Daphnia Carinata clone (Dc42) to study its reaction or behavior to water pollutant, such as the ability of vertical movement, EC50 and LC50 in chromium solution. The results showed that the numbers of Daphnia Carinata population decreases with the rise of Cr6+ concentration in the upper of the tuber. Compared to the standard EC50 and LC50 bioassay, the detection limit of 8h-Ri (inhibition rate of vertical movement ability) was 76.40%, 61.00%, 68.20% and 53.87% lower than that of 24h-LC50, 48h-LC50, 24h-EC50 and 48h-EC50, respectively; similar to 96h- LC50 and 96h-LC50. The sensitivity of Daphnia Carinata clone (Dc42) in response to pollutants showed a good and attractive prospect to use its population behavior as a biomonitoring approach for water quality. It has the potential to be a sensitive, quick and efficient method for detecting pollutants in water.