Use of Behavioral Responses of Rainbow Trout Oncorhynchus mykiss in Identifying Sublethal Exposure to Hexavalent Chromium

Svecevičius, Gintaras
May 2009
Bulletin of Environmental Contamination & Toxicology;May2009, Vol. 82 Issue 5, p564
Academic Journal
Laboratory tests were conducted in a flow-through apparatus on 1-year-old rainbow trout Oncorhynchus mykiss to evaluate the sensitivity of a number of their behavioral responses to hexavalent chromium (Cr6+). Test fish were exposed to Cr6+ concentrations corresponding to 0.001–1 parts of the rainbow trout 96-h LC50 (0.029–28.5 mg Cr/L, respectively) in short-term (15 min) tests. Sensitivity parameter responses could be arranged into the following sequence: latent period of detection response = locomotor activity > gill ventilation frequency > coughing rate. All the rainbow trout responses were sensitive behavioral indicators of sublethal exposure. Behavioral responses meet the criteria as rapid tools for bioassay testing and could be easily standardized using Cr6+ as a reference toxicant.


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