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Avoidance response of rainbow trout Oncorhynchus mykiss to heavy metal model mixture after long-term exposure in early development



Avoidance response of rainbow trout Oncorhynchus mykiss to heavy metal model mixture after long-term exposure in early development



Bulletin of Environmental Contamination and Toxicology 71(2): 226-233



This study was conducted to determine the effect of a 70-day pre-exposure of rainbow trout to model mixture (HMMM) consisting of 7 heavy metals (copper, zinc, nickel, chromium, lead, cadmium and manganese) in early development (starting from early-eyed embryos stage to finishing yolk-sac resorption stage in late alevins) to the intensity of avoidance response in fishes when they become 1-year-old. Two series of separate avoidance tests were conducted using two different groups of test fishes (fertilized eggs and adults). The fertilized eggs were pre-exposed to varying concentrations (0.2-30%) of HMMM and were allowed to grow for one year until their average weight and length were similar to the control fishes. Both groups were then put into a chamber and allowed to choose between polluted and clean water zones for 2.5 h. Results of the avoidance test showed that rainbow trout were able to detect and avoid very low sublethal concentrations of HMMM. The intensity of avoidance response was directly proportion to HMMM concentration logarithm. It was also observed that the response of the pre-exposed and control fishes were similar. Although pre-exposed fishes less intensively avoided 0.5 and 1.0% concentrations of HMMM as compared to the control, no significant difference was observed between their avoidance thresholds. It is concluded that acclimatization of fishes to heavy metals is of temporary character and these fishes recover after a specific period of time independently whether they are pre-exposed to toxic substances in during early or late in life.

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Accession: 003656137

Download citation: RISBibTeXText

PMID: 14560371

DOI: 10.1007/s00128-003-0154-6


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