Potassium dichromate as a reference substance for embryonic tests of toxicity in the common carp (Cyprinus carpio L.)
2006
Krejci, R.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie a Vcelarstvi) E-mail:[email protected] | Palikova, M.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Ekologie a Ochrany Zivotniho Prostredi)
The aim of this study was to determine and compare values of LC50 for potassium dichromate during the whole period of embryonic development (i.e. 120 h) and 48 h after hatching of embryos in Cyprinus carpio. Fish eggs and embryos were exposed to 5 different concentrations of potassium dichromate (372, 409, 450, 495, 545 mg/L) during two experiments. Cumulative mortality, start and end of hatching, number of deformities, body length and body mass of surviving individuals were studied. The highest mortality was found in the hatched embryos. Mortality and frequency of deformities increased with the growing concentration of potassium dichromate. The value of 120 LC50 for potassium dichromate was 464.91+/-23.83 mg/L and the value of 48 LC50 was 458.94+/-4.14 mg/L. No significant difference between 120 LC50 a 48 LC50 values was found. That is why we suggest to reduce the exposure period in embryonic tests of toxicity to only 48 h after hatching.
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