Abstract
Roach Rutilus rutilus eggs developed in low-concentration solutions of trichlorfon (10−6, 10−5, 10−4, 10−3, and 10−2 mg/l) or N-methyl-N’-nitro-N-nitrosoguanidin (MNNG) with 0.3 mg/l concentration for 54 h after fertilization. Roach fry from different experimental variants differed from the control in terms of growth rate and number of vertebrae in the spinal column and its sections. Irrespective of a change in the direction of growth rate, the number of vertebrae in the spinal column and diversity of vertebral phenotypes increased. The number of vertebrae and Shannon’s index of vertebral column phenotype diversity correlated with the number of anomalies in the structure of axial skeleton. Body proportions of fish with anomalies change due to shortening of deformed fragments of the vertebral column: relative indices of head length and maximum body depth increase. Regarding dispersion of fluctuating asymmetry for the number of openings of seismosensory system in the frontale, dentale and praeoperculum, insignificant differences from the control were found in two cases only: it was lower for the number of openings in dentale in fry exposed to trichlorfon with a concentration of 10−5 mg/l, and higher for the number of openings in praeoperculum in the variant with MNNG.
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Original Russian Text © Yu.V. Chebotareva, Yu.G. Izyumov, M.G. Talikina, 2009, published in Voprosy Ikhtiologii, 2009, Vol. 49, No. 2, pp. 269–276.
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Chebotareva, Y.V., Izyumov, Y.G. & Talikina, M.G. Some morphological features of roach Rutilus rutilus (Cyprindae) fry after exposure to toxicants in the early stages of ontogenesis (vertebral phenotypes, plastic features, and fluctuating assymetry). J. Ichthyol. 49, 200–207 (2009). https://doi.org/10.1134/S0032945209020076
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DOI: https://doi.org/10.1134/S0032945209020076