Abstract
The ultrastructural changes in the brain cells of Clupea harengus L. larvae, hatched from eggs incubated in four zinc concentrations (0.5, 2.0, 6.0 and 12.0 ppm), were examined by morphometric analysis. The fine structure of the brain cell was affected by zinc at all concentrations examined. Significant swelling of the nuclear membranes, rough endoplasmic reticulum, an increase in intracellular spaces and a decrease in the relative volume of mitochondria were observed. At 12.0 ppm zinc significant reduction in the relative volume of the nucleus, degeneration of the mitochondrial cristae and a reduction in the ribosomes were observed.
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