title: The effect of zinc on the ultrastructure of the trunk muscle of the larva of Clupea harengus L.
abstract: The ultrastructural changes in the trunk muscle tissue of Clupea harengus L. larvae, hatched from eggs exposed to four different concentrations of zinc (0.5, 2.0, 6.0 and 12.0 ppm), were examined by morphometric analysis. The surface-to-volume ratio of the mitochondrial cristae was significantly reduced with increasing zinc concentrations. At concentrations of 2.0, 6.0 and 12.0 ppm zinc, the relative volumes of the mitochondria increased significantly and individual mitochondria were swollen. At concentrations 2.0, 6.0 and 12.0 ppm zinc, the relative volumes of the myofibrils decreased significantly. At concentrations of 6.0 and 12.0 ppm zinc the sarcoplasmic reticulum showed significant swelling, and in specimens treated in 12.0 ppm zinc the sarcoplasm contains fewer ribosomes.
mesh_terms: D000818:Animals; D007313:Insecta / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008931:Mitochondria, Muscle / Q000648:ultrastructure; D009132:Muscles / Q000187:drug effects / Q000648:ultrastructure*; D012519:Sarcoplasmic Reticulum / Q000648:ultrastructure; D015032:Zinc / Q000494:pharmacology*
chemical_list: D015032:Zinc