Abstract

The ultrastructure of the mesonephros of the natural population of Atlantic salmon smolts (Salmo salar L., 1758) and brown trout smolts (Salmo trutta L., 1758) inhabiting the Luga River in Leningrad oblast, Russia, was studied. The general plan of the mesonephric kidney structure is presented. Specific features of the structure of leukocytes and nephron of salmonids under smoltification are described. The size of leukocytes and the height of the epithelial cells of the proximal tubules of the kidneys of salmon smolts are greater in comparison with those kidney cells of freshwater teleost fishes. The number, size, and population density of mitochondria, as well as the development of a rough and smooth endoplasmic reticulum in different types of cells of the mesonephros of salmon smolts, are higher than those in freshwater fish. A similar pattern is observed for the number of vesicles in the basal part of the distal tubule of the kidneys of the salmon smolt in comparison with freshwater fish. Cells with radially arranged vesicles (CRAVs) of different ultrastructures have been found for the first time in mesonephros of Atlantic salmon. All the described features of the ultrastructure of mesonephros cells are revealed for the smolts prior their migration into sea water.

中文翻译：

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大西洋鲑鱼Salmo salar L.（波罗的海种群）和褐鳟Salmo trutta L.鲑鱼的中生超微结构的特殊特征。

摘要

大西洋鲑（Salmo salar L.，1758）和褐鳟（Salmo trutta）鲑的自然种群的中生的超微结构L.，L.，1758）居住在俄罗斯列宁格勒州的卢加河。介绍了中肾结构的总体计划。描述了在糖化作用下鲑鱼的白细胞和肾单位的结构的特定特征。与淡水硬骨鱼的肾细胞相比，鲑鱼大白鲑肾脏肾脏的白细胞大小和上皮细胞高度更大。线粒体的数量，大小和种群密度，以及鲑鱼的中性肾的不同类型细胞中粗糙而光滑的内质网的形成均高于淡水鱼。与淡水鱼相比，鲑鱼的肾脏远端小管基部的囊泡数量观察到类似的模式。首次在大西洋鲑的中肾中发现了具有不同超微结构的放射状囊泡（CRAV）的细胞。臭鼬在迁移到海水之前，揭示了所有描述的中肾细胞超微结构特征。