摘要：The present study describes the development of excretory organ (kidney) in post flexion to fingerling stages of the Himalayan snowtrout Schizothorax plagiostomus (Heckel). In observation Schizothorax plagiostomus larvae having a pair of elongated kidney lies above the alimentary canal close to the vertebral column, which is divided into two parts i.e. head kidney and the trunk kidney. In post-flexion to fingerling larvae, the pronephric nephrons and tubules form immediately after the pronephric duct, which connect with the anterior most tips of pronephric duct. Pronephric tubules were convoluted in anterior side and there is a small amount of erythroid and lymphoid tissue associated with this region. At the same time caudal portion of the pronephric duct (near cloaca) starts to become broad in comparison to other parts in 2.0-4.0 cm larvae. On fingerling stage obvious tubules were found in kidney with large blast like cells (Columnar epithelial cells) between the nephric tubules.
