Effects of salinity and temperature on glomeruli of common carp (Cyprinus carpio)



Environmental factors including salinity and temperature can affect the physiology and performance of fish growth. Therefore many of fish's internal organs such as kidney, show wide range of morphological and functional changes. In this study, histological changes of kidney tissue of common carp with average weight and length 38.28 ± 0.58 g and 14.04 ± 0.10 cm respectively is studied. Juvenile common carp were exposed for 21 days in groups at 20, 25 and 30°C and three salinity levels 0, 5 and 10ppt. After biometry, sampling was performed on 7th day and 21st day and then to the laboratory. The kidney was fixed in Bouin's solution for 24-48 hours and stained with Hematoxylin–Eosin. The results showed that glomerular size with high temperatures in the double-sampling significantly reduced and the maximum size of glomerular observed at 20°C (P0.05) lower than that of temperature (P