Study of kidney and gill function in Salmo trutta caspius fingerlings after move to the Caspian Sea

Caspian trout (Salmo trutta caspius) is an anadromous and valuable fish species in the Caspian Sea. Electrolytes concentration (Mg2+ and Ca2+) and kidney and gill development trend were studied in different weight groups. Specimens in 4 weight groups 5, 10, 15 and 20g. Each trial was done in 3 replicates. The observation of kidney glomeruli in histological sections showed that the diameter of glomeruli in all weight groups in Caspian water decreased after 72h adaptation period (P0.05), although in other groups (10, 15 and 20g) a significant increase in chloride cell's number and size was detected. The number of chloride cells on gill's secondary lamellas varied between 3 to 7 (in two gills lamellas)