The effects of salinity domestication on Na+/K+-ATPase activity,cortisol content,and tissue structure of rainbow trout and golden trout
To understand the effects of salinity taming to the gill of rainbow trout(Oncorhynchus mykiss)and golden rainbow trout(Oncorhynchus mykiss),with salinity 0 as the control group,the Na+/K+-ATPase activity in the gills and serum,cortisol content in serum,and histological changes in gills and kidneys of rainbow trout and golden rainbow trout domesticated at salinity levels 15‰ and 30‰ were studied.The results showed that compared with the control group,under low salinity,the Na+/K+-ATPase activity in the gills of rainbow trout and golden rainbow trout increased with the increase of domestication salinity.However,under high salinity domestication,the Na+/K-AT-Pase activity in the gills of both groups was inhibited,the Na+/K+-ATPase activity in the serum was lower,and the activity did not change significantly with salinity.The serum cortisol concentra-tion increased with the increase of domestication salinity,and the cortisol content in the serum of rain-bow trout and golden rainbow trout reached the highest value under salinity 30‰.The tissue sectio-ning results of rainbow trout and golden rainbow trout showed that high domestication salinity caused damage to the kidneys and gill tissues of both species.The renal tissues were characterized by the de-struction and complete disappearance of renal capsule and glomeruli,as well as a significant increase in the number of chloride cells and shedding of gill epithelial cells and thinning and elongation of gill fila-ments in the gill tissues.
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