Effect of temperature, salinity and fluoride on the plasmatic constituents concentration of antarctic fish Notothenia rossii (Richardson, 1844)

Abstract

The Antarctic marine environment has unique characteristics such as isolation, low and even temperatures, as well as high levels of fluoride in the trophic web. The objective of the present study is to verify the effect of temperature, salinity and dietary fluoride in the diet on the levels of plasma constituents of the fish Notothenia rossii. The sample collection and the bioassay were conducted at Antarctic scientific station Comandante Ferraz. The fish were acclimated in an aquarium at temperatures of 0 and 4 °C; salinity of 35 and 20 psu, using feed with and without fluoride. The combination of these variables resulted in 8 experimental groups. The calcium serum levels were reduced in hyposaline stress and temperature elevation reduced the plasmatic levels of magnesium and chloride. The trophic fluoride isolatedly was not capable of changing the non-protein electrolytes levels.