The unchanged plasma glucose and haematocrit in
Gold fish that were exposed to the di¡erent salinities
and temperatures also supported the absence of
stress in ¢sh in our experiment. The increase in the
number of red cells (haemoconcentration) is signi¢-
cantwhen freshwater ¢sh are under saltwater stress.
According to what was described, salinity increased
haematocrit in stenohaline species, such as Tilapia