Environmental changes in organisms are always
associated with a number of physiological responses.
Theoretically these responses can be
measured in fish and in other vertebrates in the
form of changes in hormonal or substrate concentration
in the plasma or alterations in the blood
parameters (Donaldson, 1981). Salinity is an important
factor in the environmental condition of
fish by influencing osmotic pressure and metabolism
(Mustafayev and Mekhtiev, 2008); causing
changes physiological functions, habits, and survival
of fish (Wang and Zhu, 2002).