This study was performed to determine the effects of betaine on
acclimation of tilapia to sea water. Fish was fed with feeds containing
different doses of betaine (0% (control dose), 1%, and 2%) during 43
days in fresh water then transferred to SWCRS (Sea Water Fish Culture
and Research Station) and acclimated to sea water in seven days
gradually. After transfer, fish was fed with the same feeds during 22
days, too. Measurements of Na+/ K+/ATPase activity of the gill and
histological analysis of osmoregulative tissues (gill and kidney) were
carried out.