Adaptations to Osmotic Stress in the Marine-Euryhaline Teleost <i>Periophthalmus dipes</i>: Tissue Water & Mineral Content

Abstract

Water, sodium, potassium, calcium and phosphorus contents were estimated in different tissues of P. Dipes after adaptation to various concentrations of sea water. Water content did not vary significantly in any tissue on adaptation to various salinities. Sodium, potassium, calcium and phosphorus levels of different tissues showed decreasing trend in most of the salinities and absolute fresh water. The results revealed that this fish has ability to adjust the mineral status of its tissues according to the nature of salinity and hence it becomes gradually acclimatized to different salinities without becoming waterlogged.