STRUCTURAL CHANGES IN ULTIMOBRANCHIAL GLAND OF TILAP IN RESPONSE TO INCREASED ENVIRONMENT SALINITY

Dr. Mukesh Kumar Napit*

ABSTRACT

The present study has been planned to observe the effects of different salinity on the ultimobranchial gland and carpus stanious cells in an eryhaline teleost fish Tilapia (O.mossambicus). Cytophysiological studies along with some biochemical observation. Therefore it is planned to study the effect of increased salinity concentration at different time of year specially in calcium regulatory organs. Very little data is available (shukla, 1993 and singh, 1997) on this physiological aspect of catfish in our Country. It is interesting to study the effects of increased salinity at different phases of its reproductive cycle i.e., during pre-spawning, spawning and post-spawning periods specially on calcium regulatory organs. Since not much work is available on this aspects is was planned to explore this line with an ervhaline teleost fish Tilapia. Due to its easy availability and also tenacity, the eryhaline fish Tilapia, was selected. Work on eryhaline is almost rare in this animal with exposure to external stress. This fish was procured during the different periods of the year a stock was maintained for a continuous supply of these animals.

Keywords: Fish Tilapia, (O.mossambicus) Ultimobranchial Gland, Carpous Stnious Cells, Chemicals, and Salt Concentration.