A month long observation was conducted to study the stages of Hematococcus pluvilais in pond water. The study was conducted in the month of June. After collecting naturally occurring H. Pluvialis from fish farm at Faculty of Veterinary sciences, Shuhama. The study involved observation of different stages of H.pluvialis under controlled conditions. The temperature during days was noted to be around 18-20 degree Celsius during morning hours and 24-27degree in afternoon. The algae were easily harvested during morning hours when the inlet of pond was closed. It was seen that under anoxic conditions, the algal mass turned red in color while as when the water was allowed to flow through inlet the algae changed color to green. The harvested algae were bought to lab conditions to observe the cells under microscope. Fine, motile, red colored and rod shaped algae were seen in abundant. The red color owed to astaxanthin that it produces under stressed conditions. H.pluvialis could be used as fish feed additive particularly in ornamental fish feed to improve its coloration.