Ecology, Environment and Conservation Paper

IMPACT OF ALTERED PH RNECILA ON MORTALITY RATE, OXYGEN CONSUMPTION AND EXCRETION M PRAWN, PANAEUS MONODON

V. Sailaja, E. Madhuru, K. Ramesh Babu, S. Rama Krishna and M. Bhaskar

Abstract

Panaeus monodon of body weight 6.0 ± 0.5gm were selected to study the mortality rate, mean survival time, 0, consumption, unit metabolism, excretory pattern of prawn on exposure to different ranges of both alkaline and acidic pH media. At pH 3.5 and pH 10.5 highest mortality (100%) and least mean survival time were observed. At pH 4.5, 50% mortality and 72hrs of mean survival time was recorded, where as at pH 10.0 mortality rate was 20% and mean survival time was 96hrs. At pH 5.5 to 9.0 at the every interval of pH 0.5, mean survival time was highest. 0, consumption, unit metabolism, ammonia, ammonia/oxygen were estimated. 02 consumption and unit metabolism were reduced in both acidic and alkaline exposed prawns over control. However, the reduction is less in alkaline exposure. But the ammonia content was showed opposite trend in both groups. In acidic exposed prawns the reduction was significant and considerable elevation was seen in alkaline exposure and ammonia/oxygen ratio also showed similar trend.