• M Srinivasulu Reddy

      Articles written in Proceedings – Animal Sciences

    • In vivo sub-acute physiological stress induced by phosphamidon on carbohydrate metabolism in phasic and tonic muscles of penaeid prawn,Penaeus indicus (H Milne Edwards) during acute and chronic exposure

      M Srinivasulu Reddy K V Ramana Rao

      More Details Abstract Fulltext PDF

      Penaeid prawn,Penaeus indicus (H Milne Edwards), was subjected to acute (2 day) and chronic (15 day) exposure to sublethal concentration (0·2 ppm) of phosphamidon, and changes in the carbohydrate metabolism of phasic and tonic muscles were investigated. Differential patterns in carbohydrate metabolism were witnessed. The glycogen content of phasic muscle was elevated, whereas that of tonic muscle was depleted in response to acute exposure. During chronic exposure, both muscle tissues had elevated glycogen content. In general, both phasic and tonic muscles exhibited low-level of glycolysis and elevated oxidative pathway operation, leading to elevated glycogen content. Both, phasic and tonic muscle metabolisms were oriented towards conservation of carbohydrates and lesser production of organic acids during chronic exposure, as a possible adaptive metabolic mechanism of this prawn enabling it to counteract the toxic stress imposed by phosphamidon.

    • Phosphamidon induced alterations in the nitrogen metabolic profiles of penaeid prawn,Penaeus indicus during acute and chronic exposure

      M Srinivasulu Reddy K V Ramana Rao

      More Details Abstract Fulltext PDF

      Changes in the nitrogen metabolic profdes of midgut gland, muscle and gill tissues were studied, following the exposure ofPenaeus indicus to acute (2 day) and chronic (10, 20 and 30 day) exposure to sublethal concentration (0–2 ppm) of phosphamidon. The proteolytic activity of phosphamidon exposed prawn tissues was significantly elevated. All the phosphamidon exposed prawn tissues showed efficient mechanisms of ammonia detoxification in the chronically exposed prawns when compared to acutely exposed prawns. The survivability of these prawns in the polluted habitats might be due to the operation of compensatory adaptive mechanisms in the metabolic profdes such as increased biosynthesis of different kinds of proteins and also the detoxification and transformation of ammonia, the toxic nitrogenous end product of aquatic organisms.

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