Effect of Pseudomonas aeruginosa on the giant freshwater prawn, Macrobrachium rosenbergii--histopathological and electron microscopic study.

The giant freshwater prawn Macrobrachium rosenbergii was injected with an inoculum containing LD, 96 hr dose of 10' Pseudomonas aeruginosa (MTCC 1688) to determine the histopathological effects in vivo. The comparison of tissues of both the control and the bacterial endotoxin treated prawns after 96 hr revealed significant degenerative changes in treated prawns. Both light microscopic and electron microscopic observations revealed the infiltration of the tissues of Pseudomonas sp in the muscular and hepatopancreatic tissues of prawn.

Enumeration of hydro-biological parameters and assessment of eco-aquafarming potential in the Velachery Lake (Chennai).

In recent years, aquaculture has acquired vast potential in providing livelihood, security as well as fulfilling the nutritional requirements of the growing population. The hydro-biological parameters studied in Velachery Lake revealed that a large number of essential parameters are conforming to the levels suggested for a shrimp farm. The abundance and availability of zooplankton population reveal their importance in prawn culture.

Effect of Pseudomonas aeruginosa (MTCC 1688) on the tissue phosphatases activity on Macrobrachium rosenbergii (De Man).

A time course study on the endotoxin toxicity of the gram negative bacteria, Pseudomonas aeruginosa MTCC 1688 on the tissue phosphatases activity on the giant freshwater prawn, Macrobrachium rosenbergii was conducted. The results revealed marked elevation of both acid and alkaline phosphatase activity in the haemolymph and body muscle. The hepatopancreas showed reduced phosphatase activity compared to control.