Some observations on the problem of jelly fish ingress in a power station cooling system at Kalpakkam, east coast of India

S. Rajagopal, K.V.K. Nair, J. Azariah


The seasonal distribution and abundance of jelly fishes in the coastal waters of Kalpakkam (Tamil Nadu, east coast of India) in the context of their ingress into the cooling system of a power plant was studied. Three species of jelly fishes Dactylometra quinquicirrha (L. agassiz), Crambionella stuhlmanni (Chun) and Chiropsalmus buitendijki (Horst) were found in such abundance as to cause blockage of the cooling water intake screens. The seasonal variation in the incidence of the jelly fishes clearly showed that the periods of maxima and minima were different for each species. During the period of study (February 1988 to April 1989) three maxima were noted - May, July and October. On any given single day, maximum quantity of jelly fishes collected from the travelling screens was 29 tonnes (21 July 1988). The data are discussed with respect to (i) qualitative and quantitative variations in the ingress (ii) operational problems associated with ingress and (iii) possible approaches to combat the problem.


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