Chitinolytic Bacterial Disease Infected in Scylla serrata (Forsskal, 1775) Fattening Farm of Tamil Nadu

Chitinolytic bacterial disease is responsible for great economic losses in the commercial mud crab fattening in the farm of Tamil Nadu. In this study, water quality parameters analysed for normal and infected farm of fattening period. The normal farm observed in the minimum temperature 3 days and maximum 45 days. The infected farm also observed in the minimum temperature of 27 days and maximum 39 days. The water temperature appears to have a strong influence on the observed temporal patterns of the recent shell disease outbreak. The histological examinations of normal and diseased mud crab Scylla serrata gill lamellae were examined. The chitinolytic bacterial disease affected in the S. serrata ventral surface was showed. The infected gill lamellae showed degradation of the epithelial layer and haemolytic nodules were observed the haemal sinuses.