Abstract
Loose shell syndrome is a chronic disease in shrimp industries, in the present study, two different L. vannamei grow-out ponds (normal and LSS infected ponds) were selected to study their water quality parameters. Average Body Weight (ABW) and Daily Growth Rate (DGR) in Prakasam district of Andhra Pradesh. The results of the present study showed, there was no much variation in water quality parameters between both the ponds except pH. The daily growth rate and average body weight was higher in the normal pond than LSS infected one. The maximum LSS prevalence was reached up to 20%. The infected shrimps became sluggish and negative allometric growth. The results of present study revealed that the LSS infected shrimps showed lower production in the grow-out pond.
Highlights
Rapid development together with the intensification of farming practices since last two decades has created several problems in the shrimp industry
The pH in the normal pond was varied between 7.63 and 8, minimum was recorded on the 49th and days of culture (DOC) and maximum was observed on 35th DOC
The Dissolved Oxygen (DO) level in the normal pond was ranged between 2.8 and 4.9 ppm, minimum was recorded on 133rd DOC and the maximum was observed on 35th DOC and in Loose Shell Syndrome (LSS) affected pond was varied between 3.6 and 4.9 ppm, minimum was recorded on the 133rd DOC and maximum was on 112th DOC (Figure 1D)
Summary
Rapid development together with the intensification of farming practices since last two decades has created several problems in the shrimp industry. Disease outbreaks in cultured shrimps are the major concern which resulted in severe economic losses. In addition to existing disease problems, several diseases of unknown etiology remain to be studied to determine the causative agent and mechanisms of infection. LSS is one of the important chronic disease. This is due to the poor bottom conditions of the ponds. The affected shrimp has a soft carapace with a gap between the muscle tissue and exoskeleton, shrunken hepatopancreas [1]
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