Histopathological survey of cultured shrimps in modified extensive systems of Cochin, Kerala.

Ambipillai, Liya (2001) Histopathological survey of cultured shrimps in modified extensive systems of Cochin, Kerala. Masters thesis, Central Institute of Fisheries Education.

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Abstract

A disease survey was conducted using histopathological tools in a cross section of shrimp farming area in Cochin during March to June, 2001. Shrimp samples collected from 26 farms comprised of Penaeus indicus, Penaeus monodon. and Metapenaeus dobsoni. The major pathological condition recorded was the presence of chronic inflammatory fesions characteristic of systemic bacterial infection and was observed in 42% of the farms surveyed. In 19% of the farms hepatopancreatic pathology, typical of oral/enteric vibriosis was recorded. Mortality of P.monodon due to mixed infection of MBV and vibriosis was recorded in one farm. Fouling of shrimps by the ciliate protozoan, Zoothamnium could be detected only in 8% of the cases. Abnormal conditions such as spontaneous muscle necrosis, dark coloured gills and brown discolouration of the shell were recorded in 36% of the farms. Absence of white spot viral inclusions in any of the target tissues of the samples examined was one of the most important observations during the study. No apparent pathological conditions were recorded in 27% of the farms surveyed.

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