Parasitic infection of black tiger shrimp (Penaeus monodon Fabricius) in a Bulacan farm

• Main Author: Puzon, Armando Gasparin
• Format: text
• Language: English
• Published: Animo Repository 2003
• Subjects: Shrimps; Parasites; Bacterial diseases; Seafood > Microbiology
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/3217
• Institution: De La Salle University

Parasitic infection in pond-reared Penaeus monodon from a commercial farm in Hagonoy, Bulacan, is investigated. Bacterial infection was observed in the hepatopancreas. Luminescent yellow and green colonies of Vibrio harveyi could be isolated from this organ in shrimps taken from ponds with bacterial infection. Monodon baculovirus (MBV) occlusion bodies were also seen in the hepatopancreas. In some cases dual bacterial and MBV infections were evident. MBV did not cause inflammation of the hepatopancreas. The white spot syndrome virus (WSSV) was isolated from the gills and detected by polymerase chain reaction from shrimps taken from four ponds. Possible source of MBV and WSSV introduction into the ponds was discussed. Other parasites seen by histopathology included the midgut-infecting gregarine. Cephalolobus and the gill-fouling ciliates Zoothamnium and Lagenophrys, the latter being reported here for the first time from the Philippines. Probable cause of shrimp mortality was, however, implicated due to luminous vibriosis and WSSV infection. Suggestions to prevent or minimize bacterial and viral infections in the grow-out were presented.