Swollen hindgut syndrome (SHG) of tiger shrimp Penaeus monodon (Crustacea, Malacostraca, Penaeidae) post larvae: Identification of causing pathogenic bacteria and their sensitivity to some antibiotics.
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2011, Vol 4, Issue 1
Abstract
Swollen Hindgut syndrome (SHG) of black tiger shrimp Penaeus monodon Fabricius, 1798 post larvae has been reported from Bangladesh shrimp hatcheries in recent years. At present SHG is a budding problem causing significant economic loss to the shrimp hatcheries in Bangladesh. Unlike the rapid mortalities associated with viral disease such as white spot syndrome and yellow head virus, progression of SHG is gradual leading to low level mortalities without affecting swimming activity. The sign of SHG are a bloated or swollen in hind gut area, with the posterior digestive tract convoluting through the last abdominal segment. This syndrome tends to occur at later PL stages, typically after PL10. Two types of Vibrio spp. were isolated from the swollen hindgut syndrome post larvae, identified as Vibrio harveyi (Johnson and Shunk 1936)and Vibrio alginolyticus (Miyamoto, Nakamura & Takizawa 1961). Among these V. alginolyticus was dominant to V. harveyi. The bacterial isolates showed sensitive to oxytetracycline (OTC), norfloxacin and ciprofloxacin and resistant to penicillin, ampicillin and amoxycillin. The luminous V. harveyi showed resistant to many antibiotics and susceptibility to only two drugs. The cause of swollen hindgut syndrome (SHG) was probably bacterial infections and poor water quality, possibly heavy metal i.e. iron, the presence of toxic substances from chemical prophylactics and low quality or diseased nauplii.
Authors and Affiliations
Sheikh Aftabuddin, Naima Akter
Keywords
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