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

• Published in: Aquaculture, Aquarium, Conservation & Legislation Vol. 4; no. 1; pp. 15 - 20
• Main Authors: Aftabuddin, Sheikh, Akter, Naima
• Format: Journal Article
• Language: English
• Published: Cluj-Napoca Bioflux SRL 01.01.2011
• Subjects: Aeromonas; Amoxicillin; Ampicillin; Antibiotics; Aquaculture; Aquatic crustaceans; Bacteria; Bacterial infections; Budding; Ciprofloxacin; Crustacea; Digestive system; Disease; Farming; Fish hatcheries; Fisheries; Gastrointestinal tract; Hatcheries; Heavy metals; Hindgut; Laboratories; Larvae; Low level; Malacostraca; Marine crustaceans; Metals; Mortality; Nauplii; Norfloxacin; Organic chemistry; Oxytetracycline; Pathogenic bacteria; Penaeidae; Penaeus monodon; Penicillin; Seawater; Shellfish; Shrimp culture; Swimming; Toxic substances; Vibrio; Vibrio alginolyticus; Vibrio harveyi; Viruses; Water quality; Waterborne diseases; White spot syndrome; Yellow spot; New York; Bangladesh; United States > US; Philippines
• ISSN: 1844-8143; 1844-9166

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.