Prevalence of Motile Aeromonas Septicaemia (MAS) in fish culture systems of the Central Brahmaputra Valley Zone of Assam, India

Abstract

The present study was undertaken to find out the incidence of Motile Aeromonas Septicaemia (MAS) in the freshwater aquaculture system in three districts viz. Nagaon, Morigaon and Sonitpur of Assam. A total of 293 number pools were screened for bacteriological and mycotic studies. Out of 293 pools screened, 91 (31.05%) were found to be positive for Aeromonas species, 131 (44.70%) for A. invadans and 55 (18.77%) for S. parasitica. Among Aeromonas genera, A. hydrophila, A. veronii and A. sobria were detected with 51.64%, 21.97% and 18.68% respectively. The prevalence of other Aeromonas species (7.69%) was also recorded during the study. Data on the seasonal prevalence of MAS reveal that the highest prevalence (62.63%) was recorded during the winter season followed by post monsoon (20.87%) and premonsoon (12.08%). Thus, study suggests that motile aeromonads remain an important bacterial pathogen from aquaculture point of view in Assam, which requires regular and constant examination of cultured fish to resist unexpected losses.

Mitigating Aeromonas hydrophila infection in Nile tilapia through dietary Basella alba and Withania somnifera supplementation: A bioassay‐guided fractionation approach

“…It is acknowledged that Aeromonas infection retards growth in freshwater fish (Saharia et al, 2021), and the statement is also reflected in the present study. Decreased WG resulted into higher FCR value in bacteria‐challenged groups (Gr‐ II, V) compared to control group (Gr‐ I) or plant extract fed groups (Gr‐ III, IV, VI, VII).…”

Comparative genomic analysis of Aeromonas dhakensis and Aeromonas hydrophila from diseased striped catfish fingerlings cultured in Vietnam

“…The most frequently occurring disease in striped catfish farming is motile Aeromonas septicemia which causes big economical losses for the aquaculture sector, not only in Vietnam but globally ( Stratev and Odeyemi, 2017 ). Motile Aeromonas septicemia is caused by motile Aeromonas spp., mainly A. hydrophila , A. caviae , A. veronii and A. dhakensis , but variations in the prevalence of each species occur depending on the geographical region and cultured aquatic species ( Stratev and Odeyemi, 2017 ; Azzam-Sayuti et al, 2021 ; Saharia et al, 2021 ). The symptoms of motile Aeromonas septicemia include anorexia, hemorrhage of internal organs and red coloring of the skin due do hemorrhage ( Nielsen et al, 2001 ).…”

Aeromonas dhakensis: A Zoonotic Bacterium of Increasing Importance in Aquaculture

“…cause gastroenteritis, infections of wounds, skin and soft tissues and bacteraemia, with the most commonly isolated species being Aeromonas caviae, Aeromonas dhakensis, Aeromonas hydrophila and Aeromonas veronii biovar sobria [2][3][4]. Meanwhile, several species, notably A. hydrophila, A. dhakensis, A. veronii, Aeromonas jandaei, Aeromonas sobria and A. caviae, are responsible for motile Aeromonas septicaemia (MAS) syndrome in many species of fish, a debilitating condition implicated in significant morbidity and mortality losses in warm-water intensive aquaculture [5][6][7][8][9][10][11][12]. MAS has a varying presentation across hosts, with typical external signs in fish including reddened or eroded fins, diffuse haemorrhages on the skin, eyes and fins, scale loss and appearance of surface lesions, distension of the abdomen, inflammation of the anus and exophthalmia [13][14][15].…”