Assessing the Apparent Prevalence, Pathology and Molecular Detection of
                    Aphanomyces invadans
                    in Native Fish Species of the Sylhet Region, Bangladesh

Md. Siddikur Rahman Sujon; Md. Shaif Rahman; Arman Hossain; Md. Moshiur Rahman; Sarker Mohammed Ibrahim Khalil; Sabuj Kanti Mazumder; M. M. Mahbub Alam; Shamima Nasren; Md. Abdullah Al Mamun

doi:10.1002/aff2.70232

journal article Open Access Apr 01, 2026

Assessing the Apparent Prevalence, Pathology and Molecular Detection of Aphanomyces invadans in Native Fish Species of the Sylhet Region, Bangladesh

Md. Siddikur Rahman Sujon Md. Shaif Rahman Arman Hossain

Md. Moshiur Rahman Sarker Mohammed Ibrahim Khalil Sabuj Kanti Mazumder M. M. Mahbub Alam Shamima Nasren Md. Abdullah Al Mamun

Aquaculture, Fish and Fisheries Vol. 6 No. 2 · Wiley

View at Publisher Save 10.1002/aff2.70232

Abstract

ABSTRACT

The primary objective of this study was to investigate the presence of
Aphanomyces invadans
and its association with
Aeromonas hydrophila
in naturally infected fish from two wetlands (
beels
) in the Sylhet, Bangladesh. Over a 6‐month period (October 2020 to March 2021), a total of 396 fish were examined from Singari
beel
, of which 90 were found positive for
A. invadans
infection, resulting in an apparent prevalence of 22.7% (95% confidence intervals: 18.8%–27.1%) and in Aral
beel
, 33 out of 300 fish exhibited ulcerative lesions and tested positive with apparent prevalence of 11.0% (95% CI: 7.7%–15.1%). Under normal temperature conditions of 25 ± 0.4°C,
A. invadans
formed opaque, irregular, white translucent colonies on Czapek Dox agar. Microscopic examination revealed elongated, non‐septate hyphae. Histopathological analysis showed chronic granulomatous inflammation surrounding deeply penetrating fungal hyphae. The presence of
A. invadans
was confirmed through PCR, producing a specific 234 bp product from infected tissue. In addition, the study detected the prevalence of
A. hydrophila
, associated with Motile Aeromonad Septicemia (MAS), through PCR amplification of a 1450 bp product. Sequence analysis confirmed its similarity to
A. hydrophila
sequences in the NCBI database (Accession no.: ON833076.1). Among the various fish species studied, it was evident that
Clarias batrachus
and
Anabas testudineus
were particularly susceptible to the pathogen. Additionally, the infection of
A. invadans
appeared to spread notably during the month of January. In summary, the outcomes of this investigation underscore the continued prevalence of Epizootic Ulcerative Syndrome (EUS) within the water bodies of the Sylhet region. This study sheds light on the intricate interactions between these pathogens and the susceptible fish species, contributing valuable insights into the dynamics of these infections in aquatic environments.

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Published: Apr 01, 2026
Vol/Issue: 6(2)
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Md. Siddikur Rahman Sujon