Assessment of Gill Pathological Responses in Yellowfin Sea Bream (Acanthopagrus Latus) Under Aeromonas Hydrophila Exposure

Document Type: Short Communication

Authors

Department of Marine Biology, Faculty of Marine Science, Khorramshahr University of Marine Science and Technology, Khouzestan, Iran

Abstract

Bacterial diseases in cultured fish are considered the main problem with aquaculture system in Iran. The gills are multifunctional organs responsible for respiration, osmoregulation, nitrogenous waste excretion, and acid-base balance. Moreover, they are very sensitive to water contamination. Aeromonas hydrophila (A. hydrophila) is an opportunist pathogen responsible for a wide range of diseases in different species of fish. The gill histological alterations were used to assess the effects of A. hydrophila exposure on yellowfin sea bream, Acanthopagrus latus (A. latus). In this regard, 90 A. latus were exposed to the concentrations of A. hydrophila (103 and 106 CFU/ml) for three weeks. The most histopathological alterations in the gill of the exposed fish included hypertrophy and hyperplasia of the epithelial cells, lamellar fusion, club shaping of gill lamellae, lifting of the epithelium and edema of lamellae with large sub-epithelial space, blood congestion, and hypertrophy and hyperplasia of the mucosal cells. The histopathological alterations were observed in the gill of fish exposed to higher levels of A. hydrophila (106 CFU/ml) consisted of aneurysm and hemorrhage with blood congestion. According to the obtained results of this study, A. hydrophila could cause severe histopathological changes in the gill of A. latus and decrease gas change capability in yellowfin sea bream. Furthermore, the findings of the present study suggested that histopathological changes of the gill provide helpful information about the environmental conditions and as particular biomarkers may help the evaluation of fish general health.

Keywords

Main Subjects


Article Title [French]

Évaluation des réponses pathologiques des branchies chez la pagre à nageoires jaunes (Acanthopagrus latus) exposée à Aeromonas hydrophila

Abstract [French]

Les maladies bactériennes chez les poissons d'élevage sont considérées comme le principal problème du système d'aquaculture en Iran. Les branchies sont des organes multifonctionnels responsables de la respiration, de l'osmorégulation, de l'excrétion des déchets azotés et de l'équilibre acido-basique chez le poissonet sont très sensibles à la contamination de l'eau. Aeromonas hydrophila (A. hydrophila) est un agent pathogène opportuniste responsable d'un large éventail de maladies chez différentes espèces de poissons. Les modifications histologiques des branchies ont été utilisées pour évaluer les effets de l'exposition à A. hydrophila sur le pagre à nageoires jaunes, Acanthopagrus latus (A. latus). À cet égard, 90 poissons de l’espèce A. latus ont été exposés à diférenres concentrations d'A. Hydrophila (103 et 106 CFU/ml) pendant trois semaines. Les altérations histopathologiques les plus importantes au niveai deses branchies des poissons exposés incluaient l'hypertrophie et l'hyperplasie des cellules épithéliales, la fusion lamellaire, la formation de lamelles de branchies, la levée de l'épithélium et l'œdème des lamelles avec un grand espace sous-épithélial, la congestion sanguine et l'hypertrophie et l’hyperplasie des cellules muqueuses. D’importantes altérations histopathologiques ont été observées dans les branchies de poissons exposés à des taux plus élevés d'A. hydrophila (106 CFU/ml), qui consistaient en un anévrisme et une hémorragie avec congestion sanguine. Selon les résultats de cette étude, A. hydrophila pourrait provoquer de graves changements histopathologiques dans les branchies de l’A. latus et diminuer la capacité de changement de gaz chez le pagre à nageoires jaunes. En outre, les résultats de la présente étude suggèrent que les modifications histopathologiques des branchies fournissent des informations utiles sur les conditions environnementales et que des biomarqueurs particuliers peuvent aider à évaluer la santé générale des poissons.

Keywords [French]

  • Histopathologie
  • branchie
  • Acanthopagrus latus
  • Aeromonas hydrophila
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