Exuberant granulation tissue response associated with Neobenedenia sp. (Monogenea: Capsalidae) infestation in two cobia, Rachycentron canadum (Linnaeus)

Abstract

Monogenean parasite infestations are common in captive marine teleosts, and are generally found on the skin and gills. This report describes an unusual pathological presentation of exuberant granulation tissue of the gills, suspected to be related to Neobenedenia infestation in two cobia housed together at a North Carolina aquarium.

Cutaneous angiomatosis‐like presentation in koi carp (Cyprinus carpio koi): Clinical–pathological investigations

“…The granulation tissue formation can be elicited by infectious and non-infectious factors such as chronic trauma. Histologically, it is characterized by plump fibroblasts and small-calibre blood vessels, with hypertrophied endothelial cells, arranged perpendicularly to the overlying epithelium (Hurley-Sanders et al, 2016). In the cases here described, there was an inflammatory cell component, however, Angiomatosis includes a heterogeneous group of non-neoplastic vascular diseases that can affect cutaneous and visceral tissues.…”

“…The granulation tissue formation can be elicited by infectious and non‐infectious factors such as chronic trauma. Histologically, it is characterized by plump fibroblasts and small‐calibre blood vessels, with hypertrophied endothelial cells, arranged perpendicularly to the overlying epithelium (Hurley‐Sanders et al, 2016). In the cases here described, there was an inflammatory cell component, however, the findings were represented by several dermal capillaries lined by hypertrophied cells, interpreted as endothelial cells; the capillaries did not show any specific orientation toward the epithelium, and the presence of newly deposited connective/collagen material was not noted.…”