Overview on pathogenesis and histopathological observations of hyperostosis in two fish species; Scomberoides lysan (Forsskal, 1775) and Pomacanthus sextriatus (Cuvier, 1831) collected from El- Jubail province, Saudi Arabia

Abstract

During years 2012 to 2018, two fish species, doublespotted queenfish (Scomberoides lysan) and sixbar angelfish (Pomacanthus sextriatus) were regularly examined during filleting processing in fish markets at Jubail province, Saudi Arabia. The routine fish inspection of the fillet-by products (fish skeletons) of these two species showed prominent and frequent hard circumscribed ossified masses attached to the spines. In Scomberoides lysan 60% of the examined fishes were affected and the hyperosteoid overgrowths were noticed in both haemal and neural spines. In Pomacanthus sextriatus 10% showed nearly the same lesion but it was mainly observed in the neural spines. In gross examination, the swelling appeared very hard, round and smooth; the cut section showed grayish-white, granular, greasy and hard central contents. In histopathological examination, the hard masses showed hyperosteoid bony tissue with variable degrees of ossification surrounded with peripheral fibrous tissue capsule containing dilated lymph and blood vessels and accompanied with edema. The underlying tissue was a thick layer of acellular calcified bony tissue while the central area of the swelling was honeycomb in its appearance with cavities filled with blood and adipocytes together with golden brown pigments, hemosiderin. Our study concluded that hyperostosis occurs at high prevalence rates in S. lysan and P. sextriatus with characteristic histopathological lesions.

Hyperostotic bones observed in the first record specimen of spotted sicklefish,Drepane punctata(Linnaeus, 1788), from the Gulf of Oman

“…More than 28 years have elapsed since Smith‐Vaniz et al (1995) stated that hyperostosis has been reported in 22 families. Since then, 21 fish species belonging to 14 families were identified with the hyperostosis characteristics (Fjelldal et al, 2012; Jawad, 2013; Jawad et al, 2015; Jawad & Bannai, 2014; Jawad & Ibrahim, 2017; Mahmoud & Ibrahim, 2021; Matic‐Skoko & Ferri, 2009; Meunier et al, 1999; Meunier et al, 2010; Paig‐Tran et al, 2016; Smith‐Vaniz & Carpenter, 2007; Tuna et al, 2021). This anatomical anomaly has been also reported in fossilized specimens (Lidour et al, 2020; Meunier et al, 2010; Schlüter et al, 1992).…”