Histological and Histochemical Characteristics of Some Organs of Serioladumerili Fishes from the Libyan Eastern Coast

Abstract

The paucity in the literature or published studies on the histological and information regarding the histological and histochemical features of Yellowtail (Seriola dumerili) on the Libyan eastern coast led to a study of the histological and histochemical structures of different organs (skin, gill, and liver) in Seriola dumerili fish from the Libyan eastern coast. Twenty male fish were collected twice (ten fish each) in March 2022 from two fisheries sites on the eastern Libyan coast. Immediately, skin, gill, and liver samples were collected and preserved in Bouin's solution, and then the paraffin sections were stained with H&E, Crossmon’s trichrome, and PAS stain for histochemical and histological studies. Histological examination revealed that the skin of Seriola dorsalis consisted of epidermis, dermis, and hypodermis with numerous mucous and club cells. Also, Seriola dorsalis had four pairs of crescent-shaped gill arches with primary and secondary lamellae lined by chloride cells, a few mucous cells, columnar cells, and pavement cells. The liver of the Seriola dumerili fish had less obvious lobulation and consisted of hepatic cords separated from each other by blood sinusoids. Also, intracellular melanomacrophage aggregations, less typical portal triads, and intra-hepatic exocrine pancreatic tissue in the hepatic tissue were noticed