关键词: 卵形鲳鯵（Trachinotus ovatus）, 刺激隐核虫(Cryptocaryon irritans), 组织病理学, Trachinotus ovatus, Cryptocaryon irritans, histopathology

Abstract: Abstract: Tissue sections, HE staning and microscopic observation was adopted to investigate the histopathological changes of trachinotus ovatus with the Cryptocaryon irritans Disease. Histological examination of the visible infection of the gills and skin caused by direct mechanical injury; because the fish in the hypoxia condition, there may also be cryptocaryonirritans secretion of toxins, fish skin damage caused by bacterial or viral infection caused by indirect injury of liver, spleen and kidney in different degree. The performance of the gill function is seriously blocked；liver showed severe fatty liver degeneration, disordered hepatic cord, shruken or disappeared blood sinus; tissues and structures of spleen were not distinctive, but congestion, hemorrhage and necrosis were observed; renal structure was not clearly shown, renal tubule and renal corpuscle were shrunken, renal tubule showed fused cells (adhered), loosen and expanded iterstitial space, local cell necrosis, and fatty granules.