Neobenedenia girellae is considered an epizootic infection for intensively cultured fish species. Particularly, for greater amberjack (Seriola dumerili) N. girellae causes high mortality rates and supposes a bottleneck during its on-growing period. Thus, the objective of this work was to describe the skin morphological alterations caused by a N. girellae infection on greater amberjack. Greater amberjack juveniles were sampled pre and post experimental infection with N. girellae obtaining cranial and dorsal skin samples. Samples were processed for morphological and ultrastructural studies and revealed clear differences in the structure of both regions, confirming the cranial region as the most susceptible region to be parasitized due to an absence of scales and lower goblet cells density. N. girellae adhesion disrupted the structure of epidermal epithelial cells by overpressure. Stratum spongiosum surface-epithelial cells located near the parasite presented a clear cell degradation process, associated in some cases with cellular detachment. N. girellae infection induced epidermal hydropic degeneration and, in some cases, focal spongiosis. Tissue ulcerative lesions caused by the parasite’s attachment structures were characterized by a specific mobilization of leucocytes to the fixation areas. Thus, N.girellae induces important alterations in greater amberjack epidermis independently of the skin region that explain the appearance of secondary infections and associated mortalities.

对于集中培养的鱼类，新本尼迪亚网纹菌被认为是一种流行病感染。特别是，对于更大的a鱼（Seriola dumerili），吉里猪笼草会导致较高的死亡率，并且在其成长期期间会造成瓶颈。因此，这项工作的目的是描述由大mber鱼上的N. girellae感染引起的皮肤形态变化。实验性感染前后感染了较大的mber鱼少年获取颅骨和背侧皮肤样本。对样品进行了形态学和超微结构研究，发现这两个区域的结构存在明显差异，这证实了由于没有鳞片和较低的杯状细胞密度，颅骨区域是最易被寄生的区域。长颈鹿的粘连通过超压破坏了表皮上皮细胞的结构。位于寄生虫附近的海绵体表面上皮细胞呈现清晰的细胞降解过程，在某些情况下与细胞脱落有关。吉氏猪笼草感染导致表皮水样变性，在某些情况下还引起局灶性海绵状变性。由寄生虫的附着结构引起的组织溃疡性病变的特征是白细胞特异性地移动到固定区域。因此，N.girellae可以独立于皮肤区域，在较大的琥珀色表皮中诱发重要的变化，这说明了继发感染和相关死亡率的出现。