Comparative histopathology of mucosa associated lymphoid tissue in the gills of Atlantic salmon Salmo salar and southern bluefin tuna Thunnus maccoyii ...

• Main Author: Norte Dos Santos, CDC
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Atlantic salmon; Salmo salar
• Online Access: https://dx.doi.org/10.25959/23238536.v1; https://figshare.utas.edu.au/articles/thesis/Comparative_histopathology_of_mucosa_associated_lymphoid_tissue_in_the_gills_of_Atlantic_salmon_Salmo_salar_and_southern_bluefin_tuna_Thunnus_maccoyii/23238536/1

The recent identification of an interbranchial lymphoid tissue (ILT) revealed that an organized mucosa-associated lymphoid tissue (MALT) was present in the gills of salmonids. Due to its location in the gills, and lymphoid nature, it was hypothesized that the ILT could be affected by amoebic gill disease (AGD). AGD is caused by a protozoan parasite, Neoparamoeba perurans. This disease is considered a serious problem for the health and welfare of marine farmed salmonids. AGD affects the gills of fish, causing significant pathology, such as hyperplasia of the lamellae leading to lamellar fusion. This research, therefore, aimed to understand the effects of AGD in the ILT of Atlantic salmon (Salmo salar) using histological techniques. Two studies were undertaken to evaluate the effects of AGD in the structure and cellularity of the ILT. In the first study, Atlantic salmon were exposed to N. perurans trophozoites, and sampled prior to exposure and at 3, 7, 14 and 28 days post-exposure. Histology was performed for ...