Pathology of amoebic gill disease in Atlantic Salmon (Salmo salar L.) ...
Although AGD has affected the Tasmanian salmonid industry for nearly 20 years, several fundamental questions regarding the pathology of this condition remain unanswered. This thesis elucidates the requirements for AGD outbreaks and how AGD progresses within the commercial culture environment. Atlant...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23235557 https://figshare.utas.edu.au/articles/thesis/Pathology_of_amoebic_gill_disease_in_Atlantic_Salmon_Salmo_salar_L_/23235557 |
| Summary: | Although AGD has affected the Tasmanian salmonid industry for nearly 20 years, several fundamental questions regarding the pathology of this condition remain unanswered. This thesis elucidates the requirements for AGD outbreaks and how AGD progresses within the commercial culture environment. Atlantic salmon Salmo salar L. gills, affected with amoebic gill disease, were analysed by routine histology to identify lesion morphology and distribution patterns. Interlamellar cyst (or vesicle) function was hypothesised as a host defence mechanism leading to entrapment of trophozoites and clearance from hyperplastic tissues by host cellular processes. The degree of conformity between clinical signs and histological lesions was investigated in commercially reared Atlantic salmon. Micro-stereoscopic analysis showed that grossly affected tissue regions correspond to areas of hyperplastic lamellae fusion generally in association with attached amoebae. Agreement between gross signs of AGD and histopathological diagnosis, ... |
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