Gill disease surveillance
Gill disease affects fresh and marine aquaculture worldwide. In marine cultured Atlantic salmon, gill disease has been established as one of the most significant health challenges in the last decade. Amoebic gill disease (AGD) caused by the amoeba Neoparamoeba perurans is the most established, easie...
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| Format: | Conference Object |
| Language: | English |
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2023
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| Online Access: | https://pure.sruc.ac.uk/en/publications/11c7dce2-cb6d-408f-8c2e-9e21118e3869 https://www.nbfgr.res.in:804/home.aspx |
| Summary: | Gill disease affects fresh and marine aquaculture worldwide. In marine cultured Atlantic salmon, gill disease has been established as one of the most significant health challenges in the last decade. Amoebic gill disease (AGD) caused by the amoeba Neoparamoeba perurans is the most established, easiest recognized and only treatable type of marine gill disease. Other types are parasitic gill disease, viral gill disease, bacterial gill disease, zooplankton-associated gill disease (caused often by cnidarian nematocysts), harmful algal gill disease and chemical/toxin-associated gill disease. Especially zooplankton-associated gill disease in particular has caused severe mortality in Scottish salmon aquaculture in 2022 and 2023. When principal pathological changes in the gill are non-specific, either in combination with, or in the absence of, one or more of the seven distinctive types of gill disease (including AGD), the type of gill disease is referred to as complex gill disease (CGD). This talk uses surveillance for AGD and CGD as an example to discuss surveillance of gill disease for specific and non-specific conditions. Disease surveillance consists of many components. Diagnostic test evaluation and sample size calculations ensure accuracy, reliability, and representativeness of collected data. Together with data collection, management, analysis, dissemination, information technology, and collaboration, they form a comprehensive framework that can enable effective disease monitoring and decision-making. A variety of diagnostic tests is used for surveillance of AGD and CGD. Common tests for AGD are gross gill scores, histopathology, molecular techniques, and immunofluorescence antibody tests. For CGD there are fewer options because the case definition includes a variety of infectious agents or no primary pathogens in the case of environmental insults. Commonly used tests are therefore less pathogen-specific gill scores and histopathology. These tests have different characteristics, including expense, whether the ... |
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