Publications by authors named "Sebastien Donnet"
We used 4 years of publicly available data (2016-2019) on chemical usage at salmon sites with information on production, stocking, locations and environmental conditions to explore patterns of anti-sea lice treatments in a Canadian province. Results show that sequential chemical treatments are prevalent, emamectin benzoate (EMB) with azamethiphos being the most used combination with a decrease in ivermectin usage. Relatively high rates of usage of EMB per fish biomass may point to potential lice resistance patterns with information needed on mechanisms and local populations.
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- The study investigates how finfish aquaculture affects benthic communities at hard bottom sites by using visual indicators like bacterial mats and opportunistic polychaetes.
- Regulatory thresholds exist, where exceeding a certain level of these indicators can indicate unhealthy organic loading, but the links between these indicators and overall biological diversity (like species richness) remain uncertain.
- The research found a notable decrease in taxon richness near aquaculture sites, correlating this decline with the presence of visual indicators, and emphasizing that all indicators should be used together to assess environmental impacts accurately.
Finfish aquaculture can be installed over hard and patchy substrates where grab sampling is challenging and use of video can be an appropriate tool to document benthic changes. Video monitoring can show visual indicators of enrichment, namely flocculent matter, Beggiatoa-like mats, and opportunistic polychaete complexes (OPC). We examined factors influencing presence of indicators using 52 video monitoring reports collected in Newfoundland, Canada.
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