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With water quality and supply becoming more uncertain, more hatcheries are looking seriously at RAS and PRAS as the future of operational resilience. Since RASTECH25 in June, I've been consulting with experts about new ideas for you. Stay tuned!
- Jean Ko Din, Editor
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Atlantic salmon smolts raised in freshwater recirculating aquaculture systems (RAS) were smaller than those raised in freshwater net pen lochs, but grew faster as post-smolts when both groups were transferred to a saltwater cage site, said a recent study from the University of Stirling.
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New research from the University of Victoria (UVic) in B.C. shows how heatwaves can have a major impact on marine ecosystems. Researchers reviewed 331 studies and reports from the 2014 to 2016 North American Pacific coast heatwave, and compiled a comprehensive overview of its ecological impacts.
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In intensive rainbow trout culture, side-swimmers – fish that swim in a coordinated manner, but with orientation altered so that they appear to be swimming on their sides – are a relatively common observation. Rainbow trout appear to be particularly affected.
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The resiliency of cleaner fish, lumpfish, extends to surviving regardless of changes in water quality, such as fluctuations in temperature, salinity, or ammonia levels. In this article, we examine how water quality can affect fish welfare and how risks can be mitigated.
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Water treatment systems for hatcheries must be designed to provide consistent water quality year-round, despite wide seasonal variations.
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