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Salmon Aquaculture Leader Grieg Seafood Purchases 3 FlowCams to Mitigate Harmful Algal Blooms

Historically, Grieg Seafood has relied upon manual microscopy to identify and count algae as they monitored for HABs and to determine if there was a need to employ mitigation strategies. On any given day, there could be upwards of 100 species of algae, and using manual microscopy can be like trying to find a needle in a haystack. The quality of the analyzed data is not consistent, and the process is prone to error.

Grieg Seafood salmon pens Shetland
Grieg Salmon Aquaculture pens in Shetland Scotland

Grieg Seafood plans to use the FlowCam to make more informed decisions around HAB monitoring. They have the experience and the judgment to make the right calls. What they need is more data.

“HABs move quickly,” says Dean Trethewey, Seawater Production Director at Grieg Seafood, “the ocean is an ever-changing environment; for us it is not a matter of if we see HAB’s, but when. HABs can have an impact on our stocks causing reduced feed rates and even mortality. As climate change identifies increasing algae species, we need to adapt to this new environment more quickly.”

With their purchase of a FlowCam, Grieg will have more accurate and reliable data regarding the presence of harmful algae, and will be able to better determine when and where to enact mitigation strategies. Grieg will continue to use manual microscopy to detect algae, but will accompany and verify their manual analysis with the FlowCam. By having confidence in sampling, Grieg will be able to make better decisions about feeding or not feeding. And having more accurate data regarding the presence of harmful algae will also help Grieg save time and money by helping determine when and where to actively pursue mitigation strategies.

Explore Aquatic Applications

Read more about Grieg Seafood and FlowCam in these specific publications:

Fish Farming Expert -


EcoMagazine -



Topics: Harmful Algal Blooms, Aquaculture