Anna Spiessens, Author at AQUAPHOENIX

Bird's-eye view of small islands connected by a road with several aquaculture pens varying in size and either connected or separated.

The path to clean aquaculture in the Baltic Sea

ArticlesMay 18, 2026

Novel solutions tailored to regional needs: AQUAPHOENIX in Åland Fish farming in Åland has huge potential for growth, with the area being well-positioned to supply regional and international markets with healthy, sustainable food. But this growth requires continuous commitment to sustainability. In Åland, fish farming permits depend on compliance with strict regional limits for nitrogen…

The many uses of sludge: how AQUAPHOENIX partners convert “waste” into resources

ArticlesMarch 24, 2026

The first part of the AQUAPHOENIX project’s mission is to capture the sludge (waste) released by fish in open pen aquaculture farms. But that’s not all! Our partners in research, technology and industry are working to realise the circular potential of sludge. Learn about why and how we’re testing the uses of recycled sludge -…

A photo from under water of a school of fish.

Aquaculture’s role in the circular economy

ArticlesJanuary 7, 2026

Explore the potential of aquaculture to contribute to the circular food economy, and how AQUAPHOENIX advances that potential. What is the circular economy? The circular economy is a system in which the value of consumer products and the resources they are made of is extended, for as long as possible. It aims to minimise…

The Norwegian flag on the rear of a sailing ship, creating a lingering wake on the fjords.

In light of Hardangerfjord report, sludge management is key for sustainable growth

NewsDecember 11, 2025

A scientific report has been published on aquaculture emissions in the Hardangerfjord environment. Hardangerfjord is not currently over-fertilised, but researchers have stated that the area cannot withstand further emissions Fish sludge (excess feed and faeces) is a contributor to emissions of organic particulate matter but also dissolved bioavailable nutrients. Managing sludge is therefore key for…

A pair of large tubes, one of which still rolled up. The unrolled tube is connected a smaller tube on the sides and a disk at the end. Two men are standing on the side and reading on a phone.

First phase of testing AQUAPHOENIX technology in Åland complete

NewsNovember 4, 2025

In Summer 2025, AQUAPHOENIX partners in Åland completed the first phase of tests on novel sludge collection technology. They focussed on the first step of the process: pumping the waste (sludge) that accumulates beneath open pen fish farms. Fish pen at Brändö Lax farming site, a leading partner in the Åland pilot.During the pilot, technology…

Yellow buoys are floating on glasy and slightly rippled water with a part of an aquaculture cage visible on the right side of the picture. In the back are vegetated hills and the sky is cloudy.

AQUAPHOENIX researchers conduct first seafloor sampling in Hardangerfjord

NewsOctober 6, 2025

At the beginning of September 2025, AQUAPHOENIX partners carried out the first seafloor sampling campaign in Hardangerfjord for Work Package 2 which focuses on assessing the environmental impact of aquaculture emissions and evaluating the effects of sludge removal. The Work Package 2 team brings together researchers from NORCE, NIOZ, and LUKE, working in close collaboration…

Five round aquaculture cages with nets covering the surface. The cages are connected through lines with small yellow buoys in between. The sky is blue with few thin clouds and the darkblue water has many small ripples. In the back are small mountains with low, darkgreen vegetation, bare areas and a few spots with snow. At the base of the mountain is a house.

Meet the scientists measuring the environmental impact of clean aquaculture

ArticlesSeptember 12, 2025

The AQUAPHOENIX project is piloting ground-breaking technology that will collect and remove sludge (aquaculture waste) from open sea fish pens in Norway and Åland. This technology has the potential to transform how we manage waste from open pen aquaculture - and it is also expected to have a positive impact on the surrounding environments. Marine…

Water surface with light penetrating through the water, reaching the sandy sea bottom. On the sea bottom there are a few rocks.

What approach is AQUAPHOENIX taking to nutrient management?

ArticlesSeptember 12, 2025

AQUAPHOENIX is funded under a European Union call for projects that work to bring Nitrogen and Phosphorus (N+P) emissions within safe ecological boundaries. Below, we explore this challenge and how AQUAPHOENIX is answering the call by managing N+P emissions from aquaculture, protecting marine health, and recycling aquaculture waste. The role of Nitrogen and Phosphorus in…

Issue 1: June 2025

NewslettersJune 27, 2025

AQUAPHOENIX is a four-year EU-funded project working to capture and reuse aquaculture waste. We apply novel approaches to clean aquaculture and help advance the transition toward a Zero Pollution Europe. IN THIS EDITION Welcome: Ryan Weber AQUAPHOENIX Reads On the Rise: Media Coverage In Rotation: Activities & Outreach Coming Up: Events Closing the Loop: Sister…

Author page: Anna Spiessens

Anna Spiessens

The path to clean aquaculture in the Baltic Sea

The many uses of sludge: how AQUAPHOENIX partners convert “waste” into resources

Aquaculture’s role in the circular economy

In light of Hardangerfjord report, sludge management is key for sustainable growth

First phase of testing AQUAPHOENIX technology in Åland complete

AQUAPHOENIX researchers conduct first seafloor sampling in Hardangerfjord

Meet the scientists measuring the environmental impact of clean aquaculture

What approach is AQUAPHOENIX taking to nutrient management?

Issue 1: June 2025

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