LaMuOpt: “Holistic use of Laminaria- and mussel by-products to optimize fish farming and products for human consumption”

Project within the innovation space BaMS – Bioeconomy on marine sites

Contact Person

Dipl.-Biol. Verena Sandow
Dipl.-Ing. Susanne Woldmann

Project description

Fish, seafood and algae are cultivated for human consumption by aquaculture. They are used as food, dietary supplements, in cosmetics, pharmaceuticals and medicine. However, the organisms grown are often only partially used.
In the production and further processing of animals and plants, so-called by-pass products arise. This is a technical term for “products”, or better said “leftovers”, which mostly end up in the garbage. The quantities involved are not inconsiderable, with up to 15% bypass products per production.
The project is now aiming to use these by-products as well and thus make the farms and production facilities more ecological and economical by creating new products that can be used economically.
In the mussel harvest z. B. undersized mussels of a mussel farm – d. H. Mussels that are too small to be eaten are usually simply given back into the sea. In the production of algae extracts, a large part of the algae is always left over as unused algae pomace.
Both algae mesh and mussel meal, which can be made from undersized mussels, on the one hand offer great potential in land-based recirculation systems as a fish feed component; on the other hand, these side stream products are also to be developed as innovative ingredients for human consumption.
Land-based recirculation systems, integrated multitrophic cultures close to the coast, as well as consumers of algae, fish and mussel products benefit from the results of this project.

The part of CRM is to process the pomace resulting from the production of algae extract so that it can be used for fish feed and / or human consumption (e.g. in the form of an algae pesto).
This includes the analysis of the marc with regard to nutrient and pollutant levels. On the basis of this analysis, the process for producing the marc can then be adapted so that an optimal nutrient profile for use in fish feed or food is achieved. In addition, the material must be physically adapted in such a way that it is functional for the respective area of ​​application. So z. B. the grain size and residual moisture content can be optimized.
In the autumn of this year (2021), the first fish feeding trials will take place at the GMA (Society for Marine Aquaculture) in Büsum with algae-based fish feed.

Task of CRM

Preparation and analysis of algae pomace for use as fish feed and for human consumption



Bundesministerium für Bildung und Forschung


May 2020 to April 2022

Project partner

  • Fraunhofer Institute for Marine Biotechnology and Cell Technology Lübeck (project management)
  • Christian Albrechts University in Kiel
  • Society for Marine Aquaculture (GMA) Büsum