Aquaculture for all

Can algae and fish waste be the next flexitarian superfoods?

Consumer Seaweed / Macroalgae Microalgae +6 more
four people in a laboratory
Investigating the creation of hyrbrid foods that include fish byproducts and algae

Pictured are Liv Sickel, Åge Oterhals, Tone Aspevik and Tor Andreas Samuelsen © Helge Skodvin, Nofima.

A new project is looking at making hybrid food products that combine seaweed, microalgae, insect meal and/or fish byproducts with protein rich plant ingredients.

Key byproducts being examined include fish heads and bones which are otherwise discarded or used in low value feed products. The researchers will also try to improve the texture and nutritional profile of plant products by adding seaweed, microalgae and insect larvae – raw materials that are towards the bottom of the food chain or would have gone to waste.

Åge Oterhals a senior scientist at Nofima is leading the HybridFoods project and is working to develop nutritious products that have a fibrous meat structure by using new processes and extrusion technology.

“By using raw materials that have been processed as little as possible and in the best possible way, we will be able to reduce the energy consumption and achieve a better fibrous structure and juicier products,” said Oterhals in a press release.

But why start mixing animal ingredients into things if you are making a product that is first and foremost plant-based?

“Plant proteins do not have an optimal composition of nutrients, but this can be improved by adding fish and chicken byproducts, insects, seaweed and algae. In other words, a product adapted for flexitarians. We will also find out if these raw materials can improve texture, taste and smell,” said Oterhals.

Such products may be of interest to people who are concerned about reducing their consumption of red meat and minimising the environmental footprint of the food they eat.

Improving fish waste quality

The idea to develop hybrid products came about when Oterhals was conducting research on fishmeal. His aim was to find alternative utilisation of heads and spines that were left over on board fishing trawlers after the fish had been gutted and the fillets frozen. In Norway alone, as much as 80,000 tonnes of this raw material is discarded each year, but it can be a valuable food source. In collaboration with the fishing industry, scientists have now made an improved and more neutrally tasting powder from this raw material, and it has a high nutritional content.

It soon became clear that this whitefish powder can be combined with plant proteins in meat analogue products. The scientists want to develop a broader palette of raw materials, without all of them having to be included in the same product at the same time.

“There is a lot of interest in this type of product development, especially in Europe. What distinguishes our idea from most others is that we try to combine plant protein characteristics with other sustainable raw materials in the texturisation process,” said Oterhals.

Texturisation is a method in which a dough is processed and kneaded in an extruder during heat treatment, before coming out through a cooling nozzle where a fibrous meat-like structure is formed.

“This technology provides good opportunities to improve texture and sensory characteristics, so we will try to achieve this,” explained Oterhals.

Testing taste, nutritional quality and environmental effect

Nofima has specialised infrastructure and expertise for processing raw materials to be used in formulated food products. Texture and sensory characteristics such as taste and smell are evaluated by Nofima’s trained judges in the sensory laboratory.

Scientists at the University of Bergen (UoB) will evaluate the nutritional quality and bioactivity of new products developed in the project, while the Norwegian School of Economics (NHH) in Bergen will evaluate environmental and social impacts based on life cycle assessments and cost-benefit analyses.

HybridFoods is a project funded by the Research Council of Norway, running from 2021 to 2025. Partners include the Department of Clinical Medicine at UoB, the Centre for Applied Research at NHH, Wageningen University (The Netherlands), and a broad team of Nofima scientists.

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