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Fish

Here you will find information about on-going and completed research projects on fish. The projects are listed in alphabetical order.

On-going

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    5 tons of green fish in the counter

    Red and gray fish in a fishing net. Photo. Eco-friendly gourmet fish are developed in collaboration between researchers, chefs and industry.
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    Alternative feed to fish - Bioactive components effect on metabolism and the gut micro flora

    Several rainbow troats under water surface. Photo. The aim of this PhD project is to gain a better understanding of how feeding of dietary supplements, derived from new and sustainable sources, affect nutrient uptake, metabolism and gene expression and the gut micro flora of rainbow trout.
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    Aquafresh - farmed fish as an excellent product for Swedish cuisine

    Trout on a plate. Photo. SLU together with Örebro University/Grythyttan, is now developing methodology to better understand how to improve farming of fish, not only for more environmentally friendly production with high animal welfare, but also to produce a raw material of the highest gastronomic quality.
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    Best anaesthesia protocol for fish species and situation

    Drawing: Fish with measuring equipment on the head There are over 30000 species of fish, living in a wide range of habitats. To treat ‘fish’ as one group is probably even less meaningful than to attempt to produce general guidelines for ‘mammals’. In this project, we will focus on three model species, i.e. zebrafish (Danio rerio), brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss), Representing fish in laboratory experiments, environmental monitoring, and aquaculture respectively.
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    Bio-conversion of non-food bio-resources to novel feeds for salmonids - a Nordic approach (NORDICFEED)

    Several rainbow troats under water surface. Photo. Nordic co-operation will improve the conditions for developing sustainable, microbial feed ingredients for salmonids produced on various residual products with the help of biotechnology.
  • Boosting the reproductive performance of Arctic charr using high-throughput sequencing technologies

    A fertilized char egg. Photo. The project will identify the main causes affecting male fertility and assess to which degree they explain the low reproductive performance in Arctic charr farmed in Sweden. Multiple parameters will be explored, such as age, sampling time during the spawning season, and genetics. Finally, we will analyze the possible effect of male reproductive dysfunctions on progeny using RNA sequencing.
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    Consumer acceptance and risk perception of insect-based aquafeed

    Larver av svart soldatfluga. Foto. Insects are increasingly considered as sustainable source of protein in fish feed, but what are the consumers' attitudes towards fish fed insects instead of conventional protein sources?
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    DigiHeart - Machine learning applied to predicting and preventing production loss in aquaculture

    Photo: A heart from rainbow trout Up to 20% of farmed salmonids die before reaching slaughter. This occurs during stressful situations such as delousing, deteriorating water quality, and transport. This is a serious welfare issue, and prevents a sustainable, ethical and economical growth of the Nordic aquaculture industry.
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    Fish farming in the North – a food production with environmental potential

    Open cage for fish farming in northern Seden with forest at the back. Photo. The project aims to investigate if and how rainbow trout and Arctic charr can be farmed sustainably in hydropower dams in northern Sweden from a biological, ecological, social and economical perspective. The project will last for five years and is a cooperation between SLU and external partners such as SVA, the industry organisation Matfiskodlarna, the hydropower industry and civil society via Landsbygdsnätverket.
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    Fish from ethanol residues

    Close up of fish feed. Photo. Project aim is to develop a sustainable protein source of high value for farmed fish, based on filamentous fungi grown on residues from ethanol production.
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    Germ-free and germ-associated experimental set-ups for rainbow trout larvae for nutraceuticals-gut microbiota interaction studies and beyond (TroLar)

    Rainbow trout larvae. Photo. The aim of this project is to develop a standardized germ-free and germ-associated rainbow trout larval model systems as a means to understand the interplay among novel nutraceuticals, defense system and gut microbiota with a focus to improve larval quality.
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    Germ-free Artemia test system, an in vivo toolbox for aquaculture and cross-disciplinary research

    An adult artemia fed with green microalgae. Photo. In a germ-free animal, nutritional (and other) processes can be studied without interference from the microorganisms commonly inhabiting the gut in a conventional environment. The extent to which that process is modified by microbial action can then be examined by introducing a known microflora. Such kind of gnotobiotic tools is now recognized as essential in the advancement of knowledge on various aspects of nutrition and health.
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    Green Valleys 2.0: Future Sustainable Fish Feed Made from Grass Protein

    A fish with open mouth sticking out of green water. Photo. This project is a continuation of the previous project, Green Valleys 1.0 (2018-2022), aiming to promote circular production of green protein (from green biorefinery) to create new business opportunities for the agriculture and aquaculture sectors.
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    Influence of environmental and host factors on the gut microbiome and lipid metabolism in salmonid fishes

    Two annual salmon on a table, one smolted and one unsmolted. Photo. The goal is to improve our understanding of the environmental impact and influence of host animal factors on intestinal microbiota and lipid metabolism in salmon.
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    LIVEFLY2fish - whole live black soldier fly in rainbow trout diets

    Larver av svart soldatfluga. Foto. In 2017, EU approved use of insects in fish feed. Wild salmonids and other fish naturally feed on insects throughout their lives. Feeding farmed fish with live insects could be environmentally friendly, and provide for nutrient requirements of the fish. This project will assess the feasibility of feeding whole black soldier fly larvae to rainbow trout.
  • Ökad resiliens för en hållbar odling av röding (ResiChar)

    Klimatförändringar utgör ett hot mot den hållbara tillväxten av odling av röding, som huvudsakligen bedrivs i öppna kassodlingar i kalla vattenområden i norra Sverige. Projektet ResiChar syftar till att stärka den svenska odlingen av röding och säkra den mot klimatförändringar och säkerställa hållbarheten i vattenbruksindustrin för röding både på kort och lång sikt. Projektet leds av SLU-forskare och genomförs tillsammans med Vattenbrukscentrum Norr AB, Svensk Fiskhälsa och Sepantech AB, och sträcker sig fram till april 2026 och finansieras av Jordbruksverket.
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    Physiological assessments for improved welfare of farmed fish

    Photo: Man is operating equipment into a fish. Several national and international studies have shown that the welfare of fish in aquaculture in many aspects is substandard. This is partly because it is difficult to assess fish stress, suffering and well-being as they lack many of the behaviors that signal negative stress, disease, pain and discomfort in other animal species.
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    Recapture of manure from open fish farming cages – the missing link for a circular system

    Person fixing with a fish farming bag in the water. Photo. The overall goal of the project is to develop a technical system for recovering manure and fodder residues from the cage-based aquaculture in Sweden.
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    SALMONAID

    Several rainbow troats under water surface. Photo. Fish feed for salmon from by-products from the forest industry
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    Screening for microbial biostimulants in aquaculture - a tool for resilient aquaponic systems

    Cultivation of salad using hydroponics in a greenhouse. Photo. Aquaponics, integrated systems for production of fish and plants, display an alternative for production of animal protein and health-promoting vegetables. Scaling up aquaponic systems for primary production requires increased knowledge about challenges in the system regarding e.g. nutritional balance with respect to the plants, plant and fish diseases, as well as quality of the product.
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    The welfare of farmed fish at the time of slaughter

    Photo: Catch rake with fish.
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    Tree to feed

    A jumping fish in  a fish enclosure. Photo. Can side streams from the paper industry contribute to fish feed of the future?

Completed

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    Alternative feed resources to marine- and fresh- water fish and giant prawn

    Shrimps in water. Photo. The aim of the project was to evaluate and compare the ability of using distilled brewer's yeast and microbe mixture to replace fish based protein meal in diets to the marine fish, Asian Sea Bass (Lates calcarifer) and to the fresh water fish, red tilapia (Oreochromis sp.) and the giant freshwater shrimp (Macrobrachium rosenbergii).
  • Aquaponic cultivation in the shadow of fish feed sources

    Cultivation of salad using hydroponics in a greenhouse. Photo. The main objective of the project is to gather SLU researchers from different disciplines to write a research proposal focusing on developing a sustainable aquaponic system including feed based on black soldier fly protein and oil, with single cell proteins and marine waste streams.
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    Baltic Blue Growth

    Close-up of mussels pulled out of the water. Photo. Baltic Blue Growth was an Interreg project that aimed to tackle Baltic Sea eutrophication through establishing operational mussel farms and securing viable solutions for the produced mussels.
Published: 19 December 2023 - Page editor: josefina.zidar@slu.se
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