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Feasibility and potential for farming and conditioning of wild fish fed with by-catches in Sweden

Östman, Örjan and Fjälling, Arne and Ovegård, Maria and Lunneryd, Sven-Gunnar and Röcklinsberg, Helena and Gräns, Albin and Vidakovic, Aleksandar and Kiessling, Anders (2021). Feasibility and potential for farming and conditioning of wild fish fed with by-catches in Sweden. (NL, NJ) > Department of Aquatic Resources
(VH) > Dept. of Animal Environment and Health
(VH) > Dept. of Animal Nutrition and Management, Sveriges lantbruksuniversitet. Aqua reports ; 2021:9
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Abstract

Small-scale fisheries face problems with declining fish stocks in poor condition, increasing interactions with seals and cormorants and partly non-efficient distribution systems, resulting in low profitability. One potential method to increase the value of their catch is rear the fish in farms until fish reach a size that render a higher price. This may not only provide a higher value of each animal but also a steadier supply of fish to consumers and retailers. In addition, by-catch of unwanted species may be used as feed ingredient to the farmed fish. This will not only cut the costs for the feed but is also a more sustainable alternative as it will both make use of by-catches that otherwise is discarded, and recirculate nutrients on a regional scale instead of importing new nutrients. Farming of wild caught fish and shellfish (grow-out or capture-based aquaculture) constitute a large part of aquaculture on a global scale. Except for eel is this type of aquaculture still limited in Sweden and Europe, with relatively little development. Here we make an overview of species that could be interesting for farming of wild caught fish, and identify benefits and challenges. The species we find most suitable for further development are cod, perch, whitefish, pike and pikeperch for which we can identify evident benefits of farming. In common for all these species is the need for an efficient feed system to ensure early and rapid weight gain and minimizing initial mortality. We speculate that a feed based on insect larvae could be one way to improve the feeding system for several species of wild caught fish. However, there are ethical and welfare issues related to farming wild born fish. As wild caught fish are not domesticated for life in captivity they can suffer from distress and increased susceptibility and transmissions of disease. Safeguarding the health and welfare of fish in capture-based aquaculture is a key to making it economically feasible, as an increased value for the end-consumers is necessary to compensate the fishermen for the additional costs associated with farming of wild caught fish. In addition, removal of wild fish may also impede natural stock size and recruitment of the natural stocks. Although our aim is to develop a farming system where local by-catches is used as a feed ingredient, local eutrophication effects and water pollutions (feed and fish residues) can cause degradation of local water quality. In conclusion, we find potential for farming of wild caught fish with local-by-catches as a feed ingredient. To be economically feasible there is a need for developing feeding systems, investigate stress responses and ethical and sustainability aspects important for marketing of such products.

Authors/Creators:Östman, Örjan and Fjälling, Arne and Ovegård, Maria and Lunneryd, Sven-Gunnar and Röcklinsberg, Helena and Gräns, Albin and Vidakovic, Aleksandar and Kiessling, Anders
Title:Feasibility and potential for farming and conditioning of wild fish fed with by-catches in Sweden
Series Name/Journal:Aqua reports
Year of publishing :2021
Number:2021:9
Number of Pages:29
Publisher:Department of Aquatic Resources, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-9872-8
Language:English
Publication Type:Report
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:Aquaculture, ethics, fish, fishers, law, sustainability
URN:NBN:urn:nbn:se:slu:epsilon-p-112636
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112636
ID Code:24791
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
VH - Faculty of Veterinary Medicine and Animal Science
Department:(NL, NJ) > Department of Aquatic Resources
(VH) > Dept. of Animal Environment and Health
(VH) > Dept. of Animal Nutrition and Management
Deposited By: SLUpub Connector
Deposited On:02 Jul 2021 15:25
Metadata Last Modified:02 Jul 2021 15:31

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