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Caldicellulosiruptor saccharolyticus as a potential fish feed

Lindh, Helena LU (2017) KMB820 20162
Applied Microbiology
Biotechnology
Abstract
Every second fish consumed by humans today is produced in aquaculture, and the main protein source in the fish feed is fishmeal. For every farmed salmonid, 1.8 fish are used in that fish’s feed. Hence, there is a great need of alternative protein sources to make aquaculture sustainable. The bacterium Caldicellulosiruptor saccharolyticus, used experimentally for hydrogen production, has a protein content almost as high as fishmeal and might be a good alternative. After the hydrogen production, C. saccharolyticus could be utilized as bacteria meal, which also would increase the value in the hydrogen production.
This project examined the nutritional ability and environmental profitability of partly replacing fishmeal with bacteria meal made... (More)
Every second fish consumed by humans today is produced in aquaculture, and the main protein source in the fish feed is fishmeal. For every farmed salmonid, 1.8 fish are used in that fish’s feed. Hence, there is a great need of alternative protein sources to make aquaculture sustainable. The bacterium Caldicellulosiruptor saccharolyticus, used experimentally for hydrogen production, has a protein content almost as high as fishmeal and might be a good alternative. After the hydrogen production, C. saccharolyticus could be utilized as bacteria meal, which also would increase the value in the hydrogen production.
This project examined the nutritional ability and environmental profitability of partly replacing fishmeal with bacteria meal made of C. saccharolyticus in fish feed for salmonids (i.e. different species in the Salmonidae family) in three perspectives. Firstly, the amino acid profiles of a hypothetical feed containing different amounts of C. saccharolyticus were theoretically compared with a reference feed and the requirements for different salmonids. It showed that it might be possible to replace fishmeal with up to 30% of bacteria meal for salmonids, but feeding trials are needed to determine the real value. Secondly, the potential toxicity of residues in the bacteria from the hydrogen production was considered, but only negative results were received. Finally, an environmental investigation was made, comparing the carbon footprint for fishmeal production and a hypothetical bacteria meal production process. The carbon footprint for bacteria meal could be reduced to 15% of the footprint for fishmeal, and a feed based on 30% C. saccharolyticus could lower the feed’s carbon footprint by 20%. (Less)
Popular Abstract (Swedish)
Varannan fisk som äts av människor är odlad. De odlade fiskarna äter fiskfoder som till största delen består av fiskmjöl. Fiskmjöl är en bra proteinkälla i fiskarnas mat, men bidrar till överfiske och rubbar havens ekosystem. Därför har en annan proteinkälla undersökts, nämligen bakterien Caldicellulosiruptor saccharolyticus. Denna bakterie har högt proteininnehåll och kan odlas i labb genom att matas med vetehalm, som är en biprodukt från jordbruken. Dessutom producerar den vätgas, som är en viktig framtida energikälla. Genom att undersöka proteininnehållet i fiskmjöl och jämföra det med proteininnehållet i C. saccharolyticus har det visat sig att det kan gå att ersätta nästan en tredjedel av fiskmjölet som används i fiskfoder för... (More)
Varannan fisk som äts av människor är odlad. De odlade fiskarna äter fiskfoder som till största delen består av fiskmjöl. Fiskmjöl är en bra proteinkälla i fiskarnas mat, men bidrar till överfiske och rubbar havens ekosystem. Därför har en annan proteinkälla undersökts, nämligen bakterien Caldicellulosiruptor saccharolyticus. Denna bakterie har högt proteininnehåll och kan odlas i labb genom att matas med vetehalm, som är en biprodukt från jordbruken. Dessutom producerar den vätgas, som är en viktig framtida energikälla. Genom att undersöka proteininnehållet i fiskmjöl och jämföra det med proteininnehållet i C. saccharolyticus har det visat sig att det kan gå att ersätta nästan en tredjedel av fiskmjölet som används i fiskfoder för laxfiskar med bakterier istället. Dessutom skulle en sådan ändring innebära att koldioxidutsläppen minskade med en femtedel. För att faktiskt kunna göra fiskmat av bakterier behöver nu bakterierna testas för att utesluta att de är giftiga. Och för att se att fiskarna vill äta dem så klart. (Less)
Please use this url to cite or link to this publication:
author
Lindh, Helena LU
supervisor
organization
course
KMB820 20162
year
type
H1 - Master's Degree (One Year)
subject
keywords
applied microbiology, tillämpad mikrobiologi
language
English
id
8933108
date added to LUP
2018-02-19 15:04:50
date last changed
2018-02-19 15:04:50
@misc{8933108,
  abstract     = {Every second fish consumed by humans today is produced in aquaculture, and the main protein source in the fish feed is fishmeal. For every farmed salmonid, 1.8 fish are used in that fish’s feed. Hence, there is a great need of alternative protein sources to make aquaculture sustainable. The bacterium Caldicellulosiruptor saccharolyticus, used experimentally for hydrogen production, has a protein content almost as high as fishmeal and might be a good alternative. After the hydrogen production, C. saccharolyticus could be utilized as bacteria meal, which also would increase the value in the hydrogen production. 
This project examined the nutritional ability and environmental profitability of partly replacing fishmeal with bacteria meal made of C. saccharolyticus in fish feed for salmonids (i.e. different species in the Salmonidae family) in three perspectives. Firstly, the amino acid profiles of a hypothetical feed containing different amounts of C. saccharolyticus were theoretically compared with a reference feed and the requirements for different salmonids. It showed that it might be possible to replace fishmeal with up to 30% of bacteria meal for salmonids, but feeding trials are needed to determine the real value. Secondly, the potential toxicity of residues in the bacteria from the hydrogen production was considered, but only negative results were received. Finally, an environmental investigation was made, comparing the carbon footprint for fishmeal production and a hypothetical bacteria meal production process. The carbon footprint for bacteria meal could be reduced to 15% of the footprint for fishmeal, and a feed based on 30% C. saccharolyticus could lower the feed’s carbon footprint by 20%.},
  author       = {Lindh, Helena},
  keyword      = {applied microbiology,tillämpad mikrobiologi},
  language     = {eng},
  note         = {Student Paper},
  title        = {Caldicellulosiruptor saccharolyticus as a potential fish feed},
  year         = {2017},
}