Dairy waste - feed for fish?
Global meat production has increased dramatically in the last 50 years and along with this growth, aquaculture has made a rapid development, now comprising 14.3 % of all meat produced. The growing demand and desire for animal protein will become a real challenge in the future, seafood derived fro...
| Autor principal: | |
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| Formato: | First cycle, G2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2015
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| Acceso en línea: | https://stud.epsilon.slu.se/8356/ |
| _version_ | 1855571338891100160 |
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| author | Eliasson, Thomas |
| author_browse | Eliasson, Thomas |
| author_facet | Eliasson, Thomas |
| author_sort | Eliasson, Thomas |
| collection | Epsilon Archive for Student Projects |
| description | Global meat production has increased dramatically in the last 50 years and along with this
growth, aquaculture has made a rapid development, now comprising 14.3 % of all meat
produced. The growing demand and desire for animal protein will become a real challenge in
the future, seafood derived from aquaculture may be a partial solution, showing positive effects
on both undernourishment and obesity in humans. But as with other types of animal production,
the most demanding challenge is feed supply, there is always the risk of feed ingredients
competing with foods for human consumption. In 2008, from major groups of fish and
crustaceans cultured, 64.4 % of the production was dependent on external feeds, of which
ingredients based on fish and other water-living animals comprised 15.4 %. Further
investigations showed that there are major differences in feed consumption (both type of feed
and amount) between species due to a wide diversity within their digestive systems and nutrient
requirements. Single cell protein (SCP) is a feed source with major potential for aquaculture,
supported by the fact that fish and crustaceans possesses the ability to degrade nucleic acids
(purines) more efficiently than other animals. A short review based on 10 earlier studies where
fish meal was substituted by yeast SCP showed mixed positive and negative results on growth;
more research is needed. A goal of this study was to produce SCP from dairy wastewater by
fermentation with the yeast Kluyveromyces lactis, and in the process also improve the
wastewater for biogas production. The results showed that there may be a beneficial effect for
biogas production, whereas the SCP production was less promising. The biomass increased by
57.84 % (after 30 hours of fermentation), which is positive. Though, further analysis of the
pelleted biomass indicated a decreasing concentration of crude protein per kg dry matter. |
| format | First cycle, G2E |
| id | RepoSLU8356 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2015 |
| publishDateSort | 2015 |
| record_format | eprints |
| spelling | RepoSLU83562015-08-20T14:32:01Z https://stud.epsilon.slu.se/8356/ Dairy waste - feed for fish? Eliasson, Thomas Animal feeding Fisheries and aquaculture - General aspects Fisheries production Global meat production has increased dramatically in the last 50 years and along with this growth, aquaculture has made a rapid development, now comprising 14.3 % of all meat produced. The growing demand and desire for animal protein will become a real challenge in the future, seafood derived from aquaculture may be a partial solution, showing positive effects on both undernourishment and obesity in humans. But as with other types of animal production, the most demanding challenge is feed supply, there is always the risk of feed ingredients competing with foods for human consumption. In 2008, from major groups of fish and crustaceans cultured, 64.4 % of the production was dependent on external feeds, of which ingredients based on fish and other water-living animals comprised 15.4 %. Further investigations showed that there are major differences in feed consumption (both type of feed and amount) between species due to a wide diversity within their digestive systems and nutrient requirements. Single cell protein (SCP) is a feed source with major potential for aquaculture, supported by the fact that fish and crustaceans possesses the ability to degrade nucleic acids (purines) more efficiently than other animals. A short review based on 10 earlier studies where fish meal was substituted by yeast SCP showed mixed positive and negative results on growth; more research is needed. A goal of this study was to produce SCP from dairy wastewater by fermentation with the yeast Kluyveromyces lactis, and in the process also improve the wastewater for biogas production. The results showed that there may be a beneficial effect for biogas production, whereas the SCP production was less promising. The biomass increased by 57.84 % (after 30 hours of fermentation), which is positive. Though, further analysis of the pelleted biomass indicated a decreasing concentration of crude protein per kg dry matter. De sista 50 åren har den globala köttproduktionen ökat väldigt kraftigt. I anslutning till denna utveckling har aquakultur visat en mycket positiv tillväxt, idag utgör aquakultur 14,3% av allt kött producerat. Förutom ett ökat behov finns också en ökad efterfrågan på animaliskt protein vilket kommer bli en stor utmaning i framtiden. Produktion av livsmedel från aquakultur kan vara en del av lösningen på problemet då tydliga positiva hälsoeffekter visats, både när det gäller undernäring och övervikt. Men precis som med andra typer av djurproduktion utgör också fodret här en stor utmaning, det finns alltid en risk för konkurrens med human konsumtion. Tittar man på de mest odlade arterna av fisk och skaldjur 2008, var 64,4% av produktionen beroende av inköpt eller producerat foder. Fisk och andra vattenlevande organismer utgjorde då 15,4% av ingredienserna till dessa foder. Vidare undersökningar visade på stora skillnader i foderkonsumtion mellan de odlade arterna, både vad gäller typ och mängd av foder. Dessa skillnader visade sig bero på variationer inom både digestionsfysiologi och näringsbehov. Mikrobiellt protein utgör en foderkälla med stor potential inom aquakultur, detta baserat på att fisk och skaldjur bryter ned nukleinsyror (puriner) effektivare än andra djur. En kort genomgång av 10 tidigare studier där man testat att byta ut fiskmjöl mot mikrobiellt protein, visar både positiva och negativa effekter på tillväxt; mer forskning behövs dock. Ett av målen med denna studie var att undersöka möjligheten att producera mikrobiellt protein på mejeriavfall genom fermentering, med hjälp av jästarten Kluyveromyces lactis. Förutom att producera mikrobiellt protein, undersöks också om mejeriavfallet förbättrats med avseende på biogasproduktion. Resultaten tyder på att det kan vara en fördel för biogasutbytet medan produktionen av mikrobiellt protein verkar mindre lovande. Fermenteringen gav en ökning i biomassa på 57,84% (efter 30 timmar) vilket är positivt, vidare analyser av den pelleterade biomassan tyder dock på en minskad koncentration av råprotein per kg torrvikt. 2015-08-06 First cycle, G2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/8356/11/eliasson_t_150805.pdf Eliasson, Thomas, 2015. Dairy waste - feed for fish?. First cycle, G2E. Uppsala: (VH) > Dept. of Animal Nutrition and Management (until 231231) <https://stud.epsilon.slu.se/view/divisions/OID-650.html> urn:nbn:se:slu:epsilon-s-4735 eng |
| spellingShingle | Animal feeding Fisheries and aquaculture - General aspects Fisheries production Eliasson, Thomas Dairy waste - feed for fish? |
| title | Dairy waste - feed for fish? |
| title_full | Dairy waste - feed for fish? |
| title_fullStr | Dairy waste - feed for fish? |
| title_full_unstemmed | Dairy waste - feed for fish? |
| title_short | Dairy waste - feed for fish? |
| title_sort | dairy waste - feed for fish? |
| topic | Animal feeding Fisheries and aquaculture - General aspects Fisheries production |
| url | https://stud.epsilon.slu.se/8356/ https://stud.epsilon.slu.se/8356/ |