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Kan musselextrakt (Mytilus edulis) inducera födosök hos omnivoren ruda, Carassius carassius (Linnaeus, 1758)?
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Does mussel meal extract (Mytilus edulis) induce foraging in the omnivorous species crucian carp, Carassius carassius (Linnaeus, 1758)? (English)
Abstract [en]

Over the last three decades there has been a significant increase in aquaculture production and the demand for farmed fish is predicted to rise further. More fish are being caught to become fishmeal in aquaculture, than for direct human consumption use, while a large number of fish stocks are being depleted. Many popular farmed species are carnivores and thus brought up on a diet consisting of fishmeal and fish oil. However, several studies have shown that several fish species can be brought up on a diet consisting of mussel meal instead of fishmeal. If so, this finding can possibly lead to a more sustainable fishing in the future by reducing the number of wild-caught fish. The purpose of this study has been to examine if mussel meal extract can induce foraging in the omnivorous species crucian carp (Carassius carassius), a commercial fish that is mainly farmed in China. Induced foraging can indicate that crucian carp could become accustomed to mussels, even though mussels are not part of its natural food source. The results revealed that foraging was induced in the crucian carp by conventional feed for carp, the control diet, but not by extract of mussels.

Abstract [sv]

Vattenbruket har ökat markant under de senaste tre decennierna och idag går mer fisk till foderproduktion för fiskodlingar än vad som konsumeras direkt av människan. Detta är problematiskt då många fiskbestånd är utarmade, samtidigt ökar efterfrågan på fisk. Många populära matfiskar är rovfiskar som huvudsakligen matas med fiskbaserat foder. Ett flertal studier har emellertid visat att flera fiskarter potentiellt kan födas upp på blåmusslor (Mytilus edulis) istället för fiskbaserat foder. Foder som huvudsakligen baseras på musslor kan därför i framtiden möjligen bidra till att minska överexploatering av fisk. Denna studie undersökte om musselextrakt kan inducera ett födosök hos omnivoren ruda (Carassius carassius), som idag odlas och används som matfisk framförallt i Kina. I så fall kan det indikera att ruda möjligen kan vänjas vid musslor, trots att det inte ingår i fiskens naturliga föda. Resultaten i studien visade att ett födosök inducerades hos ruda gentemot extrakt av vanligt karpfoder, kontrollsubstansen, men inte gentemot musselextrakt.

Place, publisher, year, edition, pages
2016. , p. 26
Keywords [en]
Musselmeal, Olfactory stimulation, Fish feed, Sustainable aquaculture, Sustainable development
Keywords [sv]
Luktstimulerande, Fiskfoder, Musselmjöl, Hållbart vattenbruk, Hållbar utveckling
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:sh:diva-31658OAI: oai:DiVA.org:sh-31658DiVA, id: diva2:1064002
Subject / course
Environment and development
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2017-01-12 Created: 2017-01-11 Last updated: 2017-01-12Bibliographically approved

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