Mathiessen, Heidi; Al-Jubury, Azmi and Buchmann, Kurt (2021) Urteekstrakter som bæredygtigt bekæmpelsesmiddel mod parasitter i økologisk fiskeopdræt. [Herb extracts as sustainable tools to control parasites in organic fish farming.] ICROFS nyt, 16 August 2021, pp. 1-2.
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Summary
Opdræt af regnbueørred, særligt økologisk ørred, er udfordret på grund af gælle- og hudparasitinfektioner forårsaget af en række forskellige patogener. Det drejer sig især om mikroskopiske flagellater, fimredyr samt en række amøber. Da flere andre typer parasitter er følsomme over for indholdsstoffer i hvidløg, oregano og timian kunne ekstrakter fra disse krydderurter måske være en del af løsningen også for dambrugsfisk. Vore laboratorieforsøg viste, at fiskeparasitter faktisk var følsomme over for et eller flere indholdsstoffer i hvidløg, oregano og timian. Men det viste sig også, at det kun var timian og en biologisk sæbe fra bakterien Pseudomonas, som blev veltolereret af fiskene, mens ekstrakter af oregano og hvidløg ikke blev vel modtaget af regnbueørrederne. Timian-ekstrakt havde således antiparasitisk effekt, idet snylterne på fiskens hud døde og løsnedes fra både hud, finner og gæller. En andet stof, isoleret fra Pseudomonas H6 bakterien, som er en biologisk sæbe (en surfaktant, et overfladeaktivt molekyle), viste sig også at være effektiv mod flere typer parasitter.
Summary translation
Farming of rainbow trout, in particular organic trout, is challenged due to infections in gills and skin by various parasites. Mainly it concerns microscopic flagellates, ciliates and amoebae. Due to the fact that many other parasites are sensible to contents in garlic, oregano and thyme, one could suggest that extracts from these herbs might be a tool to control the parasitic infections in fish as well.
Laboratory experiments showed that the fish parasites actually were sensible to one or more contents in garlic, oregano and thyme. However, it also showed that only thyme, and a biological soap extracted from the bacteria Pseudomonas, were accepted by the fish, while extracts from oregano and garlic were not well accepted by the rainbow trout. Thus, extract from thyme showed anti-parasitic effect, as the parasites in skin, fins and gills died and loosened. Further, the biological soap extracted from the bacteria Pseudomonas also showed to be efficient against more types of parasites.
| EPrint Type: | Newspaper or magazine article |
|---|---|
| Keywords: | Rainbow trout, parasites, herb extracts, thyme, surfactant, Pseudomonas |
| Agrovoc keywords: | Language Value URI English UNSPECIFIED UNSPECIFIED |
| Subjects: | Crop husbandry > Production systems Animal husbandry > Health and welfare |
| Research affiliation: | Denmark > Organic RDD 4 > ShelterFish |
| Deposited By: | Jokumsen, Senior Advisory Scientist Alfred |
| ID Code: | 41873 |
| Deposited On: | 21 Sep 2021 07:18 |
| Last Modified: | 21 Sep 2021 07:18 |
| Document Language: | Danish/Dansk |
| Status: | Published |
| Refereed: | Not peer-reviewed |
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