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| Registros recuperados: 19 | |
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| Ingerslev, Hans-Christian; Boye, Mette; Dalsgaard, Inger; Madsen, Lone. |
| Poster abstract from ISME14: Fish provide an excellent model for studying the gut microbiota. During the very first life stage of most fish species nutrition only comes from a yolk sac originating from the egg and not from external feed sources. During this larval phase the intestine is being formed and becomes functional as the amount of yolk sac protein is used up and feeding from external sources slowly takes over. Thus, studying the intestine in this developmental window is useful for examining the influence of feeding on the gut microbiota dynamics. In this study we examined this in the commercially produced species rainbow trout (Oncorhynchus mykiss) using next-generation sequencing. The examined fish were reared in re-circulated freshwater... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2012 |
URL: http://orgprints.org/21753/3/21753.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Boye, Mette; Madsen, Lone. |
| Regnbueørred er den dominerende produktionsfisk i Dansk akvakultur, og der produceres årligt ca. 30.000 tons i ferskvandsopdræt. I de senere år er der igangsat produktion af økologiske fisk og mængden er stigende. I produktionen af økologiske regnbueørreder i akvakultur er der en øvre begrænsning på to behandlinger med antibiotika i tilfælde af sygdomsudbrud – hvis flere er nødvendige, kan fisken ikke længere sælges som værende økologisk. Derfor er der udfordringer i at undgå, at fiskene bliver syge, bl.a. ved at sørge for, at de får optimalt foder, som styrker deres immunforsvar og dermed evne til at modstå sygdom. Dette undersøges nu nørmere i Organic RDD projektet, OPTIFISH. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2012 |
URL: http://orgprints.org/22094/7/22094.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Boye, Mette; Madsen, Lone. |
| Abstract from a DAFINET workshop: For many years it has been known that the bacterial microflora in the gut of warm-blooded animals live in harmony with the host and exert various beneficial effects on the health by their metabolic activities. Hence, the gut microbiota has a high importance for the animal. In many studies from e.g. humans and the pig mapping of the bacterial flora from the gut have shown dominance by some specific bacterial groups, and this bacterial profile is termed as a ‘core microbiota’. For lower vertebrates like fish mapping of the bacterial flora in the gastrointestinal system is to date a relatively new research field and previous studies have mainly been done on bacterial species that can be cultured or by classical molecular... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2012 |
URL: http://orgprints.org/21751/3/21751.pdf |
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| Madsen, Lone; Dalsgaard, Inger. |
| High mortalities among rainbow trout (Oncorhynchus mykiss) fry are often the result of infections caused by Flavobacterium psychrophilum, and in Denmark this pathogen can be found in nearly all freshwater fish farms. The infection can be treated with antibiotics, but lower sensitivity against the infection is an increasing problem for some of the used drugs, wherefore alternative treatment methods (e.g. bacteriophages) are investigated. Prophylactic measures (e.g. feed additives) are another approach, so infections with the bacterium can be avoided, before they become a problem. No matter if the focus is on prophylactic or alternative treatment, reliable infection models are needed to evaluate the treatments as well as to get more knowledge about... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2015 |
URL: http://orgprints.org/29137/7/29137.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Jørgensen, Louise von Gersdorff; Madsen, Lone. |
| In recent years it has become more and more evident that the bacterial flora in the gut of warm-blooded animals modulates physiological processes and the immunological status of the host. Besides effects on growth parameters, commensal intestinal bacteria balance the immune system and prevent colonization of pathogenic bacteria. The question is if the gut microbiota is also important in lower vertebrates such as fish? Is the microbiota related to the diet type and does it play a protective role in connection to pathogenic challenge? To examine these questions rainbow trout fry were fed two different diets of either a marine or vegetable origin from first feeding and onwards. At a size of about four gram the fish were bath challenged by Yersinia ruckeri... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare; Denmark. |
| Ano: 2013 |
URL: http://orgprints.org/24227/9/24227.pdf |
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| Madsen, Lone; Dalsgaard, Inger. |
| High mortalities among rainbow trout (Oncorhynchus mykiss) fry are often the result of infections caused by Flavobacterium psychrophilum, and in Denmark this pathogen can be found in nearly all freshwater fish farms. The infection can be treated with antibiotics, but lower sensitivity against the infection is an increasing problem for some of the used drugs, wherefore alternative treatment methods (e.g. bacteriophages) are investigated. Prophylactic measures (e.g. feed additives) are another approach, so infections with the bacterium can be avoided, before they become a problem. No matter if the focus is on prophylactic or alternative treatment, reliable infection models are needed to evaluate the treatments as well as to get more knowledge about... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Production systems; Health and welfare; Aquaculture; Denmark. |
| Ano: 2015 |
URL: http://orgprints.org/30002/1/Abstract%20Madsen%20and%20Dalsgaard%20Flavobacterium%202015.pdf |
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| Madsen, Lone; Ingerslev, Hans-Christian; Boye, Mette; Dalsgaard, Inger. |
| Feed for rainbow trout aquaculture has traditionally been based on marine resources such as fish meal and fish oil. Because of a shortage of marine resources as well as the growing production of farmed fish, the feed industry has been forced to partially exchange fish meal protein with proteins derived from plants, like soy bean meal. This has been shown to affect the salmonid intestinal mucosa, and in addition, plant-based dietary proteins have been associated with changes in disease susceptibility in salmon and it has been suggested that these special diet types weakens the immune status of the fish. One major cause for losses in Danish freshwater fish farms is the fry disease rainbow trout fry syndrome (RTFS), caused by the bacterium Flavobacterium... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2014 |
URL: http://orgprints.org/27338/6/27338.pdf |
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| Ingerslev, Hans-Christian; Strube, M. Lenz; Jørgensen, Louise von Gersdorff; Dalsgaard, Inger; Boye, Mette; Madsen, Lone. |
| This study investigated the influence of the rainbow trout (Oncorhynchus mykiss) commensal intestinal microbiota in connection to an experimental Yersina ruckeri infection, the causative agent of enteric redmouth disease. One marine and one plant diet was administered to two different groups of rainbow trout. The plant-based diet gave rise to an intestinal microbiota dominated by the genera Streptococcus, Leuconostoc and Weissella from phylum Firmicutes whereas phylum Proteobacteria/Bacteroidetes/Actinobacteria dominated the community in the marine fed fish. In connection to the Y. ruckeri bath challenge there was no effect of the diet type on the cumulative survival, but the number of Y. ruckeri positive fish as measured by plate count and the number of... |
| Tipo: Journal paper |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2014 |
URL: http://orgprints.org/27356/7/27356.pdf |
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| Madsen, Lone; Dalsgaard, Inger. |
| A challenge for sustainable rainbow trout production is an increasing use of plant sources in fish feed due to shortage of marine protein and oil sources. Diets with high plant content are known to cause enteritis and injury to the intestine, which will affect the absorption of nutrients, affecting the overall health status and welfare of the fish. The result is a higher risk of disease following exposure to pathogenic microorganisms. The aim of this study was to elucidate how different feed types with varying amounts of marine versus organic plant protein and oil sources affected the survival of rainbow trout in connection with an infection. Enteric redmouth disease caused by Yersinia ruckeri is an economically important disease which causes problems in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Health and welfare; Farm nutrient management. |
| Ano: 2010 |
URL: http://orgprints.org/18314/1/18314.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Boye, Mette; Madsen, Lone. |
| Rainbow trout (Oncorhynchus mykiss) is the dominant fish species in Danish aquaculture and the production is yearly about 40.000 tons. Freshwater accounts for about 75% of the production, while the remaining comes from seawater. During the last few years an organic fish production has been initiated and the rates of farmed organic fish are continuously increasing. Antibiotic treatment is only allowed a limited number of times during the entire life of an organic fish and if more treatments are needed the fish must be sold with the status of being conventionally raised. Thus it is a challenge to prevent disease outbreaks, e.g. by feeding with diets providing optimal health for the fish by strengthening their immune system or the composition of the gut... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2014 |
URL: http://orgprints.org/27337/6/27337.pdf |
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| Madsen, Lone; Ingerslev, Hans-Christian; Boye, Mette; Dalsgaard, Inger. |
| The aim of the Danish project OPTIFISH is to optimize growth and survival for organic cultured rainbow trout, the dominant fish species produced in Denmark. Currently there is no production of organic fry, as the classification organic only can be given to fish that have not been treated with antibiotics more than twice in a lifetime. This is hard to achieve as recurrent disease outbreaks, especially with the bacterium Flavobacterium psychrophilum, are seen during the fry stage. A further challenge is that diets with high plant contents cause enteritis and injury to the intestine, which in the end will affect the overall health status of the fish and result in a higher risk of disease following exposure to pathogenic microorganisms. OPTIFISH investigates... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2012 |
URL: http://orgprints.org/21750/3/21750.pdf |
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| Madsen, Lone; Ingerslev, Hans-Christian; Boye, Mette; Dalsgaard, Inger. |
| Extended abstract published from the conference Flavobacterium 2012. The aim of the Danish project OPTIFISH is to optimize growth and survival for organic cultured rainbow trout. OPTIFISH investigates how organic vs. non-organic diet types as well as diets with or without probiotics affect the intestine, the intestinal microbiota and survival rates of rainbow trout following exposure to pathogens. The project consists of several work packages, among them the backbone of the project, namely the feed experiments with fry as well as sampling from the different diet groups. The samples will be used for studies of the bacterial microbiota in the fish by e.g. traditional bacteriology and molecular methods (16S rRNA PCR combined with next generation... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2012 |
URL: http://orgprints.org/21748/4/21748.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Jørgensen, Louise von Gersdorff; Madsen, Lone. |
| In warm-blooded animals such as humans and pigs the intestinal microbial composition is dependent on the type of ingested diet. It is known that it also influences the immune system and prevent colonization of pathogenic bacteria. The question is if the gut microbiota has the same impact in lower vertebrates such as fish? To examine this rainbow trout fry were fed two different diets of either a marine or vegetable origin. At a size of about four gram a subset of the fish was bath challenged by Yersinia ruckeri serotype O1 and intestines were then sampled 5 days post challenge from challenged fish (n = 40) and non-challenged control fish (n = 40). Subsequent metagenomic examination based on the 16S rDNA gene was then performed using the Illumina HiSeq... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare; Denmark. |
| Ano: 2013 |
URL: http://orgprints.org/24228/3/24228.pdf |
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| Madsen, Lone; Ingerslev, Hans-Christian; Dalsgaard, Inger; Boye, Mette; Buchmann, Kurt; Chettri, Jiwan K.; Jørgensen, Louise von Gersdorff; Lauritsen, Anne Hjørngaard; Henriksen, Niels Henrik. |
| With respect to rainbow trout, the OPTIFISH project has shown that feed composition is more important than whether the feed are of organic or conventional origin. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2015 |
URL: http://orgprints.org/28102/6/28102.pdf |
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| Jokumsen, Alfred; Larsen, Villy J.; Dalsgaard, Inger; Nielsen, Henrik Hauch; Jessen, Peter; Kold, John. |
| Dansk Akvakultur's målsætning for udviklingen inden for økologisk fiskeopdræt frem mod år 2015 er, at 1. Mindst 10% (10.000 tons) af produktionen skal være økologisk 2. Eksportandelen heraf skal være på mindst 50% 3. Der opdrættes mindst tre forskellige økologiske arter 4. Den samlede forskningsindsats i økologi er på mindst 3% af primæromsætningen 5. Senest i 2007 er der etableret et fælles europæisk regelsæt 6. Danmark er EU's førende producent af økologisk fiskefoder Formålet med denne vidensyntese er at identificere de væsentligste indsatsområder af betydning for den målsatte udvikling af økologisk fiskeopdræt i Danmark, herunder en sammenfatning af den eksisterende viden om økologisk fiskeopdræt såvel nationalt som i det øvrige Europa.... |
| Tipo: Report |
Palavras-chave: Farm nutrient management; Denmark. |
| Ano: 2006 |
URL: http://orgprints.org/13511/1/13511.pdf |
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| Ingerslev, Hans-Christian; Dalsgaard, Inger; Jørgensen, Louise von Gersdorff; Madsen, Lone. |
| In recent years it has become more and more evident that the bacterial flora in the gut of warm-blooded animals modulates physiological processes and the immunological status of the host. Besides effects on growth parameters, commensal intestinal bacteria balance the immune system and prevent colonization of pathogenic bacteria. The question is if the gut microbiota is also important in lower vertebrates such as fish? And does it play a role in connection to pathogenic challenge? To examine these questions rainbow trout fry were fed two different diets of either a marine or vegetable origin directly after first feeding. At a size of about four gram the fish were bath challenged by Yersinia ruckeri and intestines were then sampled 5 and 18 days post... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Feeding and growth; Health and welfare. |
| Ano: 2013 |
URL: http://orgprints.org/24806/3/24806.pdf |
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| Registros recuperados: 19 | |
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