[Gerlanet] Fræðsluerindi á Keldum. Brian Austin. The use of probiotics and medicinal plants for the control of diseases in aquaculture.

[Sigurður H. Richter]

Fræðsluerindi á vegum Tilraunastöðvar Háskóla Íslands í meinafræði að
Keldum.

 

Þessi póstur er sendur tengiliðum við stofnanir, fyrirtæki, félög og hópa,
til að kynna fræðsluerindi sem haldin eru á Tilraunastöðinni að Keldum.
Vinsamlegast áframsendið með tölvupósti eftirfarandi upplýsingar til ykkar
fólks.

 

Fyrirlesari: Prófessor Brian Austin örverufræðingur, forstöðumaður Institute
of Aquaculture, University of Stirling, Skotlandi.

Heiti erindis: The use of probiotics and medicinal plants for the control of
diseases in aquaculture.

 

Erindið verður haldið fimmtudaginn 8. apríl, kl. 12:20 á Tilraunastöð
Háskóla Íslands í meinafræði að Keldum.

 

The control of fish diseases include the use of inhibitory compounds,
vaccines, immune­stimulants, medicinal plants, and probiotics.  Probiotics,
which are regarded as live or dead micro-organisms or their products with
health benefits to the host, are steadily gaining use in aquaculture for
disease control, supplementing or even in some cases (e.g. in Ecuador)
replacing the use of antimicrobial compounds. A wide range of microalgae
(Tetraselmis suecica), yeasts (Debaryomyces, Phaffia and Saccharomyces) and
Gram-positive, i.e. Bacillus, Carnobacterium, Enterococcus, Lactobacillus,
Lactococcus, Micrococcus, Strepto­­coccus and Weissella, and Gram-negative
bacteria, namely Aeromonas, Altero­monas, Photo­rhodobacterium, Pseudomonas
and Vibrio, has been evaluated for use in aquaculture, world­wide, with
success reported in finfish and shellfish culture. However, the mode of
action of the probiotics is incompletely understood, with the likely
possibilities including competitive exclusion, i.e. the probiotics actively
interfere with the colonization of potential pathogens in the digestive
tract by antibiosis or by competition for nutrients, oxygen and/or space,
alteration of microbial metabolism, and/or by the stimulation of the innate
immune response, such as enhanced phagocytic activity and lysozyme
production. It remains to be resolved whether the probiotics need to be
administered as live preparations or whether inactivated material would
suffice. Some probiotics stimulate appetite, and improve nutrition by the
production of vitamins, detoxification of compounds in the diet, and by the
breakdown of indigestible components. There is accumulating evidence that
probiotics are effective at inhibiting a wide range of fish pathogens,
including bacteria and parasites. Some probiotics confer herd immunity,
conferring protection against a range of diseases.

            In Asia, including China and India, there is evidence that
medicinal plants confer health benefits when used as dietary supplements.
As a result of a recent comparative study, the value of garlic, ginger,
lupin, mango and stinging nettle was highlighted.  When dosed on food at
0.5-2.0% and fed to rainbow trout for 14 days, there was evidence of
resistance to challenge by Aeromonas hydrophila with the mode of action
including stimulation of the innate immune response.

 

______________________________________________________________

 

Sigurður H. Richter

Tilraunastöð H.Í. í meinafræði að Keldum

Símar 585 5100 og 896 5811

Tölvupóstfang  shr at hi.is

 

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