Influence of probiotics and feed on organic rainbow trout health

  • Madsen, Lone (Project Manager)
  • Dalsgaard, Inger (Contact Person)
  • Buchmann, Kurt (Contact Person)
  • Larsen, Anne Hjørngaard (Contact Person)
  • Henriksen, Niels Henrik (Contact Person)

    Project Details

    Description

    The aim of OPTIFISH is to optimize growth and survival for organic cultured rainbow trout, the
    dominant fish species produced in Denmark. A minor part of the rainbow trout is produced as
    organic fish. Currently there is no production of organic fry, as the classification organic only can be
    given to fish that have been treated with antibiotics no 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 known from salmon culture is that diets with high
    plant contents 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. OPTIFISH will investigate how organic diet types
    with varying amounts of fish and plant sources as well as with or without probiotics (lactic acid
    bacteria) will affect the intestine, the intestinal microbial flora and survival rates of rainbow trout
    following exposure to pathogens. The use of probiotics for fry are assumed to result in a higher health
    level. The overall result will be a sustainable production with an optimal utilization of the available
    organic ressources as well as the scope for the industry that they by using the optimal diet type will
    achieve a robust and healthy fish, something that can be achieved not only in organic but also in
    traditional farming. A robust and disease-free fry is the most important factor for a higher production
    in organic aquaculture in the future.
    AcronymOPTIFISH
    StatusFinished
    Effective start/end date11/01/200130/06/2014