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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03494

    Preliminary investigation of an idiopathic muscle disease in farmed burbot Lota lota

    Constanze Pietsch*, Fridolin Tschudi, Stefan Baumann, Heike Schmidt-Posthaus

    *Corresponding author:

    ABSTRACT: The rearing of less established fish species in recirculating aquaculture systems (RASs) is increasing, but may require adaptations of the rearing facilities if health impairments occur. The present study observed several health issues in burbot Lota lota reared for up to 2 yr in a RAS, which were the reason for use of microbiological, histological and molecular-biological methodsto identify causative agents. Small trauma to the skin led to the development of ulcers. In addition, several fillets of burbot showed pronounced granulomatous inflammation and calcification with signs of muscle fibre degeneration which resembled a condition called ‘sandy fillet syndrome’ in North American walleye. Several infectious agents were able to be excluded as a cause for the syndrome. Carnobacterium maltaromaticum was isolated in high numbers in some of the affected muscle tissue. However, the role of this bacterium or other causative agents or husbandry conditions remain to be elucidated.