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

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. We observed several health issues in burbot Lota lota reared for up to 2 yr in a RAS and used microbiological, hi...

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Bibliographic Details
Published in:Diseases of Aquatic Organisms
Main Authors: Pietsch, Constanze, Tschudi, Fridolin, Baumann, Stefan, Schmidt-Posthaus, Heike
Format: Article in Journal/Newspaper
Language:English
Published: Inter-Research 2020
Subjects:
Aquaculture
Rearing conditions
Sandy flesh disease
Skin alterations
Animal
Carnobacterium
Fish disease
Muscle
skeletal
Gadiformes
info:eu-repo/classification/ddc/639.8
Burbot
Lota lota
lota
Online Access:https://hdl.handle.net/11475/31302
https://doi.org/10.3354/dao03494
https://digitalcollection.zhaw.ch/handle/11475/31302
Description
Summary: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. We observed several health issues in burbot Lota lota reared for up to 2 yr in a RAS and used microbiological, histological and molecular-biological methods to identify the causative agents. Minor skin trauma led to the development of ulcers. In addition, several fillets of burbot showed pronounced granulomatous inflammation and calcification with signs of muscle fiber degeneration which resembled a condition called 'sandy flesh disease' in North American walleye. Several infectious agents were able to be excluded as a cause for the disease. 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 remains to be elucidated.

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