Sole (Solea senegalensis). (Photo: IEO)
Probiotics enhance disease resistance in sole
Monday, July 18, 2011, 05:00 (GMT + 9)
A team of scientists from the Spanish Institute of Oceanography (IEO) demonstrated the benefits of including probiotics in the diet of Senegalese sole (Solea senegalensis).
Together with experts from the universities of Cantabria (UC) and Malaga (UMA) and from the Centre for Marine Research (CIMA) in Pontevedra, researchers at the Oceanographic Centre of Santander from IEO found that the probiotic Pdp11 (Shewanella putrefaciens) provides the sole with resistance to pasteurellosis disease, which is responsible for important economic losses in the Spanish aquaculture sector due to the closure of several companies.
The study, which has just been published in the journal Aquaculture Research, shows the influence of probiotic Pdp11 on the Senegalese sole growth, body composition and resistance to pseudotuberculosis.
Apart from being useful to improve the survival affected by this disease, the probiotic fosters greater animal welfare, protecting it against the stress caused by intensive farming.
During the research three groups of sole juveniles and three diets were used:
- A supplemented one with the fresh probiotic;
- Another one with the same freeze-dried probiotic;
- The latter with a standard diet control group.
According to scientists, in the case of the addition of fresh probiotic, a relative survival rate of 44 per cent was achieved.
Regarding the influence on growth, the group of sole fed with the fresh probiotic had higher rates than those observed in the control group. This effect was not recorded with the administration of freeze-dried probiotic, according to the IEO.
The researchers explain that intensive farming causes stress in the specimens, and thus, a lower digestive efficiency, increased susceptibility to potential pathogens and relevant economic losses for the industry.
Pasteurellosis or pseudotuberculosis is produced by Photobacterium damselae subsp. piscicida bacterium, a highly infectious organism that is responsible for numerous deaths in the Spanish aquaculture sector.
By Analia Murias
Photo Courtesy of FIS Member IEO - Instituto Español de Oceanografía (Oficina central)