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Background  Ephippidae fish are characterized by a discoid shape with a very small visceral cavity. Among them  Platax orbicularis  has a high economic potential due to its flesh quality and flesh to carcass ratio. Nonetheless, the development of its aquaculture is limited by high mortality rates, especially due to  Tenacibaculum maritimum  infection, occurring one to three weeks after the transfer of fishes from bio-secure land-based aquaculture system to the lagoon cages for growth. Among the lines of defense against this microbial infection, the gastrointestinal tract (GIT) is less studied. The knowledge about the morphofunctional anatomy of this organ in  P. orbicularis  is still scarce. Therefore, the aims of this study are to characterize the GIT in non-infected  P. orbicularis  juveniles to then investigate the impact of  T. maritimum  on this multifunctional organ.    Methods  In the first place, the morpho-anatomy of the GIT in non-infected individuals was characterized using various histological techniques. Then, infected individuals, experimentally challenged by  T. maritimum  were analysed and compared to the previously established GIT reference.    Results  The overlapped shape of the GIT of  P. orbicularis  is probably due to its constrained compaction in a narrow visceral cavity. Firstly, the GIT was divided into 10 sections, from the esophagus to the rectum. For each section, the structure of the walls was characterized, with a focus on mucus secretions and the presence of the Na + /K +  ATPase pump. An identification key allowing the characterization of the GIT sections using  in toto  histology is given. Secondly, individuals challenged with  T. maritimum  exhibited differences in mucus type and proportion and, modifications in the mucosal and muscle layers. These changes could induce an imbalance in the trade-off between the GIT functions which may be in favour of protection and immunity to the disadvantage of nutrition capacities.

Description of the unusual digestive tract ofPlatax orbicularisand the potential impact ofTenacibaculum maritimuminfection