As most fish, Lethrinus rubrioperculatus is the host of many species of parasites.

Monogeneans parasitic on the gills include the diplectanid Calydiscoides euzeti, the ancyrocephalids Lethrinitrema gibbus and Lethrinitrema dossenus and several capsalids.

Copepods parasitic on the gills include the caligid Caligus lethrinicola and the lernanthropid Sagum vespertilio.

The gills also harbour unidentified gnathiid isopod larvae.

The digestive tract harbours an unidentified Acanthocephala, unidentified tetraphyllid cestodes, species of the anisakid nematode Raphidascaris (Ichthyascaris), and a variety of digeneans, including the acanthocolpid Stephanostomum aaravi, the hemiurid Lecithochirium sp.
and Tubulovesicula angusticauda, the opecoelid Pseudoplagioporus interruptus and three other opecoelids.

The abdominal cavity contains two species of larval tetrarhynch cestodes, the otobothriid Otobothrium parvum and the tentaculariid Nybelinia goreensis.

In New Caledonia, where its parasites were particularly studied, Lethrinus rubrioperculatus has a total of twenty species of parasites.
As most fish, Lethrinus rubrioperculatus is the host of many species of parasites. 
Monogeneans parasitic on the gills include the diplectanid Calydiscoides euzeti, the ancyrocephalids Lethrinitrema gibbus and Lethrinitrema dossenus and several capsalids. 
Copepods parasitic on the gills include the caligid Caligus lethrinicola and the lernanthropid Sagum vespertilio. 
The gills also harbour unidentified gnathiid isopod larvae. 
The digestive tract harbours an unidentified Acanthocephala, unidentified tetraphyllid cestodes, species of the anisakid nematode Raphidascaris (Ichthyascaris), and a variety of digeneans, including the acanthocolpid Stephanostomum aaravi, the hemiurid Lecithochirium sp. and Tubulovesicula angusticauda, the opecoelid Pseudoplagioporus interruptus and three other opecoelids. 
The abdominal cavity contains two species of larval tetrarhynch cestodes, the otobothriid Otobothrium parvum and the tentaculariid Nybelinia goreensis. 
In New Caledonia, where its parasites were particularly studied, Lethrinus rubrioperculatus has a total of twenty species of parasites.
Lethrinus rubrioperculatus