SUMMARYMyxozoans have been successfully used as tags for fish stock identification around the world. However, few studies using myxozoan tags have been carried out in the Southern Atlantic, a region with complex oceanography that constitutes a potentially suitable scenario for testing the utility of myxozoans as indicators. Its usefulness was tested using six samples ofMerluccius hubbsiin two different regions of the Argentine Sea. Generalized linear models were performed to assess the effects

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... f fish size and sex, and year and region of capture and selected using the Information Theoretic approach. Three myxozoan species were recorded:Kudoa rosenbuschi, Myxoproteus meridionalisandFabesporasp. Results of modelling species individually showed differential capabilities for detecting geographical population structure at different spatial scales, withK. rosenbuschiandFabesporasp. allowing the discrimination of northern and southern stocks, butFabesporasp. also as a promissory indicator of intrapopulation sub-structure due to different migratory routes during non-reproductive periods. This work confirms that myxozoans offer a set of suitable markers at different spatial scales, which can be selected individually or in any combination, depending on the geographical extent of the study, constituting tools adaptable to the objectives of further research on fish population structure.