A successive increase in aggregatio

A successive increase in aggregation associated with the relocation of the fish to areas with
better DO conditions was also observed. European catfish exhibit site fidelity, and they could
also be considered a territorial species, which is associated with their solitary behaviour (Carol
et al., 2007; Slavík and Horký, 2009). Nevertheless, some information regarding the aggregation
of adult European catfish in a very restricted area does exist. Boulêtreau et al. (2011