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In this study, we investigated the host choice of naïve   Amphiprion ocellaris  , a specialist, at two different stages of development (newly settling juveniles and post‐settlement juveniles). The fish were exposed to their natural and unnatural host species in the laboratory and their fitness was assessed in terms of activity and growth rate. Newly settling juveniles exhibited little host preference, while post‐settlement juveniles immediately associated with their most common host in the wild. The analysis of fish activity confirmed that   A. ocellaris   is diurnal; they are most active in the morning, less at midday and barely move at night. The average travelling distance of juveniles was shorter in the groups living with their natural host, increasing in the groups living with an unnatural host and was highest in groups that did not become associated with any other unnatural host species. Post‐settlement juveniles living with the natural host species grew better than those living with unnatural hosts or without anemone contact. These results suggest that the welfare of   A. ocellaris   in captivity will be optimized by keeping them with their natural anemone host species, although more generalist  Amphiprion  species may survive in association with other hosts.

journal of fish biology

Host choice and fitness of anemonefish    Amphiprion ocellaris    (Perciformes: Pomacentridae) living with host anemones (Anthozoa: Actiniaria) in captive conditions