The site fidelity of ballan wrasse Labrus bergylta was studied using photo-identification and external tagging. Five male individuals were observed to defend the same small territory composed of a few rocks during several reproductive seasons spanning 2 to 15 years. These results provide one of the strongest indications of long-term very fine-scale site fidelity in marine fishes.
Keywords: Galicia; Labrus bergylta; ballan wrasse; photo-identification; site fidelity; territoriality.
© 2019 The Fisheries Society of the British Isles.