Hill stream habitats in Hong Kong are home to some of the most endearing and enigmatic fishes on Earth. These oxygen-rich, cool mountain streams or often, torrential rivers, provide crucial habitat, not only for exclusively freshwater dwelling species, but also form important migratory routes and nurseries for anadromous, amphidromous and catadromous fishes, those which migrate upriver, those with complex breeding strategies involving both fresh and saline systems and those which migrate downriver to the sea to spawn, respectively. One Hong Kong hill stream species which is particularly fascinating is the goby Stiphodon atropurpureus. From their striking iridescence, their adaptation of …
