than once over the spawning season, and one male may defend the eggs of more than one female. Upon hatching, the 3 mm fry are carried downstream to the sea; several months later, they return as 15–20 mm juveniles, and live the rest of their lives in fresh water. Redfin bullies seem obliged to spend their first few months at sea, because no landlocked populations have been found. Juveniles have the best climbing ability of the Gobiomorphus species, but are mostly found in lowland waterways. They reach sexual maturity in their second year and have an average lifespan around 3–4 years. Diet and foraging G. huttoni is an opportunistic feeder, eating the larvae of chironomid midges, mayflies, and caddisflies, small crustaceans, and aquatic snails. Threats The main threats to G. huttoni are competition and predation from introduced salmonid fishes, mainly brown trout (Salmo trutta), and habitat loss. Over the period of 2004 - 2014, redfin bully numbers declined by 20%, and they are now classified as a near-threatened species. References External links Photograph of male Photograph of female Eleotridae Taxa named by James Douglas Ogilby Endemic freshwater fish of New Zealand Fish described in 1894