The giant kokopu (Galaxias argenteus) is an endemic diadromous fish species that is considered threatened, which has been partially attributed to habitat loss. During this study we aimed to evaluate whether giant kokopu in urban streams in Hamilton, New Zealand, was habitat or recruitment limited by habitat restoration and fish release. Habitat was enhanced in ten urban streams by introducing 20 clay pipes or 10 ponga fern (Dicksonia squarrosa) logs into two 20-m sections of each stream, and leaving a third upstream section unmodified to serve as a control. Thirty marked, farm-reared juveniles were released into each of five streams in April 2007. Survival of the released fish, as well as any wild fish, is being monitored to establish the success of the fish releases under the different habitat treatments. Preliminary results indicate a survival rate of released fish of at least 16% over 19 weeks, with an average growth rate of 27 mm or 44% in some of the stream sections.