Home / New ZealandEnvironmental groups concerned about Christchurch rivers (+video)20 Feb, 2008 09:40 PMQuick ReadSubscribe to listenAccess to Herald Premium articles require a Premium subscription. Subscribe now to listen.Subscribe nowAlready a subscriber? Sign in hereListening to articles is free for open-access content—explore other articles or learn more about text-to-speech.SaveShareShare this articleCopy LinkEmailFacebookTwitter/XLinkedInReddit KEY POINTS: Concerns over algae growth in Christchurch rivers have environmentalists worried. AdvertisementAdvertise with NZME.AdvertisementAdvertise with NZME.SaveShareShare this articleCopy LinkEmailFacebookTwitter/XLinkedInRedditLatest from New ZealandNew ZealandStudy finds four-day week reduces burnout, boosts job satisfactionWellington'Significant delays': Kāpiti trains cancelled after vehicle hits bridge on SH1New Zealand'Set up' for robbery: New details emerge in fatal assault caseSponsoredSolar bat monitors uncover secrets of Auckland’s night skyAdvertisementAdvertise with NZME.