Didymo is likely to become prolific throughout the entire Hurunui River system if a dam is placed on the South Branch of the Hurunui- Didymo blooms go hand in hand with dammed and modified rivers !
(Photo shows didymo blooms in North Branch of Hurunui- stabilised naturally by lake Sumner. Didymo is now so prolific in the North branch of the Hurunui to make this section of river difficult to fish with nymphs or to spin fish).
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