Ini­tial success

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rea­son­ably large rivers, lakes, and a beach.

Many an­glers tell me sci­ence has been slow with re­gard to so­lu­tions for didymo in­fes­ta­tions and al­gal blooms – the bane of an­glers at so many rivers when flows are re­duced over sum­mer while other rivers run dry dur­ing drought pe­ri­ods.

To be fair, sci­ence has been ac­cu­mu­lat­ing facts and ap­prais­ing test regimes for some years, and given time and fund­ing may find so­lu­tions to al­gal blooms.

But in terms of water is­sues in Can­ter­bury the time may be run­ning out.

Otago, Can­ter­bury, and Marl­bor­ough re­gional coun­cils have each is­sued health warn­ings this sea­son, and so, too, Welling­ton and Taranaki. Al­gal blooms are in­deed a wide­spread prob­lem.

Sci­en­tists from the Univer­sity of Waikato and vol­un­teers re­cently scoured Lake Ro­tokare for two days and be­lieve perch may be re­spon­si­ble for the toxic blue-green al­gae known as cyanobac­te­ria.

They say th­ese fish eat mi­cro­scopic an­i­mals (zoo­plank­ton), which af­fect the food­chain and water qual­ity and if se­ri­ously re­duced the

Let­ting it go: The 32-cumec spill through the Opuha Dam con­trol gate dur­ing the test pe­riod.

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