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  • Pool habitat is estimated to occupy around 40-50% of the 2.3 km gorge section subject
    to proposed flow reductions. The key consideration for maintenance of pool habitat is
    adequate flushing flows to prevent de-oxygenation and other such processes that could
    result in ecosystem collapse.
  •  Run/riffle habitat inhabitable by fish is estimated to occupy 5-20% of the 2.3 km gorge
    section. A ‘worst case’ estimate of the scale of loss of run/riffle habitat for koaro and
    juvenile longfin eel within the gorge, equates to loss of habitat for around 200 koaro,
    and 200 juvenile longfin eels, should flows be lowered well below the Q5. This
    estimate gives an indication of the scale of potential fish habitat loss only.
  •  Overall, habitat throughout all the potentially affected reach is likely to only sustain
    low blue duck productivity due to low invertebrate production and poor instream
    stability.
  •  Loss of 200 – 500 metres of intermediate gradient potential blue duck feeding area
    may occur, depending upon where the powerhouse discharge is located. Combined
    with the 2.3 km gorge section, this is estimated to represent habitat capable of
    supporting 25-50% of the territory for one breeding blue duck pair that could be
    affected by the scheme.

References

Deans, N., 2003: A Fisheries Survey of the Parapara River. Fish & Game New Zealand,
Nelson/Marlborough Region July 2003.

Jack, D., Barrier, R., 2000: Shortjawed kokopu (Galaxias postvectis). Conservation status in
Nelson/Marlborough – Year Two Interim Report. Occasional Publication No. 47.
Jack, D.C., Barrier, R.F., Goodman, J., 2001: Short-jawed kokopu (Galaxias postvectis).
Conservation Status in Nelson/Marlborough – Year Three Interim Report. Occasional
Publication No. 51.

Studholme, B., Barrier, R., Jack, D. 1999: Shortjawed kokopu (Galaxias postvectis).
Conservation Status in Nelson/Marlborough – Year One Interim Report. Internal publication
no. 31.

Studholme, B., 2000: Blue Duck (Whio). Survey of the distribution and abundance of blue
duck (whio) in Kahurangi National Park. Department of Conservation, Occasional
Publication No. 46.
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