A study by NIWA shows almost half of our river network is inaccessible to migratory fish.

A further 36 percent could also be restricted but has not yet been assessed.

NIWA is now studying the swimming capabilities of native fish to try and come up with a solution.

Freshwater ecologist Dr. Paul Franklin joined Early Edition.

LISTEN ABOVE

A study by NIWA shows almost half of our river network is inaccessible to migratory fish.
A further 36 percent could also be restricted but has not yet been assessed.
NIWA is now studying the swimming capabilities of native fish to try and come up with a solution.
Freshwater ecologist Dr. Paul Franklin joined Early Edition.
LISTEN ABOVE

A fresh and intelligent start to your day - catch the very latest international and domestic news developments, sport, entertainment and business on Early Edition with Ryan Bridge, on Newstalk ZB.

A fresh and intelligent start to your day - catch the very latest international and domestic news developments, sport, entertainment and business on Early Edition with Ryan Bridge, on Newstalk ZB.