"Once this study was completed the Hamurana koaro restoration working party was set up to develop the restoration plan," Mr Hancock said.
"The restoration plan identified Hamurana Springs as an ideal site to install a trout barrier. After the barrier was installed in May 2012, trout were captured and relocated downstream. The trout barrier prevented trout entering part of the stream which provided an area for koaro to breed."
The structure is the first of its kind in the Bay of Plenty and if successful may be used in other locations.
Initial monitoring in July 2012 and February 2013 still showed overall numbers were low. Monitoring in July 2013 showed the numbers of koaro had significantly increased, providing hope the koaro population would continue to breed and grow in size.
"The latest survey results, although positive, should not be viewed as conclusive. However, what can be noted is that the current survey indicates not only has there been an increase in the number of koaro surveyed but also a number of new juveniles have been added to the local population," he said.
The monitoring is done by volunteers annually. All volunteers attended a two-day training session, which included practical monitoring, fish identification and water safety skills.
"This programme could not have achieved these results without the assistance of the many volunteers who gave given up their time to be part of this project. They have all contributed to the success of the koaro programme and the working party wishes to extend a note of thanks and appreciation to everyone who has been involved," Mr Hancock said.