CPS Enviro technical report to The Commonwealth Environmental Water Office
About the document
In 2017–18, ~25 gigalitres of water for the environment was delivered to support Murray cod spawning and the survival of Murray cod and golden perch juveniles (referred to as ‘recruitment’). It aimed to build on the outcomes and experiences from flows delivered down the Darling the previous year.
This study documents and assess the outcomes achieved from these flows. The key findings from this study were:
- Cumulatively, Murray cod spawned in spring 2016 and 2017, in conjunction with environmental flows, comprised nearly one-third of the overall population structure.
- Murray cod spawned in spring 2016 accounted for 14 per cent of the population structure indicating 2017–18 environmental flow had continued to support recruitment of 2016 spawned fish into the population.
- Murray cod spawned in 2017 also contributed 14 per cent of the overall population structure.
- Monitoring of the lower Darling River golden perch population in winter 2017 demonstrated that new recruits comprised over 30 per cent of the golden perch population structure.
This is a remarkably high contribution of new recruits and demonstrates the value of embedding a conceptual understanding of the life history ecology of golden perch into the environmental flow delivery schedule for the lower Darling River.