An interim report by a team commissioned by the Morrison government has found the health of the lower Darling River remains in a poor state and more fish deaths are likely to occur.

A study into the recent mass fish kills recommends Murray-Darling basin governments should "re-evaluate" a costly plan to alter the Menindee Lakes, introduce real-time monitoring to cut water theft and update modelling to account for climate change.

The interim report also found low inflows and dry conditions across the catchment are likely to continue "for the foreseeable future".

Graeme McCrabb on his tinnie in the Darling River, floating among dead Murray cod and other fish just after the second of three big fish kill events near Menindee. Credit:Nick Moir

The team - led by Rob Vertessy, a Melbourne University professor and former Bureau of Meteorology head - came to similar conclusions as to the cause of the fish kills as an Academy of Science study commissioned by the federal ALP and released on Monday.