Fellow Canberrans and the likes, I've been doing some reading up on the latest developments into the plans to expand the Cotter dam 20 fold and its effects on the Native species that inhabit the waterway: such as Macquarie Perch, Two Spined Blackfish, Trout Cod and Murray River Crayfish. Although im 100% with the conservation of the native fish species it would be interesting to know what effects the expansion would have on the fish populations and even the recreational value of the area itself. The UC have been conducting some very interesting surveys looking into mainly the Macquarie Perch populations and have been having some good succes into learning a little more about these elusive little critters. They have also been experimenting with some man made environments such as: The addition of man made rock reefs and other structures to create suitable cover and feeding environments for the species. The reason this has been undertaken is that the expansion of the lake could potentially drown out the surrounding reed and weedbeds that provide the perch cover from the potentially hazardous cormorants and other low flying dangers. There are also talks of installing some underwater cameras to monitor fish habits and also the potential threat from the large population of Brown and Rainbow trout. This is great news and should help us further understand the strange ways of the once abundant Macca! I also read in a report that the expansion of the dam if the implementation of sufficient man made structures is a success could be a positive in the growth of an already relatively healthy population of perch. Also great news when it comes to the last known Migrating and self sustaining population of macquarie perch inside the ACT (Cotter River). Since the installation of the Vanity's crossing fishway there has been a consistant number of migrating perch breeding above the weir itself which is great news. I believe that 25 Perch within the Dam have been tagged with radio tracking devices to examine the movement between certain areas of the dam and i look forward to reading some more info on that matter. Another intersting fact about the cotter expansion is that if all goes to plan the storage capacity will be increased by 20 times its maximum capacity at the moment, making it the largest storage facility out of the existing cotter river storages. This is all public information but i thought i might get a little topic started regarding the proposal. I'm 100% behind the research towards the protection of the native fish and if the studies come to a conclusion that the new works will have minimal effects on the populations, it would be interesting to watch the project grow and eventually be completed. What are your thoughts on the expansion of the dam? I am aware that some of the surrounding farm land and national park will be flooded, Causing more havoc to land dwelling animals and farm owners. This is also another area worth considering. Very interesting stuff when it comes to our water supply. Do we, or don't we? With so many things to consider, i really feel for the governing agency that has to make the decision in the end. Cheers, Rory.