permaculture

[<permed@nor.com.au>]

>Log on to
>www.farmshow.com
>25 years of on farm ideas in a searchable database, also available as a cd 
>ROM.
>I have seen articles there on building windmill pond stirers out of truck 
>differentials.
>Mark

Frank - Do you have a specific reason for needing extra aeration.... 
would be an unecessary lot of work and expense unless you're considering 
going seriously into aquaculture/fish farming which is in reality a quite 
risky business. A healthy pond will support a nice stock of fish for home 
consumption with no extra input at the natural stocking rate of the water 
body - rule of thumb is 1 kg of fish for every 15m of linear edge (drives 
the food chain) and 15 square m of surface area (oxygen for fish to 
breath). Generally one doesn't need to aerate or provide extra fish food 
at these stocking rates and one needs to carefully consider if cost of 
the inputs will ever be recouped in higher fish yields. The higher the 
stocking rates, the higher the inputs (cost, materials, equipment, 
labour) and the higher the risk of system collapse.
Robyn