Here's an interesting piece on the Freshwater Scud/Shrimp by Mick Hall - more proof that this is one fly pattern no trout angler should be without.
The truth is Scuds are everywhere. Just look for the most suitable water, be it ponds, small tarns or lakes and most, if not all, rivers. Scud are easy to make and you can adjust the colours to suit what you find in your favourite waters but don't forget the Hot Pink, as it just about works everywhere.
Read it here on Mick's blog: http://www.kossiedun.com.au/Scud.htm
Tie some up and fish them all year 'round.