try http://www.caudata.org/daphnia/
also http://aquamaniacs.net/forum/cms_view_a ... php?aid=33
I have a colony that i dont look after, and it waxes and wanes as it sees fit, but mostly i can get a small feed out of it all year.
I have scanned these links, and theyb seem to talk a lot on green water, but the best bloom I have ever had, was in a 15' pond I had, 2 days after refilling with tap water, and the water was absolutely red and had I been able to harvest it all, there would have been netsfull. The point is I guess dont fret or get to stressed out about looking after them...