[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: overwintering daphnia
At 09:07 PM 3/1/2002 -0500, you wrote:
>I wonder if anyone out there has kept a Daphnia culture outside in a northern
>winter and then had it come back to life in the summer months.
Absolutely. I had a culture of Daphnia in upstate NY outside in a 300 gal stock tank. I rarely fed it anything, except very occasionally some yeast. I could harvest enough for those fish that needed them. They over-wintered for about 4 years before I moved here to Oregon. That stock tank regularly froze solid. It had lots of dead leaves and other detritus on the bottom, which I think harbored the organisms that the Daphnia fed on.
I have over-wintered both Daphnia magna and Moina here in Oregon where it gets so cold that there is sometimes ice on the top of the water in the stock tanks :o) Seriously, our temperatures here this winter have fairly often got down into the 20s at night, but our daytime temperatures are usually in the 40s. Spring has sprung here, by the way. Our crocuses have been blooming since the first week in February, the trees are budding, and the daffodils are about to bloom.
Barry J. Cooper, Prof., Dept. Biomedical Sciences, Cornell University
Current address: 27505 Riggs Hill Rd.
Sweet Home, OR 97386 (bjc3 at cornell_edu)
See http://www.aka.org/AKA/subkillietalk.html to unsubscribe
Join the AKA at http://www.aka.org/AKA/Applic.htm