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Re: [Killietalk] re:moina, Japanese daphnia
Hello Mach,
Some years ago you gave me a starter culture of your Moina. For a while
they were doing fine, but then I neglected the culture somewhat and lost
them.
As I remember, they were NOT as small as Bro. Paul describes these
"Japanese Daphnia" -- "a smidge smaller" than brine shrimp nauplii. That
would make them about 400 micron, or even smaller.
There ARE Cladocerans in that size range even in the US -- Bosmina
longirostris (400u); Alonopsis fitzpatricki (400u) Streblocerus
serricaudatus (200-400u); Alonella nana (200-300u); Alonella dadayi
(<300u), etc., but I don't know anybody who cultures them.
Does anybody on the list have these critters or knows who does?
Best,
George
Mach Fukada wrote:
>
> Aloha Brother Paul,
> I have been raising them non stop for the past several years. Or at
> least since I moved to maui. They do make excellent food for many fish,
> especially fry. I have found that I can keep a good number of them in a
> tank with some fry and sort of forget them for a few days. The fry don't
> grow as fast as compared to those fed on artemia, However with my schedule
> I can't feed then every artemia three or four hours for maximum growth. I
> also have observed that it is probably a better feed for those cold water
> loving killies (Diapteron, etc).
>
> The cultures are sensitive to poor conditions. Most people have crashes
> because they run out of food or poor water quality. Both of these
> conditions will cause the Moina to produce resting eggs and prepare for long
> term survival. Most people have found out that they can and will reproduce
> really fast at high temps, but this make them very susceptible to crashes.
> I could never keep them going in Honolulu, but it was much warmer there. It
> is still in the 50-70 range here in Kula. Typically I could havest 1/4 cup
> of Moina every day, provided that I changed the water every day with new
> green water. I have it scheduled around every other day. More managable
> in term of time. I have three 20 gallon tubs for culture tanks of Moina.
> Also 2 tubs of Daphnia magna. The Moina does much better in the warmer
> months of the year and the Daphnia does better in the cooler months. about
> 70-90% of the water would be changed every other day. To accomplish this I
> have several large rubbemaid stocktanks (100-300 gallons) stocked with
> goldfish to produce greenwater. I will get some photos and put them up on
> the AKA members gallery....
>
> MTF
>
> Message: 2
> Date: Sat, 1 May 2004 20:15:41 -0400
> From: Paul_Jablinski at notes.udayton.edu
> Subject: [Killietalk] moina, Japanese daphnia
> To: killifish discussion list <killietalk at aka_org>
>
> Has anyone ever tried raising the daphnia, moina? They are very small in
> size, a smidge smaller than brine shrimp. They are excellent food for
> annual killie fry. I hear that the Asians use them for food for fry. It
> sounds also that they would be cheaper and more economical than buying
> brine shrimp. One can raise thousands in a one gallon container and do
> this the entire year without much trouble. They are easier to raise than
> raising magna daphnia. They are very nutritious - just think you can feed
> these daphnia all sorts of good foods (carrots, peas, yeast, whole wheat
> flour - all mixed with water and only a few drops a day will produce a lot
> of daphnia. And all the time and money you will save from hatching out
> brine shrimp. Or you could use brine shrimp as an extra nutritious food.
> Just think, these little critters will even multiply in the fry tank. You
> will never have to worry about overfeeding.
> I thought that I would bring this to your attention. You may want to try
> them as good food for you killies.
> Sincerely,
> Bro. Paul
>
> ------------------------------
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