Re: [Killietalk] Dissing Daphnia ?

["Robert Goldstein" <rgoldstein at rjgaCarolina_com>]

Bruce Turner reminded me that the red color in daphniae is hemoglobin, not 
carotenoids. I'd forgotten that (and most other things).

---- Original Message ----- 
From: "Robert Goldstein" <rgoldstein at rjgacarolina_com>
To: "killifish discussion list" <killietalk at aka_org>
Sent: Monday, December 03, 2007 1:40 PM
Subject: Re: [Killietalk] Dissing Daphnia ?


>I would surmise that daphniae and other crustaceans (limiting the 
>discussion
> to crustaceans) would be pretty consistent in percent protein but vary a 
> lot
> in fat content depending on the oils in their diet. Crustaceans use 
> protein
> and other substances structurally but are able to store huge amounts of
> oils. The types of oils especially HUFAs from certain algae (mostly
> dinoflagellates) influence the nutritive value of them as live food for
> fishes. In general, however, I think an especially valuable function of
> live daphniae is their removal from the water of bacteria and other single
> celled critters that use up oxygen, release waste products, and perhaps
> compete for other small foods. Daphniae beat the heck out of any filter I
> know, and trays, jars, and other containers of fry seem to do much better
> when live daphniae are added. BTW, I keep my daphniae going (indoors) in 
> 30
> gal plastic barrels and the only food they get consists of the protzoa and
> other stuff that lives off the dead hardwood leaves on the bottom. They 
> are
> also nice and red, which I assume is from carotenoid oils.
>
> ----- Original Message ----- 
> From: "ROBERT ELLERMANN" <ruevenm at sbcglobal_net>
> To: "killifish discussion list" <killietalk at aka_org>
> Sent: Saturday, December 01, 2007 2:04 PM
> Subject: Re: [Killietalk] Dissing Daphnia ?
>
>
>> could it have been vitamins in the daphnia or other necessary "food
>> stuffs'  besides protein and fat?
>>
>>  Bobby
>>
>> "Bruce J. Turner, Dept. Biol. Sci., VPISU, Blacksburg, VA 240"
>> <fishgen at vt_edu> wrote:
>>  I believe that a retailer named Earl Schneider in New York wrote a 
>> couple
>> of
>> books on fish care in which he did have some analyses of Daphnia made.
>> (Schneider was the original publisher of the Pet Library series, before
>> TFH
>> bought it.) I think it was from one of those books that I got the idea
>> that
>> Daphnia were mostly shell and water. If I recall correctly, Schneider was
>> prompted to do these analyses because virtually everyone in the NY/NJ 
>> area
>> at
>> the time swore by the critter. "Portions" of live Daphnia were sold in
>> most
>> pet shops, and several people made something of a living collecting and
>> distributing it to these shops. Their collecting localities were deep,
>> dark
>> secrets, but everyone knew they were getting the stuff from ponds in
>> Canarsie
>> and Pelham. Many of us went on Daphnia hunts on early weekend mornings,
>> long-handled nets and all...
>>
>> Some years ago, Daphnia and some related creatures enjoyed serious
>> popularity as
>> test organisms in aquatic toxicology. There were several labs here that
>> were
>> breeding Daphnia by the bucketful to serve their needs, and I was able to
>> harvest their surplus. Some days, buckets and buckets of Daphnia---more
>> than I
>> could use. I was breeding large numbers of blue gularis, gold lyretails
>> and
>> gardneri Akure then, selling them locally to help finance my research, 
>> and
>> I
>> was very impressed with the yields of eggs that I got when feeding
>> Daphnia. I
>> have never been able to explain this, and I would agree that it needs 
>> some
>> looking into.
>>
>> Bruce J. Turner
>> Dept. Biol. Sci.
>> VIRGINIA TECH
>> Blacksburg, VA 24061
>> (540)-231-7444 (V)
>> "...We are Hokies. We will prevail..."
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>
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