Re: [Killietalk] RE: Role of vitamins in fish color

["Robert Goldstein" <rgoldstein at rjgacarolina_com>]

I don't know of any relationship between vitamin (or provitamin) D and fish 
colors. The pigments I know of are melanins, pterins, and carotenoids. 
Guanine crystals polare light reflected off the deep melanin layers to 
reflect blues and greens through the guanine crystals.

----- Original Message ----- 
From: "Al Anderson" <killiman at iquest_net>
To: "killifish discussion list" <killietalk at aka_org>
Sent: Thursday, July 07, 2005 9:53 AM
Subject: RE: [Killietalk] RE: Role of vitamins in fish color


> I think that is why Charlie Grimes puts his fish outside in his ponds 
> before
> photographing.
>
> -----Original Message-----
> From: killietalk-bounces at aka_org [mailto:killietalk-bounces at aka_org]On
> Behalf Of Koran, David HQ02
> Sent: Thursday, July 07, 2005 8:46 AM
> To: killietalk at aka_org
> Subject: [Killietalk] RE: Role of vitamins in fish color
>
>
> Here is a question to ponder for all of you biochemistry inclined killie
> nuts:  When you catch fish in the wild or in some cases raise them 
> outdoors
> you find very vivid colors that tend to fade over time as they are moved
> indoors to our rearing and breeding environs.  Production of vitamin D
> (calciferol) or more specifically vitamin D3 (that is capital D sub 3 
> which
> I
> cannot capture with this e-mail program) is cholecalciferol which is
> produced
> by the action of sunlight (radiant energy from UV light) on the precursor
> sterol 7-dehydrocholesterol which is present in the epidermis or skin of
> most
> higher animals (good suntan vs skin cancer??).  This is not present in 
> birds
> but fish oils are a good supplement for vitamin D for human diets.  Is 
> this
> also the factor for colors in killies.  A reference indicates salt water
> fish
> as having vitamin D (where present in the fish is not stated) and one 
> could
> figure the coloration of salt water fish backs this up although the
> liver-skin relationship is hard to translate.  Or is there another vitamin
> relationship to coloration (influenced by sunlight) that I am completely
> missing?
>
> Dave Koran
>
> Note:  This is in response to the thread on raising fish outdoors.  Also
> note
> that within about 24 hours of capture, killies tend to lose that "outdoor"
> color, hence sending them off to someone to photograph "ain't the same".
>
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