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

Amen to that Dave. You other guys who have never gone collecting have no idea about the spectacular colors one sees when lifting the net. Of course outdoor sunlight helps a lot in the aquarium too. One good reason to build that fish room with a capture of the morning sun! You guys should see what a mature adult F. bifax looks in the wild. WOW! Joe
----- Original Message ----- From: "Koran, David HQ02" <David_Koran at hq02.usace.army.mil>
To: <killietalk at aka_org>
Sent: Thursday, July 07, 2005 8:45 AM
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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