Re: [RML] Rainbow fry and 24 hour light?

Effie Howe (Effie.Howe at foodscience.afisc.csiro.au)
Wed, 28 Oct 1998 12:30:05 +1100 (EST)

Human babies in intensive care wards are kept with lights on 24 hours. From
personal experience when they get home they don't settle easily. I'm pretty
sure that I've read somewhere that it does have some impact on them (it must
be upsetting their biological clock). I'm not sure how this relates to fish
fry. If I haven't been able to feed my fish fry as often as I want during
the day I leave the lights on so that I can feed them at night.

Effie

At 11:39 AM 10/28/98 +1100, you wrote:
>
>
>On Mon, 26 Oct 1998, Mach T. Fukada wrote:
>
>> Maybe not need, but they will feed all the time that they can see. This
>> way they grow faster, and maybe grow better.
>
>Mach, I am not so sure that "faster" equates to "better". It is one thing
>to feed them as many rotifers/whatever as they will eat by drip-feeding
>them through the day (the exponents of this system claim miraculous
>results and I have no reason whatsoever to doubt them) as this replicates
>what the fry would have in nature - continuous access to unlimited amounts
>of food. But I am yet to be convinced that 24 hour light is not screwing
>with developing systems within the fry that may be affected by light
>levels/durations - I have vague recollections about something to do with
>hormone production linked to lighting - can someone else remember this?
>Something brought up years ago to do with the pituitary gland in higher
>animals?
>
>Cheers, Andrew
>
>
>______________________________________________________
>andrew at pcug.org.au http://www.tip.net.au/~andrew
>
>As Ralph Waldo Emerson once said:
> "I hate quotations. Tell me what you know."
>______________________________________________________
>
>
>
>