When water is too cold...

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pH7, Aquarium Ninja

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Jan 27, 2012, 10:44:36 PM1/27/12
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When water is too cold for them, how does it affect fish? What happens inside them?

Another related question is: what happens to fish when they experience temperature shock from a rapid or sudden drop in temperature? What happens then?

~pH7, Aquarium Ninja

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NetMax

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Jan 29, 2012, 4:34:30 PM1/29/12
to The Freshwater Aquarium
It sounds like you're looking for a technical answer. All I can say
is that as the water cools (gradually), it slows their metabolism.
They sink to the bottom (is colder water that more dense?), and their
activity level, appetite, colour and respiration are reduced.

Shock from a sudden drop in temperature will affect fish differently,
mostly depending on their mass. Little fish die and larger fish are
noticeably 'uncomfortable'. When I had a new employee fill a tank
with ice-cold water, the cichlids all parked at the bottom and faced
the front of the tank. If I read their expression correctly, they
were not amused.

ps: When water is a few degrees too cold, you should increase it
slowly to not shock them. If the water is very cold (ie: more than
8F), the advice is to increase the temperature quickly. I don't know
why but this is what I've successfully followed for many years.

NetMax

On Jan 27, 10:44 pm, "pH7, Aquarium Ninja" <p...@aquariumninja.com>
wrote:

pH7, Aquarium Ninja

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Jan 29, 2012, 5:34:29 PM1/29/12
to the-freshwa...@googlegroups.com

NetMax <comput...@hotmail.com> wrote:

>It sounds like you're looking for a technical answer.

I'm always looking for a technical answer! :-)

And I'm so glad you answered. I was afraid no one was going to answer and I can't get decent answers from anywhere else but books, which becomes a challenge when you don't know which ones to buy for any given question.

No other group or website that I've found has the understanding comparable to the answers I get here, so again, thank you.

Altum

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Jan 30, 2012, 4:56:02 PM1/30/12
to The Freshwater Aquarium
Cold fish slow down, eat less, don't grow as fast, and get sick if
it's too far out of their comfort zone. Basically their metabolism
slows, since their temperature is the same as the water. Temperate
fish sometimes have the instinct to hide when it's cold, like goldfish
in a winter pond.

Temperature shock tends to make fish more susceptible to illness.

--Altum

On Jan 27, 7:44 pm, "pH7, Aquarium Ninja" <p...@aquariumninja.com>
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