Oxygen level and fish varities

Hello,

Among marine (even fresh water )fishes which one are most sensitive to
low dissolved oxygen?
when oxygen level goes down in tank which species will first show
change in behaviour ( swiming on the surface, etc).
Which other organism ,zooplanktons etc will show response to change in
oxygen level?

ManyThanks,
Indulkar Shailendra
India

for freshwater fish:
cold water fish are most sensitive since there is more oxygen in cold water than warm
water.
fancy goldfish are next most sensitive
warm water tropical fish are more tolerant cause they evolved in low oxygen warm
water conditions hold the least oxygen.
for marine fish... no idea
Ingrid

wrote:

Hello,

Among marine (even fresh water )fishes which one are most sensitive to
low dissolved oxygen?
when oxygen level goes down in tank which species will first show
change in behaviour ( swiming on the surface, etc).
Which other organism ,zooplanktons etc will show response to change in
oxygen level?

ManyThanks,
Indulkar Shailendra
India



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.

Also, fish from fast-flowing rivers would tend to be acclimated to more
oxygen than fish from still waters. The fas****er plecos I read up on
(because this group fascinates me, for heated tanks) are often said to
need more highly oxygenated water than many other tropicals.

I dunno; I tend to feel that unless I'm bubbling pure O2 in there and
unless it's making a lot of turbulence for stillwater fish, there is no
such thing as TOO MUCH aeration. The Chaetostoma and gold marble
bristlenose (Ancistrus claro) seem to agree with me, except they say I
should turn that turbulence up...


-----------------------------------------
Only know that there is no spork.

Folks,

First of all, I really don't care about coldwater fish
for Goldfish and KOI are Warmwater fish.

The lowest concentration of oxygen that common Goldfish
fish can handle is 2mg/l. Fancy Goldfish usually start
showing distress long before commons, Comets,
Shubunkins and Wakins. This distress is usually
associated with the Swimbladder. Most Fancy Goldfish
have a truncated body and this tends to squeeze the
swimbladder in to a smaller space which is why,
genetically, Fancy Goldfish have a higher incidence of
Swimbladder problems.

For Fancy Goldfish 4mg/l is about as low as you would
want it to go and even then you may loose some fish.
With Fancy Goldfish it is imperative to keep the oxygen
level in your tank at the maximum which is about 6mg/l.
AirStones are very important for Fancy Goldfish for
this reason.

HTH

Tom L.L.
----------------------------------------------
wrote:
for freshwater fish:
cold water fish are most sensitive since there is more oxygen in cold water than warm
water.
fancy goldfish are next most sensitive
warm water tropical fish are more tolerant cause they evolved in low oxygen warm
water conditions hold the least oxygen.
for marine fish... no idea
Ingrid

wrote:


Hello,

Among marine (even fresh water )fishes which one are most sensitive to
low dissolved oxygen?
when oxygen level goes down in tank which species will first show
change in behaviour ( swiming on the surface, etc).
Which other organism ,zooplanktons etc will show response to change in
oxygen level?

ManyThanks,
Indulkar Shailendra
India




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.

"Tom L. La Bron" wrote in message ...
Folks,

First of all, I really don't care about coldwater fish
for Goldfish and KOI are Warmwater fish.

The lowest concentration of oxygen that common Goldfish
fish can handle is 2mg/l. Fancy Goldfish usually start
showing distress long before commons, Comets,
Shubunkins and Wakins. This distress is usually
associated with the Swimbladder. Most Fancy Goldfish
have a truncated body and this tends to squeeze the
swimbladder in to a smaller space which is why,
genetically, Fancy Goldfish have a higher incidence of
Swimbladder problems.

For Fancy Goldfish 4mg/l is about as low as you would
want it to go and even then you may loose some fish.
With Fancy Goldfish it is imperative to keep the oxygen
level in your tank at the maximum which is about 6mg/l.
AirStones are very important for Fancy Goldfish for
this reason.

HTH

Tom L.L.
----------------------------------------------

So L.La Bron, why r goldfish always categorized under coldwater fish
species then?? At around what temp do u sugggest should be kept for
fancy goldfish? is 23 degrees C all rite?
john




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.

In message , Tom L. La Bron
writes
Folks,

First of all, I really don't care about coldwater fish for Goldfish and
KOI are Warmwater fish.

Tom, while I appreciate that both species may well survive and be happy
at warmer temperatures, I think the big issue is that both species live
well and long in environments where the winter temperature drops to
levels that would kill fish usually classed as warm water fish very
quickly. In this country goldfish and koi both live long and happily in
outdoor ponds (I'm not sure what the record lifespan for a koi is but I
know it's huge), and the ambient temperature is sometimes below
freezing. If I remember my physics correctly, water is densest at 4
degrees C so there is a bottom band at this temperature whether the
surface is warmer or colder, but this can't be classed as "warm". For me
the key is survival, and the range of temperatures at which gf and koi
will survive is too great for them to be classed simply as warm- (or
cold!) water fish.

OT, at least as far as the original post is concerned, so apologies...

--
sophie

John,

Goldfish are incorrectly designated as coldwater fish
because they survive the winters and in many peoples
eyes this makes them coldwater fish, but they are
wrong. No knowledgeable piece of literature has ever
designated a goldfish as a coldwater fish. Coldwater
fish are fish that spend there lives in waters that are
40-60 degrees. In fact, 60 degree water is in the
upper level of their survival range. Goldfish can
survive in 38 degree F. water, but they are more in a
condition of suspended animation than really living.
Coldwater fish systems are fully functional at low
temperatures, so they eat, swimming vigorously and
reproduce at lower temperatures. Goldfish should have
their feedings stopped when temps get down to 55
degrees F (13 degrees C.) and below. Goldfish don't
successfully reproduce until the high 60's, any thing
below 68 degrees F. (20 degrees C.) can end up with a
lot of abnormalities and deformities. Eggs are best
hatched in the low 70 degree range. Personally I keep
my Goldfish cool in the winter having them inside the
house next to a window and on an outside wall to keep
the water temps in the low sixties with no heaters in
the tubs or tanks. During the rest of the year the
fish experience temperatures as high as 85 degrees F.
(about 30 degrees C.), when the summer outside temps
ride the 100 degree mark (37 degrees C)for as long as
a week at a time.

By-the-by, in temps in the low 70's coldwater fish
would be showing signs of distress and would eventually
die because of the temperature.

Your 23 degree C temp is fine for Goldfish.

HTH

Tom L.L.
-------------------------------------------
marcos wrote:
"Tom L. La Bron" wrote in message ...

Folks,

First of all, I really don't care about coldwater fish
for Goldfish and KOI are Warmwater fish.

The lowest concentration of oxygen that common Goldfish
fish can handle is 2mg/l. Fancy Goldfish usually start
showing distress long before commons, Comets,
Shubunkins and Wakins. This distress is usually
associated with the Swimbladder. Most Fancy Goldfish
have a truncated body and this tends to squeeze the
swimbladder in to a smaller space which is why,
genetically, Fancy Goldfish have a higher incidence of
Swimbladder problems.

For Fancy Goldfish 4mg/l is about as low as you would
want it to go and even then you may loose some fish.
With Fancy Goldfish it is imperative to keep the oxygen
level in your tank at the maximum which is about 6mg/l.
AirStones are very important for Fancy Goldfish for
this reason.

HTH

Tom L.L.
----------------------------------------------


So L.La Bron, why r goldfish always categorized under coldwater fish
species then?? At around what temp do u sugggest should be kept for
fancy goldfish? is 23 degrees C all rite?
john

Sophie,

Surviving in an extreme doesn't designate a fish as to
whether it is cold or warmwater. Living in that
environment is what designates whether the fish is cold
or warmwater.

Just because a Goldfish or KOI can survive in 38 degree
F. water doesn't mean that this is the fish's normal
environment for it normal living processes. Normal
living processes includes eating and reproduction of
which neither occurs at temperatures below 55 degrees,
where as, trout feed and reproduce in waters between
40-60 degrees, their normal living environment.

These are not my designations by the way. These are
the established designations by fish biologist and
aquaculturist.

HTH

Tom L.L.
-----------------------------------------
sophie wrote:

In message , Tom L. La Bron
writes

Folks,

First of all, I really don't care about coldwater fish for Goldfish
and KOI are Warmwater fish.


Tom, while I appreciate that both species may well survive and be happy
at warmer temperatures, I think the big issue is that both species live
well and long in environments where the winter temperature drops to
levels that would kill fish usually classed as warm water fish very
quickly. In this country goldfish and koi both live long and happily in
outdoor ponds (I'm not sure what the record lifespan for a koi is but I
know it's huge), and the ambient temperature is sometimes below
freezing. If I remember my physics correctly, water is densest at 4
degrees C so there is a bottom band at this temperature whether the
surface is warmer or colder, but this can't be classed as "warm". For me
the key is survival, and the range of temperatures at which gf and koi
will survive is too great for them to be classed simply as warm- (or
cold!) water fish.

OT, at least as far as the original post is concerned, so apologies...

Just as a note, I fully concur with Tom on his post.
Well written too.

In message , Tom L. La Bron
writes
Sophie,

Surviving in an extreme doesn't designate a fish as to whether it is
cold or warmwater. Living in that environment is what designates
whether the fish is cold or warmwater.

Just because a Goldfish or KOI can survive in 38 degree F. water
doesn't mean that this is the fish's normal environment for it normal
living processes. Normal living processes includes eating and
reproduction of which neither occurs at temperatures below 55 degrees,
where as, trout feed and reproduce in waters between 40-60 degrees,
their normal living environment.

These are not my designations by the way. These are the established
designations by fish biologist and aquaculturist.

HTH

it does, and I'm not questioning whether or not goldfish do *better* in
warmer water as it seems to me to be a given that they do; what I was
trying to say was that they aren't warm-water fish in the way that the
tropicals are - they don't need a heated tank and they won't die at the
(still relatively high) temperatures that would kill these fish; or at
the (still relatively low) temperatures that would make true cold-water
fish very uncomfortable indeed. I think my point might have been that
I'm uncomfortable with such a simplistic designation for such adaptable
fish. I'm a total newbie at this, so my opinion isn't worth a great
deal, but for gf I find either cold- or warm-water a confusing
designation.



Tom L.L.
-----------------------------------------
sophie wrote:

In message , Tom L. La Bron
writes

Folks,

First of all, I really don't care about coldwater fish for Goldfish
and KOI are Warmwater fish.
Tom, while I appreciate that both species may well survive and be
happy at warmer temperatures, I think the big issue is that both
species live well and long in environments where the winter
temperature drops to levels that would kill fish usually classed as
warm water fish very quickly. In this country goldfish and koi both
live long and happily in outdoor ponds (I'm not sure what the record
lifespan for a koi is but I know it's huge), and the ambient
temperature is sometimes below freezing. If I remember my physics
correctly, water is densest at 4 degrees C so there is a bottom band
at this temperature whether the surface is warmer or colder, but this
can't be classed as "warm". For me the key is survival, and the range
of temperatures at which gf and koi will survive is too great for
them to be classed simply as warm- (or cold!) water fish.
OT, at least as far as the original post is concerned, so
apologies...


--
sophie