FAQs on the Neon
Tetras: Reproduction, Breeding
Related Articles: Cardinal
Tetras; A School of Beauty, Part
II, by Alesia Benedict, Neons, Cardinals & Their Kin;
Selection, Maintenance & Healthcare by Neale Monks
Characid Fishes,
FAQs on: Neon Tetras 1, Neon
Tetras 2,
FAQs on: Neon Tetras
Identification, Neon Tetras
Behavior, Neon Tetras
Compatibility, Neon Tetras
Stocking/Selection, Neon Tetras
Systems, Neon Tetras Feeding,
Neon Tetras Disease,
Related FAQs: Cardinal Tetras, Characid/Tetra
Fishes,
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Breeding Neons in distilled water 6/13/10
Hello:
<Hello,>
I have a 20 gallon long tank with a couple of guppies and 11 Neons.
<Not the best combination! Neons and Guppies have very different
water chemistry requirements, and Neons also need to be kept somewhat
cool, 22-24 C, whereas Guppies -- at least the farmed fancy varieties
-- do better at
25-30 C.>
I was thinking of trying to breed the Neons.
<Very challenging. Have you tried breeding egg scatterers before? If
not, you'd be better off with, say, Zebra Danios or Bronze
Corydoras, both of which spawn readily and produce relatively large
eggs from which sizeable
fry emerge. Neons are far more picky about water chemistry, and their
fry are rather small. Whereas you can rear Danio and Corydoras fry on
liquid fry foods, even finely powdered flake, Neons will need suitable
live foods,
specifically infusoria to begin with (they hatch about 3-4 days after
spawning), and then Microworms and brine shrimp nauplii perhaps a week
later.>
My husband suggested distilled water.
<Not by itself, no. You're aiming for 1-2 degrees dH, pH
5.5-6.0, at a steady 24 C. If you have hard tap water, that's going
to be something like 1 part tap water to 9 parts distilled, RO or
rainwater. But use your pH and hardness test kits to be sure. The tank
needs to be filtered with an air-powered box filter containing Zeolite
since biological filtration won't work reliably at such a low pH.
Since the carbonate hardness will be close to zero, you will need to
perform regular water changes to avoid pH drops through acidification
-- likely 5-10% daily.>
I have a one gallon jar
<Too small.>
and I was going to put no more than six Neons in there for a day or two
in the distilled water and leaving it out of the light. I was wondering
if that is the right way to try to breed Neons??
<No. You need to first condition the Neons elsewhere, e.g., with
lots of live foods. Once you have obviously "ripe" females
and males flirting with them, introduce pairs into a well shaded 5-10
gallon aquarium with a killifish-style spawning mob placed on the
bottom of the tank. Feathery plants like Myriophyllum and Cabomba work,
too. Spawning is often triggered by early morning sunlight, a trait
common among egg-laying fish. Eggs are scattered about, not in great
numbers, usually less than 50 at a time.
After spawning, remove the parents promptly because they will eat the
eggs.
Repeat as required. If you don't already own a book in fish
breeding, do track one down. 'Fish Breeding' by Chris Andrews
is excellent, and can be picked up second hand for pennies.>
Thank you
<Cheers, Neale.>
Re: Ceramic media, air pumps... Actually Neon Tetra... dis.,
repro. -- 09/13/07 Hello Neale, <Hello Giuseppe,>
as you know I have 2 adult Neons in my tank. One of them has a larger
abdomen compared to the other one, so I assume I have a male and a
female. <Indeed. According to Baensch, the difference is also seen
in the shape of the blue line: on males it is straight, on females it
is bent. But I can't see any difference!> Now, I noticed that
every 6-8 weeks the female becomes even larger and tends to eat much
less and spend most of the day in a quiet spot of the tank. This
situation lasts for about 10-15 days, after which her abdomen goes back
to normal and she starts eating normally. <Odd.> Do you think
that she might have eggs during the time she's more swollen and
doesn't eat much? <Sounds plausible enough. Do keep an eye out
for Neon Tetra Disease though: key symptoms are shyness, loss of
appetite, and loss of colour. Then they die! NTD is unfortunately very
common.> If this is the case I would be very fascinated in trying to
breed the two Neons. I read that it's pretty challenging, but that
experience would be extremely exciting for me, considering also that
neon tetra is one of my favorite fish. <I'm not sure it's
"difficult" per se, since these fish are bred in their
millions on fish farms. The problem for most aquarists is Neons only
breed in very soft water. The other big mistake people make with Neons
is to keep them too warm; while they aren't subtropical fish, 26C
(79F) is the top of their preferred thermal range, and for breeding
they only want around 24C (75F). When kept in hard, overly warm water
they just won't spawn, or if they do, the eggs become fungused.>
Do you also have any good web site where the breeding process for Neons
is described in detail? <Is there nothing here at WWM? Breeding
Neons follows the same basic pattern as most other tetras. Soft (<2
dH), acidic water (5-6); low light levels (i.e., no lights, lots of
shade); little to no water movement; and benthic plants like Java moss
to catch the eggs. Sunlight can be a good spawning trigger. Eggs hatch
in one day, free swimming 3-4 days later, when they take Artemia
nauplii and the like. If you're interested in fish breeding,
there's an excellent book by Chris Andrews called 'Fish
Breeding'. It's my bible for fish breeding. You can usually
pick up used copies on Amazon and the life for a dollar or two.>
Thank you, Giuseppe <Good luck, Neale>
Re: Ceramic media, air pumps... Actually Neon Tetra... dis.,
repro. -- 09/13/07 Neale, <Giuseppe,> I just
bought that book. I was thinking about what you said about the water
conditions needed to breed neon tetras and I have a couple of
questions: 1 - Currently the tank where they live has a temperature of
78F and PH at 7.0. If I setup a second tank with lower temperature and
acidic water, wouldn't the Neons have a shock when I move them from
one tank to the other one? <Small water temperature changes
don't harm freshwater fish; indeed, they are often important
spawning triggers. If you're moving the fish from one tank to
another, then doing the normal thing of placing the fish in a bucket of
"old" water and dribbling in the "new" water over
30 minutes will not only adapt them to the new water chemistry but the
water temperature too. If you're taking the fish across a dramatic
water chemistry change, e.g., from hard water to very soft water, you
would probably be wise to fill the breeding tank with hard water and
then do soft water changes of around 20% each day until the water
chemistry had changed over completely. Do also remember that very
acidic water doesn't support biological filtration. You will need a
small air-powered box filter filled with ammonia-remover for such a
tank. There's a good argument for not filtering the tank while the
parents are actually spawning and when the eggs are sitting in the
moss. Only start the filter back up once the fry are free swimming.>
2 - If the Neons have to be kept in dark conditions but with plants in
the tank, wouldn't the plants die for lack of light? <Yes, if
you kept the lights off all the time. What you're aiming for is to
put the Neons in the tank for a week, and once settled down, turn off
the lights so the tank only gets natural light, and once they've
laid their eggs and the fry are free swimming, turn the (subdued)
lights back on. Regardless, the level of lighting should be low, and
the peat extract in the water will make it quite murky. Java Moss will
tolerate this regime fine. I have one tank that simply receives natural
light from a window and the Java Moss has gone wild. Baby fish love the
stuff, because it collects detritus and micro-organisms that they can
eat. There's obviously a balance between having a nice rich
microflora and a dirty tank though! Some people skip plants and use
synthetic mops of various types, home-made (boiled dark-coloured yarn,
teased into threads and then knotted) or purchased. There are really
many options.> 3 - How long does it typically take from when the
Neons are moved to the breeding tank to when they actually spawn?
<No idea, never done it myself. Typically fish take a few days to
settle into a spawning tank, but once there, if they're mature
enough to breed, they will do so almost at once. The key thing is
conditioning the female: lots of live foods so that she gets nice and
fat.> Thank you, Giuseppe <Cheers, Neale>
Sexing Neon Tetras 8/16/06 Hola to
all, I want a female neon tetra but how do I know it is a
girl? Thanks, Anonymous <Not easily
done... there are folks who claim there is a color difference twixt the
sexes of Paracheirodon innesi... but about the only way I've been
able to tell is when they're large-enough and the females
egg-laden... Bob Fenner>
Pregnant Tetras 8/6/06 My name is Dom, I am
13 and I wondered if you could tell me how do you know if your neon
tetras are pregnant? Yours sincerely Dom < Many female tetras are
slightly larger and fuller then the males. Females will generally be
much fuller in the belly region when they are getting ready to spawn.
Many aquarists think that their fish are pregnant but they end up dying
because of an internal infection. Sick fish usually do not eat and are
very reclusive. A breeding female tetra is very active trying to
attract a male so she can spawn.-Chuck>
Pregnant neon 9/5/05 Hi, Please help-I think I've
done something awful. I set up my new tank yesterday, but because the
above neon seemed to be harassed by other fish I put the fish in the
new tank. She seems very stressed, swimming in jerky
movements, in circles. I have turned the light off . My
predicament is: Should I put the fish back with the others or put
another neon in for company? Please advise. <I would add another
neon to this ones tank> Regards and thanks for your assistance
Jacqui <Bob Fenner>
Neon tetra breeding 7/17/05 I am trying to breed my neon
tetras (yes I know this is difficult but that's why I am
trying). I have three tanks set up, one for my males, one
for my females, and a breeding tank. I've done a lot of research,
and have access to every scientific journal, but there is more I
seek. I am curious as to your opinion of the best technique
to sex neon's and in particular the 'candling' method where
you shine light through them and look for ovaries (I have yet to try
this myself). <There are slight coloring differences
between the sexes... handling them, moving them to where a bright light
can be shone behind is not recommended. The folks in the orient who
breed this species just condition, time the spawnings...> Also,
regarding water GH. For the right breeding conditions I need
to get my water down to about 1-2 dGH. <Yes, the lower the
better> I have yet to get below 3 dGH and I'm using
RO water with 1tbsp/10 gal. salt added back <Leave the salt out>
and tetra black water extract (We have pretty hard water in our area).
I'm also using a phosphate free acid buffer to help with the pH
which works very well. Any advice is appreciated. <The 3
dGH should not be a problem. What has been your difficulty thus far?
Getting the fish to spawn? Raising the young, growing sufficient food?
Bob Fenner> Jeramie Abel
Re: neon tetra breeding 7/18/05 Thanks for your quick
reply. My difficulty thus far has mainly been with the
dGH. In just about every literature I've read it
suggests dGH of 1-2. But if you say 3 should work I will try. <Not
much difference in the hardness between 2 and 3> Sexing
them so I can separate them will be accomplished once my second tank is
done cycling (still have high ammonia at this point... waiting for the
bacteria to become established through fishless cycling). I
have not tried any of the subsequent steps although I've had
females become gravid, I just haven't tried to separate them into
the breeding tank because it too has not been ready yet so if they have
spawned, I have not paid much attention to it because I knew I could do
nothing with the eggs and they would be eaten. Currently I
have a gravid female who is hiding out in an ornament (covered stump
that is pretty secluded) but I haven't seen any mating rituals,
however I'm not sure I know exactly what to look for with Neons.
<You will see... there is a discernible fixed action pattern of
orientation, dance, release, separation...> My plan,
should I see some behavior that is unmistakable, is to move the male
and female to the breeding tank with a nice piece of java moss and turn
out the lights. My conditions in the breeding tank are
pH=6.4, temp=74, dGH=3-3.5, ammonia & nitrate =0, no gravel, and it
has an established sponge filter. I plan to feed newly
hatched brine shrimp at approximately 3 days old or when the yolk sacs
are depleted but at this point I've yet to get the opportunity to
try and raise any fry. Thanks for any advice. Jeramie Abel
<Artemia are too big for a first food... do read re
"Infusoria" culture... on the Net, in "old"
aquarium books... Look for the name William T. Innes. Bob
Fenner>