I've created this online diary because
I want to breed Iriatherina werneri (Threadfin rainbowfish) and I
couldn't find enough information how to breed them efficient
in European climate.
The biggest problem by raising fry is to offer them the "right food"
within the first days. Due to our cold climate it's not possible to
breed them in ponds without heating the ponds except 1 or 2 months a
Even the adult I. werneri's mouth
is so small and their throat is so narrow that they can eat only
crushed flake food. Newly hatched brine shrimp is a perfect food for
them, also other small live food. So the problem that occurs with I.
werneri fry is that newly hatched brine shrimp are to big for them.
Several people told me that you will see a difference in raising
them with tiny live food (plancton, infusoria, etc...) and feeding
You see, the problem is feeding
them right the first days !
So far my breeders lived in a
heavily planted 240 L tank together with Melanotaenia Praecox and
Pseudomugil signifer. I'm keeping 6 male and 7 female I. werneri.
My plan is to use a 54 L tank
(60X30X30 cm) as a breeding tank, setup :
- Fluval 2plus internal motor
Dennerle BIO CO2 with diffusor "micro
- Jaeger 50 W heater
- 1 Dennerle 15 W Trocal de Luxe
special plant light
turned on 2 X 5 hours with a break of 4 hours (helps avoiding
- 6 cm high 2-3 mm gravel
- background plants : rotala
rotundifolia, rotala macranda + wood with moss
only half of the background is planted
- 2 male and 6 female Iriatherina
werneri, no other fish...only some snails ;-)
I will try 3 different methods of
breeding I. werneri. One is only possible during German summer, the
others 12 months a year. I will definitely not leave the adults with
the fry in the same tank because I know that they will eat their fry
in a tank of that size.
- Method 1
I will setup a small 150 L outdoor pond with some plants in
pots. Because of our cold climate I will use a heater especially
for the night. When the I. werneri lay eggs in the moss, I will
move the moss to the tub. Hopefully there will be enough plancton
for them to grow up and survive the first days. I'll feed them
with newly hatched brine shrimp when they're big enough.
- Method 2
When they lay eggs on the moss, I will move the moss to a 25 L
tank and feed them with infusoria. Hopefully I will succeed in
letting a culture grow for some weeks....fingers crossed!
- Method 3
This is the last method that I will try. When the I werneri
lay eggs, I will put the adults back into the show tank and try to
raise fry in the 54 L breeding tank feeding them with Sera micron
and JBL NobilFluid.
I could imagine a fourth method but
I'm not sure if that will be possible for me. If I established a
second tub I could keep the breeders in the tub and use mobs. The
breeders could stay in the tub and I change only the mobs to put the
eggs into a 2nd tub. I've no
idea if I will do this but I think it might work.
If you've any information for me
what can be improved or done different or whatever.....each useful tip is
extremely welcome. I'm really glad if you send me an
email or post a reply to the Iriatherina werneri breeding topic