breeding part II
- 25 L tank
This evening I removed moss from my 54 L breeders tank and put
it into my small 25 L tank.
There is no gravel in the tank only the swimming moss which I will
remove after 8 days when hopefully all fry are hatched. I'm using
a sponge filter.
I have been doing only weekly waterchanges in my breeders tank for
two months now. Waterchanges are done with rainwater, KH 2° and pH
7.0 - 7.5.
They haven't got much bbs during the last weeks, only Cyclop Eeze,
crushed dried Daphnia and some crushed flakes. Temperature was 30°
Since a few weeks my Threadfin breeders live together with 5
couples of Pseudomugil gertrudae. The gertrudae are approx. one
year old and I guess the've already reached sexual maturaty. This
means there might be eggs of both in the moss.
After hatching I'll move the fry
immediately to the outdoor tub. This has to be done extremely
carefully because werneri fry very often die very fast by injuries
caused by a net. This is an experience I made by my last werneri
breeding. I will just move a simple water glass along the surface
to catch them.
- 25 L tank
One evening later I found the first single tiny fish. I'm a little
bit spoiled from last time when I found 25 little fry the next
morning. So I have to be patient and wait a few days.
One thing's for sure - I can't put those 4 mm fish together with
the juveniles in the outdoor tub. I'll to put my bigger fry from
the tub to their siblings in the 112 L tank.
08.07. - 25 L
Nothing happened, just one tiny fish. I will call
him Robinson Crusoe. It's obviously not so easy to get a big
number of eggs and fry. The daily water changes and lots of
artemia feeding I did last time must have made sense. If I won't
see any positive results within 4 days, I'll put the moss back to
the breeders tank.
liter breeding tank, 50% waterchange, 30° C., KH 3°, pH 7.5
I started doing waterchanges at least the other day and feeding
lots of brine shrimp. This is what I think was the reason for
getting a big number of eggs and fry last time. I'm not really in
a hurry but September will be the last month where efficient
breeding will be possible for me. I'm still dreaming of a heavily
planted 150 X 60 X 60 cm tank (540 L) only for I. werneri and P.
gertrudae. That would be a nice project starting October ;-)
tub, 30° C
I moved all larger fry to the 112 L tank now which means the
outdoor tub is prepared for some (hopefully hatching;-) new fry.
4 weeks old
4 weeks old
I haven't measured pH and KH continiously in my breeders tank. I
used ion exchanger water last time and rainwater now, I didn't feed
brine shrimp for a while. Last time I mixed water from an ion
exchanger with tap water , so I had always control over KH and pH by
the mixing ratio and I could keep temperatur warm by using warm tap
water. Now the rainwater that I collect in an underground cistern
has also 2° KH but pH is between 7.5 and 8.0. I don't get pH down to
6.5 by adding BIO CO2. Only a professional CO2 system as I use it in
my 240 L show tank can do this job ! I did only weekly water changes
during the last weeks.
My conclusion after 2 breeding attempts ......
ratio 1:2 for the breeders
* pH 6.5 - 7.0, KH 2°-3°, temperature 30-32° C.
* water changes at least every other day (25%)
* feeding brine shrimp and Cyclop Eeze 4 times a day
* A breeding tank that's at least 60 cm long with a lot of moss
no guarantee for success but the probability is increasing extremely
- 25 L tank, 30% waterchange, KH 3°, pH 7.0, 30° C.
Today I found 3 more fry which I moved immediately to the outdoor
liter breeding tank, 25% waterchange, KH 2°, pH 7.0, 30° C.
I'm feeding brine shrimp and Cyclop Eeze 4-5 times a day and the
Threadfins look very
nice. The males show phantastic colour while mating. Maybe the
gertrudae eat the eggs in the moss. The werneri have never been
interested in the moss but the gertrudae are searching for food in
the moss very often.
- 10.07. - 25 L tank, 20%
waterchange, KH 3°, pH 7.5, 30° C.
Today I moved 13 more little fry to the outdoor tub so there are
17 little fish in total.
- 54 L breeding tank,
25% waterchange, KH 2°, pH 7.0, 30° C.
There is nothing special to report, my Threadfins look great and I
think they are spawning permanently. Feeding brine shrimp 4 times
a day shows results. I will remove moss one more and see what's
gonna happen. If there are only 20 little fish again it might
actually be that the gertrudae eat eggs. Then I will put 5 adult
I. werneri (2 male, 3 female) to the 25 L tank with the moss.
- 12.07. - 54 L breeding
tank, 25% waterchange, KH 3°, pH 7.0, 29° C.
Nothing spectacular to report, everything is fine in this tank. I
installed a new BIO CO2 bottle two days ago which started
production yesterday evening. This will hopefully keep pH slightly
below 7.0 in combination with 2° KH.
- 25 L tank, waterchange
25%, KH 3°, pH 7.5, 30° C.
I found 10 more fry today, in total it's not a big number but it's
not the desaster I expected after the first 2 days ;-)
I don't get pH down in this tank but I don't worry about that
because all fry move to the outdoor tub the same day. Adding CO2
doesn't make sense because I won#t find the right dose at all and
risk ill or dead fry. That's not worth it.
- 13.07. - 25 L tank,
7 more little fish moved to the outdoor tub.
I ordered to pH meters for my 54 l + 25 L tanks so using drops
will have an end and I'll have pH values available permanently.
- 14.07. - 54 L breeding tank,
25% waterchange, 2° KH, pH 6.8, 30° C.
- 25 L tank - 25%
waterchange, KH 2°, pH 7.0, 30° C.
5 little more fish that moved to the outdoor tub. I will remove
the moss tomorrow and substitute it by new moss from my breeding
- outdoor tub, 30%
waterchange, 30-34° C.
Summer is back....temperature heas been increasing from 14°
C. up to 35° C. within 2 days which means I have at least 30° C.
in the tub now. It's incredible,you can see already a big
difference in colour and size of the I.werneri fry after 2 days.
- 17.07. - 112 L juveniles
Today I found fry in this tank. The
oldest fish in this tank hatched on 25.05.2007, which means they
are not even two months old. So I moved already 13 little fish to
the outdoor tub today and some more will follow. In the 112 L I've
also been doing small 10-30 % waterchanges 3-5 times a week and
fed a lot of newly hatched brine shrimp
- outdoor tub
Two days ago I put some moss from my breeders tank into
a net that's hanging in the outdoor tub and what a surprise... the
first fry hatched last night.
I think I will stop this breeding diary now
because it's becoming a never ending story
;-))). I found out different methods of breeding Iriatherina
werneri and it depends on the situation which method I'll use in the
future. If you've any questions regarding breeding these wonderful
little fish, please feel free to contact me.