y group of 8 wild caught C.
adolfoi spawned for the first time in my tank only
3 weeks after purchasing them. In those 3 weeks, I provided
lots of nutritous and varied food (frozen) such as red
mosq. larvae, freezedried tubifex, sinking Hikari Cory
food tablets, frozen brine shrimps and so on, JBL Krill
flake food now and then as well. I tried to not give the
same food two days in a row for variety.
The tank is not very brightly lit,
only one light tube of that kind you use for plants (kind
of pinkish light in them). They seem to feel safest when
the light is not to bright, roots for cover, and a lot
of fast growing plants and sand at the bottom as substrate.
I usually change 10%
of the water each or every second day, and kept the ph
at 6.7. The hardness isn't much to talk about in my tap
water, kH is 1 and gH is 1 or 2. Very soft in other words.
After the first spawning there has been little efforts
made to make them spawn again... they do it anyway:)
They spawn almost constantly, and have been doing so for
7 months now. Only a short break for 3 weeks in February,
but then they started again and have spawned EVERY week
since then. I have raised some of the fry, and currently
I have about 20 about 5 and 6 months old. I stopped picking
out the eggs before the summer started, since vacation
time was coming up.
The adults usually eat the
eggs stuck on the glass, but the ones in the java moss
they seem to leave alone. It's always only one breeding
pair at the time (one female and one male), the rest of
the group does not participate. The spawning pair themselves
never eat the eggs, but the rest will if given the chance,
so I usually sit guard and pick the eggs out one by one
as they lay them:-) (what a job...)
My best tip for hatching
the eggs is to take a filter stocking, stuff it with peat,
and leave it in the hatching container. So far, no eggs
have fungused with this method, but remember to change
the water a day before hatching! The water gets very acid
with the peat, and it's best to change it before hatching
since it's much more difficult to make any changes at
all AFTER the fry have emerged. They can die even if the
temperature changes as little as 2 degrees celsius.. in
other words, very sensitive fry .
I feed my fry with freshly hatched
brine shrimps for the first four to five weeks, then I
slowly introduce other foods. C. adolfoi can
be hard to raise if you don't feed them newly hatched
brine shrimp because they don't touch other foods, in
my experience. they just die of starvation. Keep the tank
CLEAN, daily water changes of 95%. Sounds much, but it
does the trick. Remember to keep both temperature and
P.h at the same on the new water as the water in the tank!.
I also clean the tank every day for the first weeks, by
scrubbing it in hot water. Much work, but the survival
rate is high :)
My first brood of C. adolfoi had a 100% survival
rate with these methods :-) (this was my first try ever
at breeding Corys...) I picked out 11 eggs, 9 of them
hatched, and all 9 are now happily swimming around in
one of my tanks. They are 6 months old now.
Click on the thumbnails below for a full image of the
frys growing progress.
old, still with yolk sac
I would like to point out some interesting fact regarding
these particular photographs. They all show the adolfoi
in spawning mode. NOTE the silver ring
around their eyes! Normally, their eyes are totally black
with no silver ring. But on the day they are planning
to spawn, this silver light ring shows up in their eyes.
Interesting, isn’t it?
The first 2 photos shows this phenomenon
most clearly, as the pair was actively spawning right
at that moment. I have taken several photos of this, and
all the pictures show different degress of that silver
ring around the eye center.