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|Spawning of the "Broad Banded" Corydoras adolfoi|
by Adrian Payne
first saw this Corydoras adolfoi look alike in February of this year when a few turned up in a tank at Wholesale Tropicals (London), but unfortunately they were all sold. It was not until Wholesale Tropicals imported several boxes of these fish as C. adolfoi that 1was able to obtain several specimens. At first glance you could be mistaken for thinking that the two fish are the same, but it is when the fish are seen side by side that the differences between them become obvious. In C. adolfoi the black band that runs down the spine from the dorsal fin to the caudal fin, starts wide and runs down to a point. In this new type, the black band, apart from being wider at the dorsal fin, runs roughly parallel with the spine to the caudal fin. This black band can vary in width from fish to fish, in my specimens it varies from approximately 4mm to 6mm, in fact in one female the band is so wide that it stretches almost to the lateral line of the fish.
The fish are housed in a 24
x 12 x 15 tank with swimming pool sand for a
substrate and decorated with bogwood and Java
moss. The tank like the majority of the tanks
in my fish house is filtered by an internal box filter
containing gravel and filter wool. One evening in
September whilst checking the tanks prior to feeding
I noticed an odd egg stuck in the far left hand corner
of the tank about two thirds of the way up the glass.
As I watched one of the females swam straight up to
the egg and ate it! Instant panic. Was I too late
or had the rest of the eggs been eaten? fortunately
not, on lifting up the clump of Java moss I found
forty eggs spread right across the base of the plant.
Every egg in the Java moss was as close to the substrate
as possible and certainly not more than a couple of
millimetres above the sand. Another difference between
these two fish is the way in which they spawn. C.adolfoi
will normally lay their eggs all over a tank,
in the corners, on the sides and all over plants.
This broad banded type, it seems only lays its eggs
during low runs over the substrate. Apart from the
one egg seen to be eaten by a female no other eggs
were found other than those in the base of the Java
moss. Unfortunately the actual spawning was not witnessed
but on every occasion the eggs have always been laid
in a similar position. Each egg is 2mm in size and
on being removed from the tank were placed into a
container containing filtered rain water and a drop
of Myxazin. The first eggs started to hatch after
four days with the rest hatching on the fifth day. The
temperature of the water, in the hatching container
being 75 - 76F.
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