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Breeding Corydoras Bronze
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I originally purchased a six of these distinctive corydoras, which turned out to be three males
and three females. They were housed in a 36x12x12" tank with a sand substrate and a few plants. The
tank was filtered by an air-powered sponge filter and kept at 24oC by a 200W heater.
Basic water chemistry over the period was as follows: pH 6.4-7.0 ; GH=5-7 ; KH=3 ; NO3
approx. 25ppm. Ammonia and nitrite zero whenever tested. A number of spawnings took place at various
intervals, often apparently triggered by water changes or occasionally when additional filtration
was used to supplement the sponge filter (a box filter containing filter wool and carbon). Fresh
(especially slightly cooler) water or an improvement in the water quality would therefore seem to be
the key to inducing spawning.
Six of the fry from the initial spawning rounds were kept and grew up with their parents to make
the breeding group up to twelve (5 males and 7 females).
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The first sign of spawning was excitable behaviour: swimming vigorously around
the tank and up and down the front glass. The males could then be observed pursuing the females.
This kind of excitable behaviour often continued for some time, and was not always followed by
spawning.
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At intervals, a male and female could be observed locked in the classic 'T-position'. Following
this the female would dash off and distribute eggs, mainly on plant leaves, but also on the tank
glass. Eggs hatched after about 3 days. Only low numbers of fry survived when eggs and parents were
left in the same tank, and it may be advantageous to move one or other to a separate tank to avoid
the eggs/fry being eaten by the parents.
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