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Corydoras duplicareus 
(formerly misidentified as Corydoras adolfoi)

by Eric Bodrock

Corydoras duplicareus.jpg (25067 bytes)Corydoras duplicareus (formerly misidentified as Corydoras adolfoi) This beautiful, orange-capped Cory is probably my favorite of them all. In good, adult color, the black band across the back & black mask over the eyes is jet black, bringing out the bright orange on the head even more. I would say they are a medium size as far as Corys go with males growing to 4.5 cm and females a little larger, to 5 cm. My spawning group of eight adults, half male and half female, is housed in system "A". This tank does vary from the other tanks on the system in one manner; the overflow, drainpipe was lowered by about 3 inches. The reason for this is because of their unusual spawning method.  When they lay their eggs they like to place them close to the surface and in the corners too. I have even found eggs as much as 3-4 mm out of the water! As odd and unusual as that is, it's even more bizarre that half the eggs in the spawn will be buried deep into a sunken mop - talk about extremes! Anyways, by keeping the water level lower, it is easier to spot eggs and reach them if you want to move them into a hatching tank. Their eggs are sticky, not the stickiest of all Corys, (like C. matae), but they will stick to your finger the first time you touch them as you roll them off the glass. Their eggs are quite large, 2 mm or maybe even a smidgen more. When first seen, if they are viable eggs, they appear to be dark in color; brownish sort of, in the middle and fading to a lighter gray/cloudy color towards the outside. As with all Corys, when the egg is snow white it is not a good, viable egg and will not hatch. Hatch ratio of the eggs to the amount they lay is very high, over 90%, nearly 100%. Spawns aren't large in size. My largest spawn contained around sixty eggs, though it is possible that two females spawned at once because spawns normally range between six and twenty-five eggs. Also, it's not uncommon for the spawning group to lay several eggs a day over the course of a few days. Spawning usually occurs during the daylight hours, and just not in the morning, but nighttime spawns are not out of the question! My parents have never bothered their eggs. I know a handful of folks that raise their fry in the tank with the adults with just a bunch of ground cover for the fry to hide in. Fry grow pretty quick. At 1 cm in length you can just start to see their orange cap develop and at the same time the band on their back and over the eyes start to darken. By 15 cm they show exact adult coloration, cute as can be!       

   

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