The first recorded spawning of Corydoras guianensis Nijssen, 1970

by Mel Rushmore


I first purchased 13 of these rare Suriname cory's in late May of 2018 and let them settle into my old fish room while I was building my new one and only transferred them to the new fish room at easter this year (2019). This much sought after species comes from the coastal rivers of Suriname and French Guiana with the type locality of a creek on the right bank of Nickerie River, 12km of Stondansi Falls, Suriname. Corydoras guianensis is placed in Lineage 9, the "short-snouted" species with the designated type species: C. punctatus. A revision in the future would constitute the resurrection of the genus name Hoplosopma (Agassiz, 1846).

I actually ordered a full box from Michael Huthart of Northern Aquatics as a result of being kindly given a group of 4 male CW015 which had themselves been imported as C. guianensis however the females that also arrived with them did not make it through import and quarantine. In a later shipment I was expecting to receive CW015 but also hoping that I might get a mix including females to go with the males Ian Fuller of Corydoras World had kindly given me. When the box finely arrived they were all C. guianensis and I was greatly thrilled.

 

Corydoras guianensis - male

Corydoras guianensis - male

 

Corydoras guianensis - female

Corydoras guianensis - female

They are kept at 25 degrees (77°F) dropping to around 21-22°C (67-71°F) with water changes, p.h is 6.5, tds was 99 at the time of the spawn and they laid mainly on a moss ball and the underside of java fern with one or two on the filter and glass. Eggs were laid between 2 and 4 at a time and very sticky so I split the batch and tubbed them separately using my preferred Esha 2000 anti fungal in one tub and a small alder cone in the other for the first 24 hours. I use Esha as its easier to gauge a dose but interestingly the tub with Esha despite having fertile eggs didn't yield any young at all but the ones I did get were in the tub with the alder cones. The eggs were around 1.75 mm in size.

 

 

Distrbution: Coastal rivers of Suriname and French Guiana. Type Locality: creek at right bank of Nickerie River, 12km of Stondansi Falls, Suriname.

 

Eggs on a moss ball

 

Corydoras guianensis - newly hatched fry

 

I have only nine live fry at the time of asking (22/10/19) but only one maybe two females spawned from six plus in my group of 13. To be honest I think I pulled the eggs a little bit too early but the group arrived wild caught with youngsters in the mix which are only just maturing and I was prepared to risk damaging eggs over them potentially being eaten.

The water in both tubs was changed at 50 percent daily until day of hatching, 3-4 days, with water taken from the parent tank and when hatched fry were moved to a new tub again filled with water from the parent tank.

 

Corydoras guianensis - newly hatched fry

I sincerely thank both Ian Fuller for that gesture and Michael Huthart for importing the fish for me without them I would not have them as there was no planned repeat orders from the Suriname.

 

Spawning details

Species: 6 females, 7 males
Tank:
Width 30cm (12ins) x Depth 45cm (18ins) Height 28cm (11ins) with sand substrate, java fern and mossballs with a sponge filter.
Temp: 21-22°C (67-71°F)
P.H.: 6.5
Conductivity: 99
Eggs: 50 with a 36% hatch rate. 1.75mm size.
Further info:
Corydoras guianensis

References

Ian A. M. Fuller & Hans-Georg Evers (2011). Identifying Corydoradinae Catfish Supplement 1. Ian Fuller Enterprises.
Markos A Alexandrou, Martin I Taylor: 2011; Evolution, Ecology and Taxonomy of the Corydoradinae Revisited.
Encyclopædia Britannica: www.britannica.com/place/Suriname

Photo Credits

Author
Encyclopædia Britannica

 

Donate towards my web hosting bill!

 

If you would like to contribute an article, please e-mail me. You will of course be credited for your work.

If you would like to donate any denomination of money to the site just click the above link button. All proceeds will go to running the site and hopefully to keep it going for a few years yet.

Print or e-mail this factsheet below

 

Print Friendly and PDF