Corydoras acutus, Cope, 1872
Origin:South-Amerika, Equador, Pastaza-Jatun Cocha at rio Yasuni, Rio Napo system. Peru, Loreto, Rio Ampiyacu, Rio Yavari, Rio Huytoyacu.
Etymology: Acutus(L)=Sharp, referring to the snout.
Synonyms: C. stenophalus
Description:Bodycolour beige, Dark spots on the side, fins clear, except for dorsal(black blotch) and tail with small spots which form vertical stripes.
Care:Frequent waterchanges and a reasonable current.
Feeding:Make sure they do get some food occasionally. A small feeding after the light can solve feeding problems.
Breeding: Has been bred under aquariumconditions. Use a standard breeding tank for corydoras ( See Corydoras breeding tank). Feed the fish well for 2-3 weeks, and perform weekly 10% waterchanges. Keep the temperature at 24 °C.Then perform a 50% waterchange with colder water. Temperature may sink to 16-19°C. Normally this will induce spawning. (Do not turn of the heater, let the temperature return to normal).
If this doesn't induce spawning, continue 50% colder waterchanges every other day. Lowering the waterlevel for a period of time may also help. Using a watersoftener, and changing the pH towards neutral or a little acid may also help.
Eggs are approximately 1.5 mm, mostly on the glass corners. Remove the eggs or the parents(better). After 4 days the eggs will hatch. Keep the water very clean by performing daily waterchanges. Feed small portions(artemia or ground flake) several times a day. Keep the waterlevel low, and the temperature of the air equal to the watertemperature to prevent colds.
Adult colouration is reached in 8-10 weeks.
Sexual dimorphism:Check from above, females are more triangular in shape, they are fatter behind the gills, while males are equal or thinner behind the gills.
Additional:The dark blotch in the dorsal fin can vary in intensity depending on the environment.
References: Lambourne, D.(1995); Hieronimus, H.(1997).
All images, information, text, and other information/items in this site © Aquaworld website as described in the Berne convention.