Alternative name Oditichthys pacificus.

The subgenus name was changed from Cynodonichthys to Oditichthys by J Huber, D. Mejía & F. Vermeulen in K-D Series 2023.

The male in the second image on the right was collected in 2014, by D. Mejía, Bogotá, Colombia, who specializes in poison frogs, close to the original type locality Rio Condoto, a tributary of the upper San Juan River. In the year 2022, the author, together with D. Mejía, went again to the Choco Dpt., to collect more material of this species and to photograph them alive, and study a series of samples scientifically. In the process, it became clear that this species should be removed from the subgenus Cynodonichthys and included in the subgenus Oditichthys and this was made known in a redescription in a study in 2023. The area is known to be dangerous because of frequent riots and the presence of Colombian freedom fighters. The photo at the top shows an adult male R. pacificus from "La Ye," a locality slightly north of Condoto, the type locality, also located in the Atrato basin.

Keeping and breeding is easy but a good cover of the aquarium is necessary because there ability to jump, even true the smallest opening, is unbelievable.

This species can, if there is enough space for them, housed in a tank with more males than one only and several females. If separated before and brought together again however, they can be very agressive to each other and fight to become dominant to others. The best way to have much offspring is to put a pair or an trio in a small tank from 10 liters with a small filter in it or with some airation. On the bottom some peat moss or dark gravel and a floating "mop" to give space for laying there eggs. The fish will, if they become a rich varity of life food, spawn during there whole adult life and produce daily between 5 to 15 eggs.

The eggs should be collected by hand and stored for about 14 days in a small container. Eggs are 1.6 mm and amber colored. It is wise, to add to the water you store the eggs in, some acryflavine to provent fungus coming up.

After hatching the young fry can eat fresh artemia nauplii without any problem. It takes 4 to 5 months to raise them to maturity. Often the number of males is far above the number of females. For some species this can become a major problem for the breeder as he has to raise many young fishes and so become able to distribute a few pairs to other hobbyists. Recent personal tests laerned that lower pH levels during the time of hatching gave a higher percentage of females. To achieve this I use some peat moss that I add to the container with the egss just before they are ready to hatch. This peat moss also is a good way to prevent eggs to become attact by fungusses.

There lifespan can be up to 3 years in captivity.

Remarks :

Max. size 7,5 cm.
Dorsal 9.0,
Anal 10.1,
D/A 8.5,
LL scale count (average)37.0
Pre- dorsal length to % SL – 77.0 %
Depth to % SL – 19.0 %

Huber, J.H. 1992. Review of Rivulus. Ecobiogeography - Relationships. Cybium Suppl., Societe Francaise díchthyologie Publ.: 351. fig. 67.

Huber J, D. Mejía-Vargas and F. Vermeulen, 2023. Two new Rivulus sp. from north-western Colombia, after a redescription of Riv. pacificus (Cyprinodontiformes, Rivulidae). Killi-Data Series 2023. Tab 4, Fig 14.