Rivulus pinima, Costa 1989

History

Alternative name Melanorivulus pinima.

Dr. Wilson Costa described this Melanorivulus pinima in the year 1989 from material that was discovered by Persio Souza Santos Filho on 13 January in 1976

The fishes from the type locality lived at the municipio de Rio verde, 37 Km east of Jatai, along the road BR 364 towards Goiâna, estado de Goiâs. The types are stored in Sao Paulo at MZUSP nr. 39978.

 

 
Rivulus (Melanorivulus) pinima - male. Fieldcode HVP 16-21. Image made and provided by W.J. Hoetmer, The Netherlands.
Rivulus (Melanorivulus) pinima - male. Fieldcode HVP 16-21. Image made and provided by W.J. Hoetmer, The Netherlands.
Rivulus (Melanorivulus) pinima - male. (BR 93-15) Image made by F. Vermeulen.
Rivulus (Melanorivulus) pinima - female. (BR 93-15) Image made and donated by Francisco Falcon, Brasil.

Reproduction

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 :

 


Variations
Rivulus (Melanorivulus) pinima - male. Image made and donated by Oliver Helker, Germany.
   

Map
 

Meristics

Max. size 5.0 cm.
Dorsal 8.7,
Anal 12.8,
D/A 8.5,
LL scale count (average)35.2
Pre- dorsal length to % SL – 76.4 %

   

Literature

Costa, W.J.E.M. 1989. Descricao de cinco Especies de Rivulus das Bacias dos Rios Parana e Soa Francisco (Cyprinodontiformes, Rivulidae). Revta. Bras. Zool., 6 (3): 528, figs. 4-4a.

Costa W.J.E.M., 2007. A new species of Rivulus from the Claro river drainage, upper Paraná river basin, central Brazil, with redescription of R. pinima and R. vittatus (Cyprinodontiformes: Rivulidae). Ichthyol. Explor.Freshwaters, Vol. 18, No. 4, pp. 313-323, 7 figs., 2 tabs.