Alternative name Atlantirivulus jurubatibensis.

Rivulus jurubatibensis is an R. santensis group species from a coastal swamp close to the Lagoa do Pires, Quissamã, Rio de Janeiro, southeastern Brazil. It is distinguished from all other R. santensis groups' species by having fewer scales in the longitudinal series. Rivulus jurubatibensis is closely related to R. nudiventris by sharing two unique color patterns: caudal fin light yellow with a broad gray stripe on the whole fin margin in males and a small horizontally elongated black spot on the dorsal portion of the caudal-fin base in females. Rivulus jurubatibensis is distinguished from R.nudiventris by the presence of pelvic fin and by having fewer caudal-fin rays and fewer anal-fin rays.

Keeping and breeding is easy, but a good cover of the aquarium is necessary because their ability to jump, even trough the smallest opening, is unbelievable. If there is enough space for the fishes, this species can be housed in a tank with more males than one only combined with several females. If separated before and brought together again, males can become very aggressive and fight to dominate others. An excellent way to get offspring is by bringing a pair or a trio in a small tank from 10 liters with a small filter in it. Some peat moss or dark gravel at the bottom, diffuse light, and a floating "mop" will give space for laying their eggs. If they get a rich varity of life food, the fish will spawn during their 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 Acraflavine to the water you store the eggs to prevent fungi from coming up.

After hatching, the young fry can eat freshly born 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 significant 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 learned that lower pH levels during hatching gave a higher percentage of females. To achieve this, I use some peat moss to add to the container with the eggs before they are ready to hatch. This peat moss also is an excellent way to prevent eggs from becoming attacked by fungus. The lifespan of most Rivulus (Atlantirivulus) can be up to 3 years in captivity.

Remarks :

The species is not in the hobby yet. First life material is needed for deepened information about their way of breeding and behaviour.

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