Simpsonichthys Myersi

Datasheet

General Description

Simpsonichthys Myersi belongs to the category of aplocheiloid-toothcarps within the classification order Cyprinodontiformes. It has a somewhat convoluted taxonomic history, with ongoing debates on its classification with species like S. izecksohni. The species is distinguishable by specific physical characteristics, such as filamentous rays on the anal fin of females, asymmetrical caudal fins in males, and specific color patterns on the caudal peduncle.

Aquarium Setup

For housing Simpsonichthys Myersi, a dark substrate is recommended, accompanied by floating vegetation to provide a sense of security and refuge, especially for sub-dominant individuals. Decor should include a spawning medium for breeding purposes, with filtration through an air-driven sponge-type unit, given the fish's tendency to jump. It is advisable to have a tightly-fitting cover for the aquarium. The water conditions should have a hardness of 18-90ppm, pH range of 5.5-7.0, and a temperature between 20-27°C (see table).

Behaviour

It is ideal to maintain Simpsonichthys Myersi in a species-specific arrangement with 2-3 females per male to prevent aggression within the group. These fish are known to display territorial behavior, especially during mating periods, and may require adequate space and hiding spots in the aquarium to minimize conflicts.

Feeding and Diet

As natural micropredators, Simpsonichthys Myersi thrives on small live or frozen foods such as Daphnia, Artemia, whiteworm, and mosquito larvae. It is crucial to avoid offering high-protein or fatty foods excessively to adult specimens to maintain their overall health.

Reproduction & Dimorphism

During the reproductive cycle, adult Simpsonichthys Myersi perish when their habitats dry up, leaving fertilized eggs encased within the substrate. These eggs endure a period of diapause until the rainy season triggers hatching. Males exhibit slight size differences compared to females and develop distinctive filamentous extensions on their fins as they mature. Males also display a unique color pattern with crimson to dark brown bars on a brownish yellow to greenish blue backdrop, while females have a different coloration with broad dark grey bars on a pale brown base.

Habitat and Distribution

Found in ephemeral, shallow depressions, pools, and swamps nourished by rainwater in the eastern Brazilian coastal plains, Simpsonichthys Myersi is native to regions spanning from the rio Jucuruçu in southern Bahia state to the rio Doce in Espírito Santo state. Their habitat becomes completely arid during specific months each year, with all adult fish perishing until the rains return, triggering the hatching of eggs that have been in diapause.