Meridionalis Eartheater

Gymnogeophagus meridionalis is a graceful smaller eartheater from the lower Paraná and Uruguay river systems, extending into the estuary zone of the Río de la Plata. It is distinguished by delicate reddish edging on the unpaired fins and subtle iridescent scaling on a silver-olive body. Its adaptation to cooler, well-oxygenated large river conditions makes it ideal for unheated aquaria.

Among the smaller Gymnogeophagus species, G. meridionalis fits comfortably into medium-sized community setups and is one of the more manageable eartheaters for newcomers. It does not require the large tank footprint needed for tropical eartheaters and is tolerant of a wide range of tankmates due to its low aggression levels.

Breeding is triggered by seasonal temperature cycles in the wild. In captivity, a spring-like temperature increase combined with quality live food conditioning will stimulate spawning. Biparental fry care is attentive and both parents can be quite defensive around the spawn.

Water: 16-24°C, pH 6.5-7.8, soft to moderately hard (2-15 dGH); well-oxygenated water important. Tank: Minimum 120L; fine sand, flat spawning stones, robust plants compatible with cooler temperatures. Feeding: Sinking pellets, frozen bloodworm, daphnia, Artemia nauplii; varied diet maintains fin colour. Breeding: Open substrate spawner; biparental care; spring temperature rise triggers spawning naturally. Compatibility: Peaceful; excellent with danios, barbs, larger tetras, corydoras, and temperate loaches.