Ram cichlid

Male

Male specimens of the ram usually have the first few rays of the dorsal fin extended, but breeding has made some females also show this. When close to spawning, female rams have a pink or red blush on the abdomen. Females also have a blue sheen over the spot just below the dorsal fin, or a sparse scattering of blue scales in the upper half of the dark spot, and males do not show this. Males are slightly larger than females, with this species reaching 34-40mm.[10][11]

The natural habitat of M. ramirezi is warm (25.5-29.5 °C, 78-85 °F), acidic (pH 5.2-6.7) water courses in the Llanos savannas of Venezuela and Colombia.[5][7][12] The water is generally slow-flowing, contains few dissolved minerals, and ranges in colour from clear to darkly stained with tannins.[5] The species is typically found where cover in the form of aquatic or submersed vegetation is available.[5]

Unfertilized blue ram eggs

Closeup of unfertilized blue ram eggs

The territorial aggression shown between females of M. ramirezi

An electric blue ram cichlid

Once sex mature, the fish form monogamous pairs prior to spawning, and the males do not tolerate other males.[7] The species is known to lay its small 0.9 - 1.5 mm, adhesive eggs on flattened stones[7][12][13] or directly into small depressions dug in the gravel.[5] Like many cichlids, M. ramirezi practices biparental brood care, with both the male and the female playing roles in egg-tending and territorial defense.[5][7] Typical clutch size for the species is 150-300 eggs,[5][6] though clutches up to 500 have been reported.[12] Parental ram cichlids have been observed to fan water over their eggs, which hatch in 40 hours at 29 °C (84 °F).

Female blue ram fanning her eggs

The larvae are not free-swimming for five days, after which they are escorted by the male or the female in a dense school for foraging.[5]

The ram cichlid is named after Manuel Ramirez, an early collector and importer of the species for the aquarium trade.[14] George S. Myers and R. R. Harry (1948) originally described the species as Apistogramma ramirezi, though the species was later moved to and from various genera, including: Microgeophagus, Papiliochromis, Pseudoapistogramma, and Pseudogeophagus.[15]

The xanthistic strain of M. ramirezi

The ram cichlid is popular in the tropical freshwater community aquarium. While some larger cichlids are not well suited for a community tank, if a male and female pair of this specific type are placed in a community tank, they can do well.

Wikimedia Commons has media related to Mikrogeophagus ramirezi.

• List of freshwater aquarium fish species