大口双鳍鰕鮰

<em>Aphyosemion abacinum</em> is a slender freshwater killifish classified within the family Nothobranchiidae, the African killifishes. This diminutive species typically attains a maximum length of approximately 3.5 cm, placing it among the smaller representatives of its genus. Nothobranchiidae encompasses a diverse array of annual and non-annual killifishes distributed across sub-Saharan Africa, many of which are celebrated for the vivid coloration displayed by males during the breeding season. <em>Aphyosemion abacinum</em> is native to equatorial West Africa, where it inhabits slow-moving or standing freshwater bodies such as forest streams, pools, and seasonal swamps characterized by soft, acidic, and tannin-rich water. The species is adapted to environments that may experience significant seasonal variation in water levels and temperature. In the wild it feeds primarily on small invertebrates, aquatic insects, and zooplankton. <em>Aphyosemion abacinum</em> is a non-annual killifish, meaning its eggs do not require a dry diapause phase to complete development, distinguishing it from many of its annual relatives. Among aquarium hobbyists it is appreciated for its manageable size and relatively peaceful disposition. A species-appropriate setup typically includes a well-planted tank of 40 liters or more with soft, slightly acidic water, a dark substrate, subdued lighting, and a secure lid to prevent escape. A temperature range of roughly 22 to 26 degrees Celsius is generally suitable. Details of broader habitat and range for this species remain limited in the ichthyological literature.