Apistogramma Agassizii. Here is some information about Apistogramma: Habitat and Distribution: Apistogramma is a genus of freshwater fish originating from tropical and subtropical South America, precisely in the lowlands east of the Andes mountains. General Characteristics: This genus consists of about a hundred species, making it the species-richest cichlid genus in America, along with Crenicichla. Behavior: Apistogramma are generally territorial, especially towards fellow species or other fish