[Ebook] 500 freshwater aquarium fish – Killifish – Blue Killifish (Aphyosemion filamentosum)
The males of some populations of this species, such as those from southern Togo, possess a great deal of blue on their bodies, hence one of the common names. Confusingly, some other populations from the same region are orange-red. Most populations from other locations contain varying amounts of blue, orange-red, and reddish brown.