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Fundulopanchax gardneri

Fundulopanchax gardneri
Steel Blue Killi
This is a superb beginner's killifish being beautiful, easy to breed and relatively long-lived. It was formerly classed as Aphyosemion gardneri and indeed still is in much of the available literature. It is a member of the subgenus Paraphyosemion. There are many different colour variants in nature and several have been described as subspecies, including F. g. nigerianus, F. g. lacustris and F. g. mamfensis. Obviously, these should not be allowed to hybridise in aquaria and so should not be kept together, although aquarium care them all is virtually identical. 

Interestingly it appears that F. g. gardneri occurs as both an annual and non-annual fish. This adaptation allows it to inhabit many different habitats, as it's able to breed in both permananent and temporary bodies of water.