The emerald aphyosemion (Fundulopanchax scheeli) is a species of killifish, endemic to the lower Cross River basin in Nigeria. It is a coastal rainforest fish which lives in small streams and ponds. It prefers a temperature of around 75°F, and a slightly acidic pH around 6–7.[1] The specific name honours the Danish count, army colonel, explorer and ichthyologist Jørgen J. Scheel (1916–1989).[2] F. scheeli grows to a maximum size of 6cm (02inches) total length. It is considered to be critically endangered by the International Union for Conservation of Nature due to its very small area of occupancy and faces threats from herbicides and pesticides used in agriculture, such as in rice farming, and from deforestation.