Ptychochromoides vondrozo is a critically endangered

Critically endangered

Version 2010.3 of the IUCN Red List of Threatened Species identified 3744 Critically Endangered species, subspecies and varieties, stocks and subpopulations.Critically Endangered by kingdom:*1993 Animalia*2 Fungi*1745 Plantae*4 Protista-References:...

 species of fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

 in the Cichlidae family. It is endemic to the Mananara-sud river and its tributaries near Vondrozo

Vondrozo

Vondrozo is a town and commune in Madagascar. It belongs to the district of Vondrozo, which is a part of Atsimo-Atsinanana Region. The population of the commune was estimated to be approximately 10,000 in 2001 commune census....

 in southeastern Madagascar

Madagascar

The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

. These are deep and moderate to fast-flowing. Its entire range covers less than 100 square kilometre, which makes it highly threatened from continued sedimentation

Siltation

Siltation is the pollution of water by fine particulate terrestrial clastic material, with a particle size dominated by silt or clay. It refers both to the increased concentration of suspended sediments, and to the increased accumulation of fine sediments on bottoms where they are undesirable...

 caused by deforestation

Deforestation

Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a nonforest use. Examples of deforestation include conversion of forestland to farms, ranches, or urban use....

. It is also threatened by other species that have been introduced

Introduced species

An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

to the region. It reaches about 20.5 centimetres (8.1 in) in length.