Onilahy River
Encyclopedia
Onilahy is a river in Toliara Province
, southern Madagascar
. It flows down from the hills near Betroka
to the Mozambique Channel
. It empties at 23.5666667°S 43.75°E.
Two species of cichlid
s are endemic to the river basin, but Ptychochromis onilahy is probably already extinct and the remaining range of Ptychochromoides betsileanus
covers less than 10 square kilometre.
Toliara Province
Toliara is a former province of Madagascar with an area of 161,405 km². It had a population of 2,229,550 . Its capital was Toliara...
, southern Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
. It flows down from the hills near Betroka
Betroka
Betroka is a hilly city in Anosy Region in southern Madagascar, and is the source of the Onilahy River...
to the Mozambique Channel
Mozambique Channel
The Mozambique Channel is a portion of the Indian Ocean located between the island nation of Madagascar and southeast Africa, primarily the country of Mozambique. It was a World War II clashpoint during the Battle of Madagascar...
. It empties at 23.5666667°S 43.75°E.
Two species of cichlid
Cichlid
Cichlids are fishes from the family Cichlidae in the order Perciformes. Cichlids are members of a group known as the Labroidei along with the wrasses , damselfish , and surfperches . This family is both large and diverse. At least 1,300 species have been scientifically described, making it one of...
s are endemic to the river basin, but Ptychochromis onilahy is probably already extinct and the remaining range of Ptychochromoides betsileanus
Trondo mainty
The trondo mainty is a critically endangered species of fish in the cichlid family. It is endemic to the Onilahy River Basin in southwestern Madagascar. Its remaining range covers less than , and it is highly threatened by habitat loss, fishing and competition/predation by introduced species...
covers less than 10 square kilometre.