''Salmo macrostigma'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of freshwater

trout Trout are species of freshwater fish belonging to the genera '' Oncorhynchus'', '' Salmo'' and '' Salvelinus'', all of the subfamily Salmoninae of the family Salmonidae. The word ''trout'' is also used as part of the name of some non-salm ...

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

Algeria ) , image_map = Algeria (centered orthographic projection).svg , map_caption = , image_map2 = , capital = Algiers , coordinates = , largest_city = capital , relig ...

in northwest

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

. It can reach a length of TL. The name ''Salmo trutta macrostigma'' (or ''Salmo macrostigma'') has previously been used of many populations also in other regions around the

Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western Europe, Western and Southern Europe and Anatolia, on the south by North Africa ...

, but in recent years those have been split into separate local species. "The other peri-Mediterranean populations reviouslyreferred to as ''S. macrostigma'' belong to several species (e.g. ''S. cettii'' in Italy and ''S. farioides'' in the eastern Adriatic drainages) (Kottelat 1997). In Turkey, besides ''S. rizeensis'', some populations earlier misidentified as ''S. trutta macrostigma'' were described as ''S. tigridis'' Turan, Kottelat & Bektaş, 2011 (Tigris-Euphrates drainage, Persian Gulf basin), ''S. labecula'' Turan, Kottelat & Engin, 2012 (Ecemiş Stream in the lower Seyhan River, east Mediterranean basin), Kartoz and Zindan streams (tributaries of Köprü Stream, a Mediterranean coastal drainage), ''S. opimus'' Turan, Kottelat & Engin, 2012 (Tekir, Fırnız and Göçüksu streams in lower reaches of the Ceyhan River) and Alara Stream (a Mediterranean coastal drainage), ''S. chilo'' Turan, Kottelat & Engin, 2012 (Akdere Stream in the upper Ceyhan River), ''S. okumusi'' Turan, Kottelat & Engin, 2014 (western Euphrates drainage), and ''S. euphrataeus'' Turan, Kottelat & Engin, 2014 (northeastern Euphrates drainage)."

Sources

Fish of North Africa macrostigma Endemic fauna of Algeria Fish described in 1858 Taxa named by Auguste Duméril Taxonomy articles created by Polbot {{Salmoniformes-stub