Chondrostoma regium (Heckel, 1843) [N]—King nase; Arous

Taxonomy. Original description: Chondochilus regius Heckel, 1843a: 1077 [87] [Orontes and Tigris rivers; syntypes: NMW 52532-35 (2, 2, 2, 1) Kueik (Qweik River) near Aleppo, 52536-38 (2, 1, 2) Tigris near Mosul].—Syrian synonyms: None.—Revisions: Elvira (1987: 127); Küçük et al. (2023).—Illustration: Heckel (1843b: pl. 9, fig. 3) as Chondochilus regius, Küçük et al. (2023: 9, fig. 6d).

Status in Syria. Recorded from Syria in original description by Heckel (1843a: 1078) as Chondrochilus regius; subsequently reported by Gruvel (1931); Beckman (1962: 118); Ali (2003).—Syrian material: BMNH, MCZ, MNHN, NMW, NRM, MSL.

Distribution and habitat. Distribution in Syria: Euphrates River drainage.—Distribution in River Basin: 1-Dajleh & Khabour, 2-Euphrates & Aleppo, 4-Orontes.—General distribution: Asia Minor, Middle East: Euphrates and Tigris River systems (Turkey, Syria, Iraq, and Iran).—Distribution in Ecoregion: 437-Orontes, 441- Lower Tigris & Euphrates, 442-Upper Tigris & Euphrates.—Habitat: This species inhabits a wide range of habitats, from medium-sized streams to large lowland rivers. Inhabits marshes and reservoirs, from which it migrates to rivers and streams to spawn. Freshwater.

Economic importance. Commercially important.

Conservation. Conservation status in Syria: Unknown.—IUCN: LC (IUCN 2023).—Threats: There are many threats in the area but none serious enough to threaten this species.—Low sensitivity to human activities.—Not considered as a keystone species.—Decline status: Decreasing.—Low priority for conservation action.