Fish of the Tigris River: A Biodiversity Snapshot

The Tigris—rising in Turkey, crossing Syria, defining Iraq—hosts a rich ichthyofauna shaped by flow regimes, temperature gradients, and human alteration (dams, pollution, introductions). Key species:

Cyprinids (Carps, Barbs, Minnows) — Dominant

• Barbus grypus (Tigris barbel) — Large, prized food fish.
• Barbus luteus (Yellow barbel) — Common, adaptable.
• Cyprinus carpio (Common carp) — Introduced, now ubiquitous.
• Hypophthalmichthys molitrix (Silver carp) — Invasive filter-feeder.
• Aristichthys nobilis (Bighead carp) — Invasive, planktivorous.
• Cyprinion macrostomus (Long-snouted carp) — Endemic to Tigris-Euphrates.
• Garra rufa (Redfin garra / "doctor fish") — Nibbles dead skin; spa trade.
• Capoeta trutta (Trout gudgeon) — Cold-water tributaries.
• Acanthalburnus microlepis (Small-scale bleak) — Surface schooling.

Toothcarps & Loaches

• Aphanius mento (Southern toothcarp) — Brackish margins.
• Nemachilus masyai (Masy's loach) — Gravel-bottom riffles.
• Glyptothorax cous / G. platypogon (Stone loaches) — Fast streams, adhesive fins.

Catfishes

• Bagarius bagarius (Striped river catfish / Goonch) — Apex predator, to 2m.
• Clarias gariepinus (African sharptooth catfish) — Air-breathing, invasive.
• Silurus triostegus (Three-whiskered catfish) — Native, nocturnal.

Conservation Notes

• Dams (Ilısu, Mosul, Turkish GAP project) fragment populations, block migrations.
• Pollution (oil, sewage, ag runoff) degrades lower reaches.
• Overfishing targets large barbs and catfish.
• Endemics like Cyprinion macrostomus and Glyptothorax spp. are IUCN-listed.

The Tigris remains a stronghold for Middle Eastern freshwater biodiversity—but the window to protect it is narrowing.