Ocean Atlas · Animals

Rays

Bowmouth guitarfish

Rhina ancylostoma

A heavy, patient ray with a shark-like tail, resting low over sand and coral. Bowmouth guitarfish are rare, and every sighting is a privilege, never a promise.

Critically EndangeredIn 8 Atlas countries

Critically Endangered (IUCN, 2019) means it faces an extremely high risk of extinction in the wild. The assessment found declines of more than 80% across its range over about 45 years, with fishing the main pressure.

Length

Most sources give up to about 2.7 m (8.9 ft); FishBase lists a maximum of 3 m (9.8 ft). Newborns are about 45 to 51 cm (18 to 20 in). Animals seen in Djibouti were about 2 m or more.

Weight

Listed at up to about 135 kg (298 lb). Females grow larger than males.

Next to a person

A big adult is about 1.5 times as long as an adult person is tall, and about as heavy as two adults.

What it eats

Bottom-living fish such as croakers, plus crabs, prawns, shellfish and cephalopods. It crushes its food with low, blunt teeth.

Around people

Calm, look only

How it lives

It lives on sandy and muddy seabeds near reefs and wrecks, from about 3 to 90 m. The young develop inside the mother, nourished first by yolk, and litters are 2 to 11 pups, usually about 4, born at about 45 cm. Males mature at about 1.5 to 1.8 m and females above about 1.8 m. FishBase rates its population resilience as very low, with a doubling time of more than 14 years.

Where it goes

Not well tracked. It is described as a strong swimmer that drives itself with its tail like a shark, more active at night and not territorial. In the Gulf of Tadjoura, Djibouti, divers recorded it every November to February over seven seasons between 2015 and 2023, mostly on sand and coral at 20 to 40 m, which suggests animals return to the same area.

We only draw a journey on the map when scientists have tracked it or clearly documented it. For this animal we have not found one yet.

Populations

Critically Endangered (IUCN, 2019). A 2023 study in Djibouti, citing the IUCN, reports declines of more than 80% across its range in the last 45 years. Numbers have fallen substantially in Indonesian waters. It is listed on CITES Appendix II. A regional assessment lists it as Near Threatened in Australia, where turtle excluder devices on trawlers are reported to have helped. In the Gulf of Tadjoura there were 23 sightings over seven seasons (2015 to 2023, with 2020 to 2021 missed), with up to 7 or more at once on 13 January 2017. No global population count was found.

Meet it respectfully

Look only. Never chase, touch, grab or corner a bowmouth guitarfish, and never feed or bait it. It is a strong swimmer with thorns on its head and back. Stay off the seabed so you do not stir up sand or crowd it, and let it choose where to go. It is rare and is seen on a predictable season in some places, but no one can promise a sighting.

Fun fact

Tap the bulb to light it up.

Where you may meet it

Bowmouth guitarfish in the Ocean Atlas

Places we have researched where this animal is recorded. It is never guaranteed, and some places are for watching from the boat only.

FijiTanzaniaW. SaharaCanadaKazakhstanUzbekistanPapua New GuineaIndonesiaArgentinaDem. Rep. CongoSomaliaKenyaSudanChadRussiaFalkland Is.Fr. S. Antarctic LandsTimor-LesteSouth AfricaLesothoUruguayBrazilSurinameFranceZimbabweBotswanaNamibiaSenegalMaliMauritaniaBeninNigerNigeriaCameroonTogoGhanaCôte d'IvoireGuineaGuinea-BissauLiberiaSierra LeoneBurkina FasoCentral African Rep.CongoGabonEq. GuineaZambiaMalawiMozambiqueeSwatiniAngolaBurundiIsraelLebanonMadagascarPalestineGambiaTunisiaAlgeriaJordanUnited Arab EmiratesQatarKuwaitIraqOmanVanuatuCambodiaThailandLaosMyanmarVietnamNorth KoreaSouth KoreaMongoliaIndiaBangladeshBhutanNepalPakistanAfghanistanTajikistanKyrgyzstanTurkmenistanIranSyriaArmeniaUkraineRomaniaBulgariaGreeceTurkeyAlbaniaCroatiaPortugalSpainNew CaledoniaSolomon Is.New ZealandAustraliaSri LankaChinaTaiwanItalyAzerbaijanGeorgiaPhilippinesMalaysiaBruneiSloveniaEritreaJapanParaguayYemenSaudi ArabiaN. CyprusCyprusMoroccoEgyptLibyaEthiopiaDjiboutiSomalilandUgandaRwandaBosnia and Herz.MacedoniaSerbiaMontenegroKosovoS. SudanGulf of Tadjoura and Arta, DjiboutiBaird Bay and Eyre Peninsula, AustraliaBarunguba and Narooma, AustraliaBremer Bay, AustraliaCairns, Port Douglas and the Ribbon Reefs, AustraliaChristmas Island, AustraliaCocos (Keeling) Islands, AustraliaLady Elliot Island, AustraliaLord Howe Island, AustraliaNingaloo, AustraliaRowley Shoals, AustraliaTasman Peninsula and Eaglehawk Neck, AustraliaMaria Island and the east coast, AustraliaAmed, Bali, IndonesiaGili Trawangan, IndonesiaKomodo, IndonesiaGili Air, IndonesiaMaratua and Derawan, IndonesiaRaja Ampat, IndonesiaNusa Penida, IndonesiaLovina, Bali, IndonesiaLakshadweep (Agatti, Bangaram, Kadmat), IndiaNetrani and Murudeshwar, IndiaSwaraj Dweep (Havelock) and Barren Island, IndiaOkinawa, JapanPerhentian Islands, MalaysiaTioman Island, MalaysiaSisters' Islands Marine Park, SingaporeKhao Lak, Similan and Surin Islands, ThailandKoh Lanta and Hin Daeng, ThailandKoh Tao, Thailand

Travel with usComing soonTrusted referralExploringOn pause, story onlyEthics pass

Country colour: pink where we travel, blue where we are exploring or refer, grey for story only.

For partners

Work in ocean travel?

We are always happy to hear from exceptional local operators, accommodation, conservation organisations and destination experts. If your work fits responsible, small-group ocean travel, we would love to learn more.

Partner with Ocean Calling
You might like

Gili Trawangan in 5 days

from CHF 790