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Tursiops truncatus

(Indian Ocean Bottlenose Dolphin)

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Aleut:

Nezarnak

Common Names in Czech:

Delfín Skákavý

Common Names in Danish:

Øresvin

Common Names in Dutch:

Tuimelaar

Common Names in English:

Atlantic Bottle-Nosed Dolphin, Atlantic Bottlenose Dolphin, Bottle-Nose Dolphin, Bottle-Nosed Dolphin, Bottlenose Dolphin, Bottlenosed Dolphin, Common Bottlenose Dolphin, Indian Ocean Bottlenose Dolphin, Offshore Bottlenose Dolphin

Common Names in French:

Dauphin Nesarnak, Grand Dauphin, Grand Souffler, Oudre, Souffleur, Tursion, Tursiops

Common Names in German:

Großer Tümmler, Grosser Tümmleer, Hochcöplige Tümmler, Oresvin Tantöje, Tümmler

Common Names in Italian:

Delfino Maggiore, Tursione, Tursiope

Common Names in Japanese:

Hando Iruka

Common Names in Latvian:

Lielaa-Iuras-Tsuuka

Common Names in Norwegian:

Tandthöije, Tumler

Common Names in Portuguese:

Boto, Bouto, Peixe-Boto, Roaz Corvineiro

Common Names in Russian:

Afalina, Chernvi Delfin, Ofalina

Common Names in Spanish:

Delfín Tonina, Delfín Tonina, Mular, Pez Mular, Tursión

Common Names in Swedish:

Oresvin

Description

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Family Delphinidae

The family Delphinidae has been called a 'taxonomic trash basket', because many small to medium-sized odontocetes of various forms have been lumped together in this group for centuries. Consequentely, the so-called delphinids are diverse in form. They range in size from 1 to 1.88 m dolphins of the genera Sotalia and Cephalorhynchus, to the killer whale , in which males can reach lengths of at least 9.8 m. However, most delphinids share the following characteristics: a marine habitat , a noticeable beak, conical teeth, and a large falcate dorsal fin set near the middle of the back. There are exceptions to everyone of these rules , except the presence of basically conical teeth.

Physical Description

Species Tursiops truncatus

Made famous by the television show Flipper, the Bottlenose Dolphin is a large, robust animal with a slightly hooked broad dorsal fin. Size and some physical characteristics vary according to the distribution of each individual. In smaller forms, the well-known bottle-shaped beak is shorter and slender. It broadens as the body size increases. In some populations the melon is more rounded . Body colour also varies; the dorsal cape ranges from dark blue to brown-grey, fading to a pale grey along the flanks. The ventral surface is white-pink, and the tip of the snout is normally white. Tail flukes and the flippers' edges are grey-black. Dark lines from melon to eye and eye to flipper can also be seen. Some populations are spotted, or a dark grey-black. The Bottlenose Dolphin measures between 1.9m and 4m, weighing 90-650kg.

Recognition at sea : The Bottlenose Dolphin cannot really be confused with other species - for instance, the spotted variety is more bulky in appearance than other mottled species, such as the Pantropical and Atlantic Spotted Dolphins . The broad dorsal cape and shorter snout should discern this animal from the Rough-Toothed Dolphin, which has a more cone-shaped head . In coastal waters , the size and shape of the dorsal fin should be enough to distinguish between the Bottlenose Dolphin and other local species, such as the Tuxuci, which has a more triangular fin .

Size/Age/Growth

Size: Adults from 1.9 to 3.8m, weighing up to 650kg. There is tremendous variation between populations, as different groups, known as ecotypes, are adapted to the different conditions in which they live.

Longevity : At least 30 years (approximately).

Habitat

Coastal and Oceanic species. Populations generally occur in water in less than 30 miles from shore . Found in open coasts with strong surf to sheltered bays and waterways , lagoons , large estuaries and the lower reaches of rivers .

Typically found in the intertidal zone at the water's edge at a mean distance from sea level of -337 meters (-1,104 feet).[1]

Ecology: List of Habitats : 9.1 Marine Neritic - Pelagic 9.10 Marine Neritic - Estuaries 10.1 Marine Oceanic - Epipelagic (0-200m)

Biology

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Diet

Feeding behaviour is extremely varied, depending on what is available. They may co-operate to forage on large schools of fish, or chase individual fish inshore. They have also been seen feeding behind trawlers and other fishing boats . This adaptability in feeding has undoubtedly contributed to their success, and enabled them to range so extensively.

Reproduction

Life Span: 30+ years. Gestation period : 12 months. Peak seasons for mating: May and June. Calving interval: two to three years. Nursing lasts: calves suckle for up to 18 months. Sexual maturity begins at 9-10 for males and 10-13 years for females.

Behavior

Bottlenose Dolphins live in fairly open groups, generally containing no more than 20 animals, but large herds have been seen offshore. They commonly associate with other dolphin species, and sometimes they may interbreed.

Taxonomy

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Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 08-Jun-2002

Similar Species

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Members of the genus Tursiops

There are approximately 24 species in this genus:

T. aduncus (Indian Ocean Bottlenose Dolphin) · T. catalania · T. cymodice · T. dawsoni · T. fergusoni · T. gephyreus · T. gilli · T. gillii · T. maugeanus · T. nesarnack · T. nesarnack catalania · T. nuuanu · T. oligodon · T. osennae · T. parvimanus · T. species · T. truncatus (Indian Ocean Bottlenose Dolphin) · T. truncatus aduncus (Southern Bottle-Nosed Dolphin) · T. truncatus gilli · T. truncatus gillii · T. truncatus ponticus (Black Sea Bottlenose Dolphin) · T. truncatus truncatus (Indian Ocean Bottlenose Dolphin) · T. tursio · T. x

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 18, 2007:

Identifiers

Footnotes

  1. Standard Deviation = 911.890 based on 11,489 observations. Terrestrial altitude and ocean depth information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2009-05-12