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Northern Bottlenose Whale (Hyperoodon ampullatus)

Status | Species Description | Habitat | Distribution | Population Trends | Threats | Conservation Efforts | Regulatory Overview | Taxonomy | Key Documents | More Info

Status

MMPA - Northern bottlenose whales, like all marine mammals, are protected under the MMPA.
CITES Appendix I - throughout its range

Species Description

Weight:
up to 17,000 pounds (7,500 kg)
Length:
about 32 feet (9.8 m)
Appearance:
large, long, robust body that is dark gray, brownish, or olive with a distinctive bulbous "melon" shaped head
Lifespan:
at least 37 years
Diet:
deep-sea cephalopods (e.g., squid), fish, shrimp, sea cucumbers, and sea stars
Behavior:
found individually or in small social groups averaging between of about 4-10 individuals, occasionally up to 50 animals; dives up to 10-60 minutes, reaching depths of up to 5,000 feet (1,500 m)

Northern bottlenose whales are the largest members of the beaked whale family (Ziphiidae) in the North Atlantic Ocean. As adults, northern bottlenose whales can reach lengths of approximately 32 feet (9.8 m) and weigh up to 17,000 pounds (7,500 kg). Males may be slightly larger than females.

Northern bottlenose whales have a large, long, robust body with a small, triangular, "falcate" "dorsal" fin that is located about two-thirds down their back. Their head has a distinctive bulbous "melon" and a well-defined bottle-shaped beak; however, these characteristics may vary with sex and age. The lighter-colored melon and forehead become steeper and flatter as the whale ages. Adult males have a pair of relatively small, conical yet visible teeth that angle slightly forward, located on the tip of the lower jaw. While at the ocean surface, these cetaceans produce fairly small, bushy blows every 30-40 seconds that are about 3.3 feet (1 m) tall and visible from a significant distance. Their coloration varies from dark gray to brownish to olive, and their skin may appear lightly mottled and covered with scars and/or other markings. The dorsal side is darker than the ventral side, giving it a counter-shading appearance.

Many species of beaked whales (especially those in the genus Mesoplodon) are very difficult to distinguish (even when dead). At sea, they are challenging to observe and identify to the species level due to their cryptic, skittish behavior, a low profile, and a small, inconspicuous blow at the waters surface; therefore, much of the available characterization for beaked whales is to genus level only. Uncertainty regarding species identification of beaked whales often exists because of a lack of easily discernable or distinct physical characteristics.

Northern bottlenose whales are usually found individually or in social groups averaging between 4-10 individuals, but have been occasionally seen in larger groups and loose aggregations of up to 50 animals. Groups may consist of various combinations and/or be segregated depending on age, sex, or life stage. Males are known to be combative with each other, using their large heads to "butt" one another (Jefferson et al.2008).

Regular dives of Northern bottlenose whales range from 10-60 minutes, commonly reaching depths of at least 2,600-5,000 feet (800-1,500 m), but they are likely capable of diving and holding their breath for up to 2 hours. While diving, they feed near the ocean bottom mostly on deep-sea cephalopods (e.g., squid), fish, shrimp, sea cucumbers, and sea stars. Juvenile animals may feed on prey closer to the surface.

Northern bottlenose whales reach sexual maturity between 7-11 years. A sexually mature female will give birth to a single calf every two or more years during the spring or summer (usually between the months of April and August) after a gestation period of about 12 months. Newborn calves are about 10-11.5 feet (3-3.5 m) in length and weigh 660 pounds (300 kg). These whales have an estimated lifespan of at least 37 years.

Habitat

Northern bottlenose whales prefer cold, deep, temperate to sub-arctic oceanic waters usually greater than 6,500 feet (2,000 m). This species is often associated with steep underwater geologic structures such as submarine canyons, seamounts, and continental slopes.

Distribution

Northern bottlenose whales occur throughout the North Atlantic Ocean and range from New England, Canada, Greenland, Iceland, England, and Europe up to Spitzbergen and down to the Azores and northern Africa (Canary Islands). They have been sighted from 30° North to close to the ice edge in the Arctic. Long-term studies of a resident group off of Nova Scotia have been conducted. Strandings of this species have occurred in the Baltic Sea, Bay of Fundy, and Rhode Island. This species is capable of traveling distances of more than 600 miles (1,000 km).

Population Trends

The most recent stock assessment reports with population estimates are available on our website.

Threats

Historically:

Currently:

Regulatory Overview

This species is protected under the Marine Mammal Protection Act of 1972, as amended.

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Cetacea
Family: Ziphiidae
Genus: Hyperoodon
Species: ampullatus

Key Documents

(All documents are in PDF format.)
Title Federal Register Date
Stock Assessment Reports - various

More Information

References

Updated: January 15, 2015