Risso's dolphin

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Related to Risso's dolphins: Bottlenose dolphins

Ris·so's dolphin

A marine mammal (Grampus griseus) having a bulbous head, a tall curved dorsal fin, and a gray body with white streaks or scars. Also called grampus.

[After Antoine Risso (1777-1845), French naturalist born in Nice.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Risso's dolphins were encountered year-round in shallow water, with abundance estimates of 2546 individuals (CV=0.36) for the winter-spring period and of 279 individuals (CV=0.55) for the summer-fall period.
Tubbataha is a haven for at least five species of dolphins: Gray's spinner dolphins (Stenella longirostris longirostris), pantropical spotted dolphins (Stenella attenuata ), common bottlenose dolphins (Tursiops truncatus), Fraser's dolphins (Lagenodelphis hosei) and Risso's dolphins (Grampus griseus).
RISSO'S dolphins are now more commonly spotted off the west Wales coast than anywhere else in the UK.
The Scottish Government said the proposals are a world first and would protect Risso's dolphins and other marine life.
Commercial fishing gear, such as gill nets that entangle the endangered North Atlantic right whale (Eubalaena glacialis; hereafter 'right whale') (Kraus et al., 2005) and the common bottlenose dolphin (Tursiops truncatus; hereafter 'bottlenose dolphin') in NC waters (Byrd et al., 2008), and longlines that entangle pilot whales (Globicephala spp.) and Risso's dolphins (Grampus griseus) (Garrison, 2007) pose risks for marine mammals.
The cetaceans found more often in inter-specific groups were offshore bottlenose dolphins associated with short-beaked and long-beaked common dolphins (44.4% of total mixed sightings, n = 12), followed by mixed groups of bottlenose dolphins and Risso's dolphins (29.6% of total mixed sightings, n = 8) and bottlenose dolphins and gray whales (7.4% of total mixed sightings, n = 2).
Large groups of Risso's dolphins, the UK's largest native dolphin, were also seen using an area of rare horse mussel reef in the Pen Llyn a'r Sarnau Special Area of Conservation.
Orca whales, Risso's dolphins, harbour porpoises and humpback whales have all been seen around the Northern Isles and north coast since a citizen science project began last week.
Natural Resources Wales (NRW) is working with the Whale and Dolphin Conservation who filmed Risso's dolphins off Ynys Enlli (Bardsey Island) as part of a long-term monitoring study.
More than 100 Risso's dolphins live and breed in the waters around Bardsey Island, off the coast of Gwynedd, according to the study led by the Whale and Dolphin Conservation group.