Risso's Dolphin

What is it: 

Risso's dolphin is a large, robust dolphin around 3.5m in length, with a blunt, rounded head, and a slight melon but no beak. It is distinctively greyish in colour (whitening with age), often with numerous white scars on the flanks.

There are two groups of layers included

  1. Statistical approaches to aid identification of Marine Protected Areas for Risso's dolphin. Based on SNH Commissioned Report No. 594, these include
    • Observed adjusted densities of Risso's dolphin; and
    • Modelled persistence of above mean density of Risso's dolphin (summers 1994-2012)
  2. Risso's dolphin effort related sightings displays
    • Annual Hebridean Whale and Dolphin Trust Effort Related Sightings Data (2003-2011)
    • Annual and Monthly distribution and relative abundance (1979-1997)
    • Whale and Dolphin Conservation Effort related sightings data for Risso's dolphin (animals per kilometre) 2010 - 2017
Links to Scotland's Marine Atlas: 
This information page is part of the theme: 

Links and Resources

Map Type Click title for metadata and licence informationsort descending Date of data View Map
NMPi Annual distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 - 1997) (Priority Marine Feature) (SNH WMS) Access this map on NMPi
NMPi Annual Hebridean Whale and Dolphin Trust Effort Related Sightings data for Risso's dolphin (Grampus griseus) (2003 - 2011) (Priority Marine Feature) (SNH WMS) (restricted zoom Access this map on NMPi
NMPi April - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi August - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi December - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi February - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi January - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi July - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi June - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi March - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi May - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi Modelled persistence of above mean density of Risso's dolphin (Grampus griseus) (summers 1994 - 2012) (Priority Marine Feature) (SNH WMS) 1994-01-01 to 2012-12-31 Access this map on NMPi
NMPi November - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi Observed adjusted densities of Risso's dolphin (Grampus griseus) (all seasons 1994 - 2012) (mapped as graduated symbols) (Priority Marine Feature) (SNH WMS) 1994-01-01 to 2012-12-31 Access this map on NMPi
NMPi Observed adjusted densities of Risso's dolphin (Grampus griseus) (all seasons 1994 - 2012) (Priority Marine Feature) (SNH WMS) 1994-01-01 to 2012-12-31 Access this map on NMPi
NMPi October - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi September - Monthly distribution and relative abundance of Risso's dolphin (Grampus griseus) (1979 -1997) (Priority Marine Feature) (SNH WMS) 1979-01-01 to 1997-12-31 Access this map on NMPi
NMPi Whale and Dolphin Conservation Effort related sightings data for Risso's dolphin (Grampus griseus) (animals per kilometre) 2010 -2017 (SNH WMS) Access this map on NMPi