With the Belugas: Week of July 3, 2017
Identifying Individual Belugas
Belugas are not one of the most easily recognizable whale species. They do not systematically show their tail when they dive like humpbacks, do not show pigment patterns like blue whales, and they completely lack a dorsal fin.
In lieu of a dorsal fin, we find in belugas what is called a dorsal ridge, which contains valuable visual information to differentiate individuals. However, animals with markings in the dorsal ridge are not the easiest to recognize, especially if these gashes are small. On the other hand, some animals will have visible markings on their flanks such as scars, holes, spots, “brush strokes”, etc., that make them much easier to identify.
During the day of July 7, while amongst a herd at the mouth of the Saguenay Fjord, we observed several animals showing all these marking types, the shape of which is sometimes rather eccentric and whose origin is a mystery. For instance, look at the series of round spots on the flank of DL2503, or the scratches on the side of Dorothy that resemble scribbles made by a child. During this encounter, we were able to recognize Miss Frontenac and DL0169 thanks to their respective scars and Pure-Laine thanks to the small “brush stroke” on her left flank.
Below is the complete list of animals identified this week by our sharp-eyed lab technicians. The majority of identifications take place at the office when comparing photos. At sea, the brief glimpses offered by the animals do not always allow individuals to be recognized.
Identifications of the weekBlanchon – Adopted by Sainte-Justine hospital employees and students from Saint-Sacrement’s school in 1993Dorothy – Adopted by Adelaide Gomer and Mathijs and Anneke Wittink in 2016Miss Frontenac – Adopted by Fairmont Le Château Frontenac in 2008Pure Laine – Adopted by Cynthia Fish in 2014
and Dl1500, Dl1903, Dl2181 (last observation in 2007), Dl2503 (last observation in 2006), Dl1328, Dl473 et Dl1772 (last observation in 2011).
The complete list of identified belugas requires meticulous efforts to match individuals, which will be undertaken once the field season has come to a close.
Property of the GREMM and the St. Lawrence National Institute of Ecotoxicology, the Bleuvet is a research boat dedicated to the research program on St. Lawrence belugas. Managed by GREMM scientific director Robert Michaud, the Bleuvet crew is composed of Michel Moisan, Tim Perrero and Albert Michaud.