By Maude-Émilie Bourque

August 28, 2019: it’s my last day as a volunteer research assistant for the GREMM this season. For three months now, I have been watching and photographing the large rorquals that visit the Saguenay-St. Lawrence Marine Park. Incredible sightings of humpback, minke and fin whales have been part of my day-to-day life, not to mention a beautiful moment with a blue whale. What a privilege to be around these giants!

The morning agenda consists of a delightful cruise with calm seas and minimum cloud cover. After a 7 a.m. departure, we’re alone on the water in search of spouts. We’re fortunate in that, not long after setting sail, we spot two sprays of condensation in the distance: whale blows. Shortly after arriving to the site, I identify two humpbacks. I’m ready to snap a few pictures of their flanks and tails for ID purposes. Unpredictable creatures as they are, they treated us to another display of behaviour, one that I hadn’t yet had the chance to observe. Our two graceful beasts are at the surface and there is obviously an abundance of food in the sector. They cruise around lazily and open their mouths, revealing the baleen they use to engulf a cloud of what we believe to be krill.

Even if they sometimes take shallow dives, we can follow the whales with our eyes thanks to the bubbles they leave in their wake. These bubble paths are not as well structured as those I had seen in videos describing bubble-net feeding. This hunting technique entails encircling their prey while releasing streams of air bubbles underwater. The prey are then trapped so that the whale or whales can take large gulps without the food dispersing too much. This allows the cetaceans to feed more efficiently. Perhaps our two individuals were using this technique? Quite plausible, considering that they were constantly resurfacing with their mouths agape and their throats distended.

In moments of intense activity, it is not uncommon to see other behaviours such as the slapping of pectoral and caudal fins (tail). As a biology student with a particular interest in marine mammals, witnessing these behaviours up close has heightened my curiosity and my passion for these beautiful animals that still have so much to teach us.

Maude-Émilie Bourque joined the GREMM team this year. As part of the large rorquals photographic census program of the Saguenay-St. Lawrence marine park’s, she collects photos and data on board excursion boats. She also shares this information with the Whales Online team.
Field Notes - 9/9/2019

Équipe du GREMM

Led by scientific director Robert Michaud, the research team of the Group for Research and Education on Marine Mammals (GREMM) studies St. Lawrence beluga whales and large rorquals (humpback, blue and fin whales) at sea. The Bleuvet and the BpJAM leave the port of Tadoussac every morning to gather valuable information on the life of the whales of the St. Lawrence Estuary.

Recommended articles

2021 Season Raises Questions

By René Roy For several years now, I’ve been plying the waters of the St. Lawrence in order to observe…

|Field Notes 13/12/2021

One Final Outing…

By Renaud Pintiaux, naturalist and wildlife photographer   The whale-watching season in the waters between Tadoussac and Les Escoumins ended…

|Field Notes 3/12/2021

With the Belugas… Collecting Biopsies

By Laura Zeppetelli This fall, I had the opportunity to leave my office in downtown Montréal to board the Bleuvet…

|Field Notes 9/11/2021