Hunters on the Prowl!

A few weeks ago, we observed a beluga whale spitting on the water surface to hunt herring. This week we witnessed our white whales in the midst of yet another hunting foray.

In the fall, we often see large gatherings of belugas between Buoys S7-S8 and Pointe Rouge that move as if there were a treadmill carrying them under water to Pointe Rouge, while at the surface they actively swim toward the buoys of the Saguenay.

On one late afternoon outing, we find ourselves amongst one of these herds that make our heads spin. There is no rhyme or reason to the animals’ movement pattern and we struggle to properly position ourselves for photo-ID work. Patience is a must!

The group we are targeting completes its sequence of breathing and diving, but we can still make out their silhouettes just below the surface of the water. We can see that they are swimming very fast and constantly changing direction. Suddenly, we spot a small mass of water that quivers and moves. Something is happening just below the surface! Our belugas are behind this activity, but indirectly: it’s fish that are wriggling down there! We move closer for a better view. Michel arrives to snap a few photos of the scene that has just unfolded before our eyes. The show lasted for just a minute before the water surface returned to normal.

Back on land, we carefully examine the photos on the computer screen. Hard to say for sure, but one photograph in particular gives us good reason to suspect that these were striped bass. In one of the shots, we can even make out the silhouettes of four of these fish.

Last year, for the first time in his long career, Michel witnessed a scene of striped bass being hunted. With the return of this species to St. Lawrence waters, it is possible that striped bass are being consumed by belugas, which have a rather diverse diet.

Field Notes - 4/10/2017

Équipe du GREMM

Dirigée par Robert Michaud, directeur scientifique, l’équipe de recherche du Groupe de recherche et d’éducation sur les mammifères marins (GREMM) étudie en mer les bélugas du Saint-Laurent et les grands rorquals (rorqual à bosse, rorqual bleu et rorqual commun). Le Bleuvet et le BpJAM quittent chaque matin le port de Tadoussac pour récolter de précieuses informations sur la vie des baleines de l’estuaire du Saint-Laurent.

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