| 
 | 
No calls but orcas nearby
Summary for September 9th, 2019. I15s, I35s, A42s. Todays summary picks up where we left off yesterday evening. We were following the A42s and the I15s as they made their way west in the Strait from the reserve. We had been picking up distant calls on the Robson Bight hydrophone, and at this point the calls had migrated along with the whales to the Cracroft Point hydrophone. Would the groups come up through Blackney Passage? Or would they continue west in Johnstone Strait? It didn’t sound as though the orcas would come any closer as their calls began to fade from “CP” around 10:22pm. Not too long after, at 10:39pm, we could hear some very faint G-clan calls on the Flower Island hydrophone. This seemed to be a bit too quick to have been the same whales. Perhaps it was the I35s waiting to the North for a meet up? They had been seen in the area, but they had managed to skirt the range of our hydrophones for the duration of the day. A short time later, we could hear clear A5 calls on the Flower Island hydrophone as well as some very quiet I15 pings at 11:14pm. The timing of these calls would seem to be correct if the orcas had decided to take Weynton into Blackfish Sound. We didn’t hear them for much longer, as by 11:40pm the last calls were heard by the lab until the late this morning. The early morning shift was quiet, but Karien was able to identify “Guardian” the humpback traveling past in front of the lab. The morning progressed and at 10:41am, Bill Mackay on the Naiad Explorer reported that he was with the I4s and I27s just past Stubbs Island in Weynton Passage. Expecting them to arrive in the Johnstone Strait, we began to listen closely to the Cracroft Point hydrophone. Sure enough, at 10:58am we heard the first faint calls, G clan! By 11:30am we were able to see blows on the Vancouver Island side of the strait, slowly easting near Kaikash Creek. Twenty minutes later, we had a report from Jackie Hildering that the group of orcas consisted of the I15s and I35s and at 11:58am, the Naiad reported that the A42s were at the edge of the Stephensons reef, heading into the Johnstone Strait. We started to hear the A42s at 12:19pm and they appeared to favour the Vancouver Island shore while making their way east. The I15s and I35s had made their way to the tide rips at Cracroft Point shortly after noon, where they stopped to forage amongst several humpbacks, porpoises, and even several whale watching boats. The foraging episode lasted nearly an hour. We watched them on the “CP” camera until 1:16pm before the orcas started to trend towards the east, all spread out. The calls began to get quieter at 1:23pm, but we could still hear all three of the groups on the hydrophones. Shari, at “CP”, said she could see the A42s easting along the Vancouver Island shoreline during this time. At 1:47pm The I15 and I35 group of orcas could still be seen and it looked as if they were making a turn back to the west. We noted that the current was ebbing until 9:30pm, and it seemed likely that the orcas would make a move and ride the current to the North. Sure enough the groups turned west and at 3:23pm Shari provided us with early warning that the orcas were definitely angling into Blackney Passage. We were still hearing I15 calls and few very faint I35 calls and they soon were only audible on the Parson Island hydrophone. We began to scan to the south edge of our view, and at 3:43pm we saw black dorsal fins enter our view from the South. We could identify the I27s in the lead followed not too long after by who we believed to be the I16s and the I65s. The lead orcas made good time with the tide and they were already to Parson Light by 3:48pm. Around this same time we could hear A5 calls on the Robson Bight hydrophone so we knew the A42s were beginning to get closer the reserve. Back at the lab, we watched as several orcas, one being a “sprouter” male, take a quick break from travelling to forage. After a brief delay, the 3 groups continued North and cleared the view of the lab at 4:13pm. As soon as these groups had cleared, the I4s and two others appeared on the South edge of the labs view. They moved very quickly through the pass, and trailing that group was I76. He soon caught up to the others, and they all aimed straight for the north with very little time for pause. Only 7 minutes later, all of the orcas had cleared to the north. Their calls became more and more quiet before going silent at 4:57pm. Back in Johnstone Strait, at 4:41pm, we began to hear very clear A5 calls on our Robson Bight hydrophone. We were able to see A66 clearly on the camera and watched as he and his family continued their journey east. We hoped they had intentions to go to the rubbing beach! We started the clock. If all was in order, within 20 minutes we should start to see fins on the camera! Then, exactly 20 minutes later, we heard faint calls at the Rubbing Beach. We scanned for several minutes before zoning in on the orcas with the camera. At 5:19pm we watched as 3-4 orcas swam along the beach close to shore as they rubbed, making several passes in front of our underwater camera. They were both calling and echolocating while they moved back and forth along the beach. Within 15 minutes the orcas had finished at the rubbing beach and at 5:37pm they made a turn back to the west. Just like clockwork, at 5:54pm we began to hear them again within the bight. They came very close to the hydrophone as they moved through the reserve. Several very loud calls later they were already deeper into the Bight. They foraged there for around 30 minutes and were joined by some playful pacific white-sided dolphins. By 6:32pm the A42s were past the western boundary of the reserve and became quiet at 7:00pm. Our predictions of their moments for the day had been quite good up until this point. We expected some silence while the whales travelled back west, and if all was in order, we would hear them on the Cracroft Point hydrophone shortly. Unfortunately, we are not as good at being orcas as they are! After a very quiet hour, the A42s had slipped away out of our view only to surprise us by surfacing back on the Rubbing Beach cameras! At 8:18pm, in the fading light, we watched another beautiful session at the Rubbing Beach. The orcas remained silent and stayed for several passes, and at 8:30pm they appeared to head to the east…
OrcaLab 09 Sep 2019 23:38:34 PDT |
|