Humpback Whales Bubble Net Feeding in Work Channel in Northern BC. When the whales rise up trapping the fish enclosed by their bubble net, it not only feeds the whales but the gulls that look for stray fish. When the Whales are circling the fish forming bubbles they let out a loud low call that the gulls can hear so when you see the gulls fly to a spot on the ocean you can expect a circle of whales to rise up from the depths. Such an exciting wildlife encounter.