Lunge feeding whales on the humpback hiway in the Johnstone Strait. Lunge feeding is a technique used by humpback whales to engulf large quantities of concentrated fish. This solo technique is completed by diving down and slowly blowing bubbles while circling a school of fish. As the panic sets in, the fish group tighter together allowing the whale to push them closer to the surface and gulping up a mouthful. Using their tongues to push against their balleen, a protein similar to your hair and fingernails, the humpbacks then filter the water out of their mouth.