Bubble-net fishing involves a group of whales near the ocean surface rounding up fish or krill inside a circle of bubbles exhaled from their blowholes. As the whales rise toward the surface, they ...

Bubble-net feeding is when a group of whales near the ocean surface rounds up fish or krill inside a circle of bubbles they’ve created by exhaling from their blowholes. (Credit: SWNS) “We have ...

Fish breathe oxygen out of the water, and the oxygen levels here can drop extremely low, especially in late summer. That coincides with the time juvenile suckers appear to just vanish from the lake.