It Looks Like An Oil Spill, But Wait Until You See What It Really Is.
A massive school of anchovies was swimming along the shallow waters of La Jolla, California. If you ever see this happening, don’t get near it. The fish are harmless, but they attract sharks and you don’t want to be in their way when they start feeding. Watch for the shark at 0:35 and again at 2:00.
Wow! I would run out of the water so fast!
Source: Scripps Oceanography