Official websites use .gov
A
.gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS
A
lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
This echogram illustrates the ascending and descending phases of the diel vertical migration through the water column. The yellows and reds are indicative of the greatest density of animals.
