How do scientists locate schools of fish?

How Do Fish Swim In Schools? Scientists Say It's In Their Genes

It's hard to imagine, but a fish can drown

Why do Fish School?

echosounder – NOAA Teacher at Sea Blog

Scientists find 117 chemicals in Grand Portage fish and lake

New Sonar Technology Reveals City-size Schools of Fish - IEEE Spectrum

Gills Definition, Function & Anatomy - Lesson

NOAA Teacher at Sea Blog – Page 5

Why Do Fish School? BLUE WORLD ACADEMY

As rare fish die in the Florida Keys, scientists are left puzzled

Pollock – NOAA Teacher at Sea Blog