Imagine you live in a beautiful apartment, and someone suddenly floods it with bleach and motor oil. That’s what pollution does to rivers and lakes for fish, frogs, and turtles. They breathe that water through their gills or skin, and it literally burns or poisons them.
I remember visiting a local creek as a kid, full of minnows and crawdads. Twenty years later, a pipe dumped runoff from a nearby parking lot into it. Now? It’s mostly green slime and the occasional, sad-looking catfish. That slime is called an algal bloom, and it sucks all the oxygen out of the water.
Without oxygen, everything underwater suffocates. It’s like putting a plastic bag over your head—just not a happy ending.
When the Water Gets Thirsty for Air
Here’s a weird science fact: clean water needs to breathe too. Oxygen from the air dissolves into rivers, which fish gulp through their gills. But when pollution—like fertilizer from lawns or farm fields—washes in, it feeds tiny algae like candy.
Those algae go on a party spree, but then they die and rot. And rotting stuff uses up all the leftover oxygen. Poof—no oxygen, no life. This is called a “dead zone,” and there are hundreds of them in oceans. It’s basically a underwater desert.
