So imagine you really like fish, but you don't want to go to the store every time you want some. What if you could have your own fish farm? That's what people do when they practice aquaculture of salmonids.
Salmonids are a kind of fish. They are called that because they are part of a big family of fish that are closely related, like how you have cousins and aunts and uncles. Some common salmonids you might know are salmon and trout.
When people do aquaculture of salmonids, they have a special place called a fish farm. It's like a big swimming pool, but for fish! They keep the salmonids there and take care of them so they can grow big and strong. This is called farming fish.
To help the fish grow, people give them food that is just right for them. It's like you need to eat good food to grow up big and strong too! The fish also need clean water to swim in, and that's why the fish farm has special filters to keep the water clean.
When the fish are big enough, people can catch them to sell, just like how they catch fish in the wild. But the cool thing about fish farming is that it helps make sure we always have enough fish to eat, without hurting the fish in the wild.
So that's what aquaculture of salmonids is! It's like having your own fish farm where you take care of fish so they can grow up to be healthy and delicious.