4th grade science story - Washington State
Welcome, scientists! In Washington, Pacific salmon begin in cool streams, grow up in fresh water, travel to the salt water of Puget Sound and the Pacific Ocean, then find their way back to spawn. Scroll the story, meet five species, then play and quiz.
This is one big circle of life. Each stage has a job. Take your time and notice what changes from egg to adult.
Adult salmon dig a nest in stream gravel. That nest is called a redd. Soft orange-pink eggs rest there, safe under cool, clean water.
Eggs hatch into alevin. Each alevin carries a yolk sac like a lunch box. When the yolk is gone, the young fish are called fry. They dart out to find tiny food.
As fry grow, dark bars appear on their sides. Now we call them parr. Later they become smolts. Their bodies change so they can leave freshwater streams for salt water.
In the Pacific Ocean (and nearby waters like Puget Sound), salmon grow into strong adults. Years later, many swim back to Washington rivers and streams to spawn. Then new eggs begin the story again.
Seven kid-friendly steps with pictures. Fresh water first, salt water in the middle, then a freshwater return. Explore each card like a scientist.
1
Egg
Stream redd
2
Alevin
Under gravel
3
Fry
Stream edges
4
Parr
Rivers
5
Smolt
Estuary
6
Adult
Pacific Ocean
7
Spawn
Home river
Follow the photos in order: start in freshwater gravel, grow toward the ocean, then return to Washington rivers to spawn.
1
Fresh water - stream gravel redd
Parent salmon dig a nest called a redd in cool stream gravel. Soft orange-pink eggs rest there, washed by clean, moving water. Memorable fact: one redd can hold hundreds of eggs, like a hidden treasure under the stones!
2
Fresh water - under the gravel
Eggs hatch into alevin. Each one still carries a yolk sac that works like a lunch box. They stay quiet near the stones while they grow. Memorable fact: alevin do not hunt yet - their yolk food keeps them full!
3
Fresh water - stream edges
When the yolk is gone, young fish are called fry. They dart into the stream to find tiny insects and bits of food. Shallow, shady spots help them hide. Memorable fact: fry are small but busy - they practice swimming every day!
4
Fresh water - rivers and creeks
As fry grow, dark vertical bars appear on their sides. Now we call them parr. The bars help them blend with rocks and ripples while they get stronger. Memorable fact: those bars are nature's camouflage paint!
5
Downstream - estuary and coast
Smolts change so their bodies can handle salt water. They travel downstream toward estuaries, where fresh water and ocean water mix, then head for the coast. Memorable fact: a smolt's silver look is a sign it is packing for the ocean trip!
6
Pacific Ocean / Puget Sound coast
In the ocean and nearby coastal waters, salmon grow into strong adults. They feed, travel far, and get big enough for the long swim home. Memorable fact: some Washington salmon roam for years before they return!
7
Back to Washington rivers and streams
Adults navigate home to freshwater streams to spawn. After they dig redds and lay eggs, a new generation begins the circle of life. Memorable fact: many salmon find the same river system where they started as eggs! Classroom tip: keep litter out of storm drains so streams stay cleaner for fish.
Washington waters are home to five famous Pacific salmon. Learn nicknames, size vibes, and one fun ID tip. Tap or click a photo to see it larger.
Nickname: King
Size vibe: the biggest of the five - a true heavyweight traveler. Where they go: big rivers and far into the Pacific Ocean. ID tip: think "king-sized" when you hear Chinook!
Nickname: Silver
Size vibe: medium, strong, and quick. Where they go: streams, rivers, and the ocean; they often stay closer to the coast than Chinook. ID tip: look for a bright silver shine in the ocean, then warmer colors when spawning.
Nickname: Red
Size vibe: medium with a bold color change later. Where they go: many are linked to lakes as well as rivers and the ocean. ID tip: spawning sockeye turn deep red - hard to miss!
Nickname: Humpy
Size vibe: the smallest of Washington's five Pacific salmon. Where they go: often a shorter freshwater stay, then out to the ocean. ID tip: spawning males can grow a humped back - that is why kids say "Humpy."
Nickname: Dog
Size vibe: medium to large with strong spawning looks. Where they go: many coastal streams and nearby ocean waters. ID tip: watch for bold stripes and patterns when chum return to spawn.
Drag with a mouse, or tap a stage and then tap a numbered box. You get feedback right away for each placement. Correct stages turn into pictures!
Goal: place each stage in the correct numbered slot (1 = first). Wrong guesses bounce back to the bank.
Stage bank
Your order (1 = first)
Eighteen questions in the bank - each round shows six. You get feedback right away. Reset draws a fresh set of six. No grades stored - just practice!
Photos are saved locally for classroom use. Credits below name public-domain or clearly free-to-use sources. Do not assume every salmon photo online is free.
Content written for Mrs. Mandeville's 4th-grade class at Orchard Elementary (Richland, WA). Keep learning curious and kind.