Known Occurrence

Known Occurrences are events that can occur in waves in Salmon Run in Splatoon 2 and Salmon Run Next Wave in Splatoon 3. Mr. Grizz has special dialogue when one begins, as well as during it in some cases. With the exception of Water Level changes, Known Occurrences cannot be experienced by Apprentices unless there is at least one Profreshional in the group. The same Known Occurrence can happen more than once in the same shift.

For a Known Occurrence, the sky in the background will get darker, and Fishing Frenzy (or Frothy Waters in Splatoon 3, depending on the occurrence) will play in place of Deluge Dirge or Frantic Aspic.

Event list
{| class="wikitable" ! rowspan="2" |Event ! rowspan="2" |Description ! rowspan="2" |Warning Cues Before Wave Starts ! colspan="4" |Salmonid Field Guide !What Happens !How to Get Golden Eggs !Advice from Mr. Grizz !Supplementary Information
 * colspan="7" |
 * colspan="7" |

Introduced in Splatoon 2

 * rowspan="2" |Water Levels (high and low tides)
 * During low tide, the water on the map is lowered to its lowest point, revealing a shore. Salmonids and another goal will spawn near the shore.
 * The water-like overlay between waves does not reach the supplied weapon indicator.
 * Low Tide
 * When the tide goes out, a large amount of land that is usually underwater will be exposed.
 * Salmonid warriors use this land as a staging ground from which to launch coordinated attacks.
 * During low tide, the egg basket will be near this newly exposed land.
 * Defeat Boss Salmonids.
 * During low tide, you gotta get together and move, move, move down to that exposed land, kid!
 * rowspan="2" |
 * The sudden and irregular changes in the water levels are a rare phenomenon found only in this area.
 * The cause is as yet unknown, and is the subject of much research throughout the academic world.
 * During high tide, the water on the map rises, hiding a portion of the ground in water. Salmonids will spawn closer to the center of the map.
 * The water-like overlay between waves reaches the top of the supplied weapon indicator.
 * High Tide
 * When high tide is in, there'll be much less land available.
 * The egg basket will be in its normal place.
 * Defeat Boss Salmonids.
 * During high tide—I don't care how hard it is—you gotta survive against those Salmonids!
 * Rush
 * Salmonids rush at the player who has Glowflies above their head. The only Boss Salmonid that spawns is the Goldie, and the only Lesser Salmonid is the Chum. (Snatchers can still spawn.) Chums have only 50 health in this mode.
 * No warning cues.
 * Large groups of ferocious Salmonids appear and carry out rush attacks at furious speed.
 * These crazed Salmonids gather in response to the appearance of Glowflies.
 * Take out the Goldie hidden in the school of Salmonids.
 * Stand your ground with your allies and concentrate your fire on the incoming Salmonids!
 * Watch out for the Glowflies—if they buzz around you, a concentrated attack won't be far behind.
 * It is claimed that the Salmonids' increased aggression is tied somehow to gravitational shifts due to the planet's celestial course, but there is still much that is unclear.
 * It is said that in pre-medieval times, before effective defense measures such as long-range ink attacks were available, many cities fell before the rage of the Salmonid rush.
 * Fog
 * Fog will cover the arena, making it more difficult for players to see. There is a chance that Goldies may spawn.
 * The fog will fade in during the last three seconds before the wave begins.
 * The area is covered in a dense fog, drastically reducing visibility.
 * Enemies will take advantage of the fog and attack from all directions.
 * Defeat Boss Salmonids.
 * The extremely rare Goldies may appear in foggy conditions.
 * Try to maintain contact with your teammates at all times while in the fog.
 * Being alone in the fog is extremely dangerous.
 * Goldies are extremely rare Salmonids—only one of every 10,000 hatchlings is a Goldie.
 * They live longer than and possess far superior intelligence to normal Salmonid specimens.
 * The Griller
 * All salmonids are replaced with Grillers and Smallfry. Smallfry spawn in small groups, while Grillers show up one at a time. Later in the wave, multiple Grillers may appear at a time.
 * No warning cues.
 * Armored vehicles called Grillers spawn one after the other. Grillers lock their sights on to a target and will pursue it relentlessly.
 * Smallfry are known for hitching a ride on the Griller and interfering with its targeting.
 * Attack the weak spot on the back of the Griller to stun it.
 * Stunning Grillers will reveal further weak points. Attacking these weak points is the key to taking down Grillers and getting Golden Eggs.
 * If the Griller has you in its sights, you're better off running away and letting your friends handle it.
 * Operating costs for a single Griller would be enough to deploy 100 regular Salmonid fighters.
 * Cohock Charge
 * The only Lesser Salmonid that spawns is the Cohock. Ink Cannons will appear to help the players defeat the horde. Only confirmed to occur alongside shoreline waves.
 * The cannons appear three seconds before the wave begins.
 * Cohocks will attack in large numbers from exposed sandbanks.
 * Mr. Grizz will deploy a cannon for you to use in dealing with these foes.
 * Defeat Boss Salmonids.
 * Use the cannon well to clear the way for your coworkers!
 * Apparently there are special rooms in the Salmonid barracks set aside for large numbers of Cohocks to gather and practice.
 * Goldie Seeking
 * Salmonids will not spawn from the shoreline, and the only Boss Salmonid that appears is the Goldie. There will be gushers scattered throughout the map. Attacking gushers will release lesser salmonids or the Goldie. The more light coming from the gusher and the higher the spout of ink, the closer the player is to finding the gusher with the Goldie.
 * The Gusher valves will rise from the Gushers three seconds before the wave begins.
 * Large numbers of Gushers will appear in the area.
 * A Goldie will be hiding in one of the Gushers.
 * You can shoot the Gusher to make it erupt, but chances are a regular salmonid will pop out instead of a Goldie.
 * The Goldie lurking in one of the Gushers will drop loads of Golden Eggs when hit with ink.
 * Spread out, and find that Goldie FAST.
 * When you find the Goldie, call your buddies over and let loose with all your firepower!
 * The Gushers emit light when you hit them--the brighter the light, the closer you are to that glorious Goldie.
 * Salmonids obtained the technology to create Gushers through trade with Octarians.
 * The Goldie loses scales when hit, so it's able to move faster the more you damage it!
 * The Mothership
 * One Mothership will spawn. Chinooks carry crates of Lesser Salmonids from the Mothership to the battleground. The Mothership will try to take eggs from the egg basket twice.
 * The Mothership emerges from the water and rises high into the air three seconds before the wave begins.
 * New troops are brought to the battleground from the Mothership.
 * A large number of Chinooks will bring containers of lesser Salmonids from the Mothership to join the fray.
 * Periodically, the Mothership will draw close to the egg basket and try to suck up and reclaim any Golden Eggs inside.
 * Shoot the containers carried by the Chinooks to make them explode.
 * If you manage to blow up the Chinooks as well, they will drop Golden Eggs.
 * Split up to take out the Chinooks.
 * If the Mothership comes to take back the Golden Eggs, everyone should focus on pushing it back!
 * The Mothership is a vital cog in the Salmonid distribution chain.
 * Deploying the Mothership is said to be the last resort of the Salmonid army. When it is dispatched, all troops stationed nearby gather together to see it off.
 * colspan="7" |
 * Apparently there are special rooms in the Salmonid barracks set aside for large numbers of Cohocks to gather and practice.
 * Goldie Seeking
 * Salmonids will not spawn from the shoreline, and the only Boss Salmonid that appears is the Goldie. There will be gushers scattered throughout the map. Attacking gushers will release lesser salmonids or the Goldie. The more light coming from the gusher and the higher the spout of ink, the closer the player is to finding the gusher with the Goldie.
 * The Gusher valves will rise from the Gushers three seconds before the wave begins.
 * Large numbers of Gushers will appear in the area.
 * A Goldie will be hiding in one of the Gushers.
 * You can shoot the Gusher to make it erupt, but chances are a regular salmonid will pop out instead of a Goldie.
 * The Goldie lurking in one of the Gushers will drop loads of Golden Eggs when hit with ink.
 * Spread out, and find that Goldie FAST.
 * When you find the Goldie, call your buddies over and let loose with all your firepower!
 * The Gushers emit light when you hit them--the brighter the light, the closer you are to that glorious Goldie.
 * Salmonids obtained the technology to create Gushers through trade with Octarians.
 * The Goldie loses scales when hit, so it's able to move faster the more you damage it!
 * The Mothership
 * One Mothership will spawn. Chinooks carry crates of Lesser Salmonids from the Mothership to the battleground. The Mothership will try to take eggs from the egg basket twice.
 * The Mothership emerges from the water and rises high into the air three seconds before the wave begins.
 * New troops are brought to the battleground from the Mothership.
 * A large number of Chinooks will bring containers of lesser Salmonids from the Mothership to join the fray.
 * Periodically, the Mothership will draw close to the egg basket and try to suck up and reclaim any Golden Eggs inside.
 * Shoot the containers carried by the Chinooks to make them explode.
 * If you manage to blow up the Chinooks as well, they will drop Golden Eggs.
 * Split up to take out the Chinooks.
 * If the Mothership comes to take back the Golden Eggs, everyone should focus on pushing it back!
 * The Mothership is a vital cog in the Salmonid distribution chain.
 * Deploying the Mothership is said to be the last resort of the Salmonid army. When it is dispatched, all troops stationed nearby gather together to see it off.
 * colspan="7" |
 * Shoot the containers carried by the Chinooks to make them explode.
 * If you manage to blow up the Chinooks as well, they will drop Golden Eggs.
 * Split up to take out the Chinooks.
 * If the Mothership comes to take back the Golden Eggs, everyone should focus on pushing it back!
 * The Mothership is a vital cog in the Salmonid distribution chain.
 * Deploying the Mothership is said to be the last resort of the Salmonid army. When it is dispatched, all troops stationed nearby gather together to see it off.
 * colspan="7" |
 * The Mothership is a vital cog in the Salmonid distribution chain.
 * Deploying the Mothership is said to be the last resort of the Salmonid army. When it is dispatched, all troops stationed nearby gather together to see it off.
 * colspan="7" |
 * colspan="7" |

Introduced in Splatoon 3

 * Mudmouth Eruptions
 * Mudmouths will emerge from gusher holes and spawn Salmonids. Golden Mudmouths can appear which spawn Cohocks and drop more Golden Eggs.
 * No warning cues.
 * A Mudmouth will erupt out of the hole left by a gusher and open its huge mouth.
 * Lesser Salmonids will start jumping out of the Mudmouth's mouth, one after another after another...
 * Throw a bomb into the Mudmouth's mouth. When the bomb explodes, it'll cough up a Golden Egg.
 * If you throw in enough bombs, the Mudmouth will explode and drop even more Golden Eggs!
 * Sometimes you'll see one covered in golden goop(a Golden Mudmouth). Defeat it, and it'll leave behind LOTS of Golden Eggs.
 * Search for the Mudmouth by tracking where the Lesser Salmonids are coming from.
 * Mudmouths multiply as time passes, so splat 'em fast!
 * Long ago, the Mudmouth was thought to be a spirit who haunted the depths of the Splatlands seas.
 * Now, thanks to the courage and quick thinking of Splatsville youths who thought to start throwing bombs into their mouths, we know they're just Salmonids who got stuck in a pipe and coated in mud.
 * Giant Tornado
 * A tornado will appear by the shore, and Salmonids will be flung towards land. Boxes full of Golden Eggs will fall somewhere on the shoreline, far away from the egg basket. Always a low-tide wave, but uses the normal basket. No Snatchers spawn.
 * Thunder crashes. A large rock lands on the low-tide basket spawn five seconds before the wave starts. The titular tornado fades in three seconds before the wave starts.
 * The ground will dry up, and a gigantic tornado will whirl to life by the shore.
 * Anything in the sea, including Salmonids, will be sucked up by the tornado and flung toward land.
 * Boxes packed full of Golden Eggs will fall somewhere on dry land.
 * Break open the boxes to release a large number of Golden Eggs.
 * Since the eggs may land far away from the basket, coordinate with your coworkers and use the Egg Throw.
 * Dodge any Salmonids that come flying toward you, or splat them as you transport the eggs.
 * There's no way to predict when a giant tornado might appear. It will fling all kinds of things out from the ocean, which usually results in a great number of Salmonid casualties.
 * Flying debris will be present, and accidents are bound to happen. If you become unable to use the egg basket on dry land, a single egg delivered to the basket will be counted as two.
 * }
 * Boxes packed full of Golden Eggs will fall somewhere on dry land.
 * Break open the boxes to release a large number of Golden Eggs.
 * Since the eggs may land far away from the basket, coordinate with your coworkers and use the Egg Throw.
 * Dodge any Salmonids that come flying toward you, or splat them as you transport the eggs.
 * There's no way to predict when a giant tornado might appear. It will fling all kinds of things out from the ocean, which usually results in a great number of Salmonid casualties.
 * Flying debris will be present, and accidents are bound to happen. If you become unable to use the egg basket on dry land, a single egg delivered to the basket will be counted as two.
 * }
 * There's no way to predict when a giant tornado might appear. It will fling all kinds of things out from the ocean, which usually results in a great number of Salmonid casualties.
 * Flying debris will be present, and accidents are bound to happen. If you become unable to use the egg basket on dry land, a single egg delivered to the basket will be counted as two.
 * }