Known Occurrence

Special Waves are events in Splatoon 2 ' s Salmon Run mode. A wave is indicated to be special if Mr. Grizz has alternative dialog before the wave begins.

List of special waves

 * Shoreline wave &mdash; The water on the map is lowered to its lowest point, revealing a shore. Salmonids and (typically) another goal will spawn near the shore.
 * High tide &mdash; The water on the map rises, hiding a portion of the ground in water. Salmonids will spawn closer to the center of the map.
 * Cohock wave &mdash; All non-boss salmonids are replaced with Cohocks. Ink Cannons will appear to help the players defeat the horde. Only confirmed to occur alongside shoreline waves.
 * Griller wave &mdash; 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.
 * Mothership wave &mdash; All salmonids are replaced with Motherships. One mothership will spawn at a time.
 * Fog wave &mdash; Fog will cover the arena, making it more difficult for players to see.
 * Golden One wave &mdash; Salmonids won't spawn from the shoreline, and Boss Salmonids won't appear. There will be gushers scattered throughout the map. Attacking gushers will release lesser salmonids or the Golden One.