Salmonid

The Salmonids are a race of fish creatures and the main antagonists and enemies of the Salmon Run mode in Splatoon 2 and Splatoon 3. Their main ink color is dark green in Splatoon 2 and dark teal in Splatoon 3.

Biology and culture
Boss Salmonids and Lesser Salmonids constitute the same species. Smallfry are the youngest Salmonids, and what appearance they'll reach in maturity is determined by the environment they are raised in. Those who are raised in a harsher environment become Boss Salmonids. Steelheads and Maws have bigger bodies, while Scrappers and Steel Eels have higher intelligence.

Salmonids regularly return in large numbers from their habitat to where they spawned in order to mature, a behavior called a Salmon Run. For them, music signifies the start of such runs, and they play it to raise morale. The best performers from a tribe form a band. ω-3 is a notable all-Salmonid band whose music plays throughout runs. Additionally, the Smallfry comprising Fish Sticks sing a war chant during runs.

Most Salmonids use cooking utensils as weapons during Salmon Runs: Chums and Cohocks use frying pans, Smallfry use spoons, Grillers use charcoal grills, Stingers use a stack of cooking pots, Flyfish and Chinooks use beverage coolers, and Slammin' Lids use soup ladles. Salmonids are an honorable clan; fighting for their clan's pride is seen as equally precious as their values. They take care of keeping their weapon in great shape. Their frying pans, as well as other weapons they wield, are passed down from generation to generation.

In a developer interview, it was revealed that this is due to the Salmonids trying to make themselves look “tasty”. It’s explained that the Salmonids aren’t afraid of dying and regard their death to be a cycle of life and think of all life being part of this cycle. Grillers are said to be the ultimate way of doing so by the Salmonids becoming the contents of the Griller. When the Salmonids fight to death, they feel a sense of unity with themselves and the world. When they are eaten by other creatures, they see their death as a way of being one with the world.

In rare cases where young Smallfry are separated from their school, their appetites increase dramatically as they attempt to return to their original school's waters.

There are floating sculptures based off of cooking utensils in the background of Salmon Run stages, some of which also feature food such as vegetables. These are likely built by the Salmonids, symbolizing their goal of being delicious to eat.

In 's single-player mode Return of the Mammalians the player character Agent 3 is accompanied by a friendly Smallfry nicknamed li'l buddy that has seemingly traveled alongside them for some unspecified time. Li'l buddy can be thrown as a unique Sub weapon in overworld areas as well as certain missions, during which it is eager to be fed Power Eggs. It responds to certain Signals and is capable of eating Fuzzy Ooze after having been fed large amounts of Power Eggs. Sunken Scroll 8 suggests this Smallfry was separated from its group during a run, lending to its increased appetite, and it travels alongside Agent 3 in order to return to its original home.

Lesser Salmonids

 * S3 Chum icon.png Chum
 * S3 Smallfry icon.png Smallfry
 * S3 Cohock icon.png Cohock
 * Snatcher
 * S3 Chinook icon.png Chinook

Normal Bosses

 * S3 Steelhead icon.png Steelhead
 * S3 Flyfish icon.png Flyfish
 * S3 Steel Eel icon.png Steel Eel
 * S3 Maws icon.png Maws
 * S3 Stinger icon.png Stinger
 * S3 Drizzler icon.png Drizzler
 * S3 Scrapper icon.png Scrapper
 * S3 Fish Stick icon.png Fish Stick
 * S3 Flipper-Flopper icon.png Flipper-Flopper
 * S3 Big Shot icon.png Big Shot
 * S3 Slammin Lid icon.png Slammin' Lid

Event-specific Bosses

 * S3 Griller icon.png Griller
 * S3 Goldie icon.png Goldie
 * Mothership
 * S3 Mudmouth icon.png Mudmouth

King Salmonids

 * S3 Cohozuna icon.png Cohozuna

Trivia

 * The Salmonids' hair looks like a Spartan Helmet. The Spartans were a warrior city-state that valued dying for Sparta in combat.
 * The Salmonids have a trade agreement with the Octarians, where the Salmonids provide Power Eggs used as energy sources in exchange for Octarian weapons and machinery. In The Art of Splatoon 2, it is stated that Salmonids do not trade Golden Eggs, as they are too valuable.
 * The Salmonids which use a frying pan as their weapon, consisting of the Chum, Cohock and Goldie, all have two variations of the frying pan. One variant of the frying pan has an emblem resembling a Salmonid, a metal handle, a smoother shape and circular rings on the pan. The other variant lacks these features while having a wooden handle.
 * Lesser Salmonids may make upward jumps of unlimited heights to splat players staying on walls for too long.
 * The Salmonids' appearance resembles that of a salmon when it is in its spawning phase, which differs from ocean phase, where it turns more vibrant red, adopting brown and grey colors instead of the silvery color, and has a more elongated jaw that hooks downwards with bigger teeth. Some species also get hunched backs.
 * The Salmonids willingness to die may be based on how salmon partaking the salmon run die after spawning. The dying salmon play an important role in providing nutrients to life surrounding it, which may also be what the Salmonids' belief of "becoming one with the world" is based on.
 * Smallfry respawns after being splatted in Return of the Mammalians with the same audio cue as Inklings and Octolings' respawning, but whether or not the Salmonids encountered during Salmon Run are also capable of doing so is unclear.