Ω-3

"This is ω-3 (Omega-3), the band that plays all the music you hear in Salmon Run. This is an unusual combination of cello, timpani and DJ, and many part-time workers find themselves prisoners of the irregular 7/8 beat. We are meant to be researching squids, but we have also found an interest in salmon..."

- Japanese Splatoon Twitter

ω-3 (Omega-3) is a band in and. They are not physically seen in-game, but are credited in Squid Beatz 2, Splatune 2, and Splatoon 2 Live in Makuhari.

Description
ω-3's music, which plays in Salmon Run, consists of a cello, a timpani, and synthesizers, sound effects, and other percussion instruments made by the DJ. Their music is usually very frantic, relating to the chaotic nature brought upon by Salmon Run. Their songs also have quite fast tempos which change regularly. They also use a variety of time signatures and rarely use common time (4/4), which helps to add to the confusion and disorientation. Each instrument usually has a solo in each piece, where it is singled out and plays a virtuous piece of music. Strange sound effects are usually thrown into some pieces, emphasizing the strange nature of Salmon Run.

Members
The following descriptions of the ω-3 trio are taken from a series of tweets dated 27 September 2017, from the official Japanese Splatoon Twitter. The names are from HaikaraWalker. Due to the length of the members' names, they are otherwise referred to by what instrument they play for readability.

The first child of Algin, the hidden blade of Yakiharas
After the long wait, let's introduce the members. He is the leader and composer, a cello player. It seems he's in his 50s. A stubborn person who does not listen to anything and who won't recognize anything but the most radical works, but cares about the delicate aspects of the atmosphere. Incredibly clumsy, he can only express these feelings in songs.

Valiant green flame born from Trout Hell Canyon
In charge of the timpani, he's in his late 20s, as people say. Always forward-facing, he puts his heart and soul into his performance. A sharp guy who does nothing but pushes forward toward his goal. While he's unskilled at taking into account the feelings of others, his one-of-a-kind violent rhythm cheers up and inspires all salmon warriors.

The loyal servant of the True Salmon King Hizumanasu
The DJ, he's the youngest out of all the members. With a considerably rough temperament, he's an individual that seems to take an attitude in opposition to most else. His behavior toward the older members is always irreverent and disrespectful. However, his talent and reckless-yet-fitting play style brings forth an unpredictable development, and thus creates an unpredictable groove that can be said to embody the true worth of ω-3's music.

Trivia

 * There is a piece of gear themed after the band, being the ω-3 Tee.

Etymology
The band's name is a reference to Omega-3 fatty acids, which are dietary acids most commonly found in fatty fish (such as salmon) and fish oil. This name references the band members being Salmonids, as well as the band being a trio.