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
Due to the length of the members' names, they are otherwise referred to by what instrument they play for readability.

Gallant green flame born from Trout Hell Valley
Gallant green flame born from Trout Hell Valley (トラウト地獄谷より生まれし雄々しき緑の炎) is the timpanist, who plays with all his heart and soul. He is always facing ahead and pushing toward his goals, which is typical for his species. While he's unskilled at taking into account the feelings of others, his one-of-a-kind violent rhythm cheers up and inspires all Salmonid warriors.

Will-be-loyal manservant to the True Salmon Emperor Hizunamasu
Will-be-loyal manservant to the True Salmon Emperor Hizunamasu (真の鮭帝ヒズナマスの忠実なる僕) is the group's DJ, a rough-tempered Salmonid with an oppsitional stance towards everything, causing him to act disrespectfully towards the other members. However, his talent and reckless-yet-fitting playstyle creates an unpredictable groove that can be said to show the true worth of the band's music.

Eldest Child of Algin, the blade that hides the grilled belly
Eldest Child of Algin, the blade that hides the grilled belly (アルギンの第一子、ヤキハラースが隠せし刀) is the band's cellist and composer, and its leader. He is stubborn and does not listen to anyone else nor does he recognize anything else than the most radical works. However, he has a delicate side that cares about atmosphere of a place, but he is clumsy and can only express these feelings via songs.

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.

"Hizunamasu" is the Japanese name for a dish of thinly-sliced salmon head cartilage and daikon seasoned with vinegar.

"Yakiharasu" ("grilled belly"), spelled in Japanese with an elongated vowel and a flipped word order, references "Shake no Harasuyaki", a dish of grilled salmon belly.