Gyo(2001)

Gyo

The floating smell of death hangs over the island. What is it? A strange, legged fish appears on the scene... So begins Tadashi and Kaori's spiral into the horror and stench of the sea. Here is the creepiest masterpiece of horror manga ever from the creator of Uzumaki, Junji Ito. Hold your breath until all is revealed.

Something's rotten in Okinawa...

(Source: VIZ Media)

Included one-shots:
Volume 2:
Daikokubashira Hiwa (大黒柱悲話, The Sad Tale of the Principal Post)
Amigara no Dansou no Kai (阿修羅断層の怪, The Enigma of Amigara Fault)