Unfurl the Inkfurlers at the end of the path at the center of the far edge of the map. Destroy the two crates on the other side, and the kettle is behind the crates.
The Mini Zapfishes are ordered here in terms of accessibility from spawn and other Mini Zapfishes.
Mini Zapfish 1
On the third tower from spawn, drop down from the first tower with the spawn, and defeat the Octoling below near the Mini Zapfish. Then, walk down to the second tower and defeat the Octoling Super Jumping to there, then walk down to the third tower and defeat the Octoling there near the Mini Zapfish.
Mini Zapfish 2
Behind the Splash walls on the fourth tower from spawn, walk down from Mini Zapfish 1 or drop down from the second tower, defeat the Octoling there under a Sprinkler, then bust through the splash walls and defeat the Octoling Super Jumping to near the Mini Zapfish. Then, walk up from the fifth tower to in front of the walls, or walk down from the fifth tower and up the wall with grating to behind the walls.
Mini Zapfish 3
In the center of the map, bust through the splash walls on the fifth tower, then drop down there or walk down from the sixth tower. Octolings would Super Jump to the path down from the fourth tower to the fifth, on top of the block on the fifth tower, on the sixth tower, or to the left of the Mini Zapfish. Another Octoling guards the Mini Zapfish to the right, and two sprinklers cover the area on walls of the fifth and fifth-to-last towers.
Mini Zapfish 4
To the left of Mini Zapfish 3, walk along the flat path and defeat the Octoling Super Jumping to the ledge. After defeating it, turn left at the ledge, and the Mini Zapfish is around the corner. Rotational symmetric to Sting Ray 1.
Mini Zapfish 5
On the block on the fifth-to-last tower, next to the farther Octosniper, either walk up the path from Mini Zapfish 4 or break the sprinkler on the wall and climb up from Mini Zapfish 3.
Mini Zapfish 6
On the fourth-to-last tower, walk up the path from Mini Zapfish 5, passing the Ink Cannon which can be used to take out Octosnipers, Octolings, and other hazards. Defeat the Octoling Super Jumping near the Mini Zapfish, then grab the Mini Zapfish. Then, climb up the tower on the side with grates.
Mini Zapfish 7
On the path between the third-to-last and fourth-to-last towers, an Octoling guards the Mini Zapfish nearby. Go up the path from Mini Zapfish 6, or alternatively climb up the wall behind the Ink Cannon.
Mini Zapfish 8
On the second-to-last tower from Mini Zapfish 7, continue up the path to the third-to-last tower with a ride rail back to the first tower with the player spawn. Defeat the Octoling Super Jumping to there. Then continue up the path to the second-to-last tower and defeat the Octoling Super Jumping to near the Mini Zapfish there. Then, break the lone crate on the path between the fourth and fifth towers to reveal a ride rail directly to the tower. The player should break the splash wall at the end to avoid dropping onto the grating below and be pressured by the Octoling there.
Collectibles
Sunken Scroll
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Location: From Mini Zapfish 6, swim through the grates to the left. Another grate is present with the crate containing the Scroll. Then, jump off the lower grate sticking out of the side of the tower and around the corner of the tower.
Sardinium
Location: In a crate submerged in ink in the far left corner of the last tower with the enemy spawn. Go up from Mini Zapfish 8 to the tower. An Octoling will spawn (two if the Octoling Super Jumping to the third-to-last tower is not triggered, which can only be bypassed by taking the ride rail on the player side) and Super Jump to there.
Armor
Octolings Ahoy has 4 pieces of armor to collect.
Armor 1 Location: In the crate to the right of Mini Zapfish 1.
Armor 2 Location: In the crate at the higher end of the mild slope on the sixth tower from spawn. Rotational symmetric to Armor 3.
Armor 3 Location: In the crate at the higher end of the mild slope on the sixth-to-last tower, next to the closer Octosniper. Rotational symmetric to Armor 2.
Armor 4 Location: In the top crate of the closer crate stack to the right of the path between the third-to-last and second-to-last towers.
Special Weapon
Sting Ray 1 Location: In a lone large taped crate to the right of Mini Zapfish 3. Rotational symmetric to Mini Zapfish 4.
Sting Ray 2 Location: In a crate in the pile of crates in the close left corner of the last tower with the enemy spawn. Go up from Mini Zapfish 8 to the tower. An Octoling will spawn (two if the Octoling Super Jumping to the third-to-last tower is not triggered, which can only be bypassed by taking the ride rail on the player side) and Super Jump to there.