There are 18 different fish you can collect in Endacopia’s fishing minigame. However, you won’t find all of them at once. Each fish appears at a specific time of the day, so you’ll need to come back and fish during different time slots to complete your collection. This Endacopia Fishing guide lists all 18 fish locations and the time when you can catch them.
Basic Fishing Guide Info
There are 6 different time slots in total: Day 1, Day 2, Day 3, Night 1, Night 2, and Night 3. Each time slot has 3 unique fish, making 18 fish altogether.
I’ll use the same time labels as the fishing clock image below. So, when the clock hand points to Day 1, you’ll find the three fish listed under the Day 1 section.

How to Unlock Fishing in Endacopia?
Before you can start fishing, you’ll need to find the Fishing Paper.
You can get it by using the Metal Detector in the sand. Once you’ve found the paper, you’ll be able to start fishing and collect all 18 fish.
One important thing: You’ll also need to leave the fishing rod after catching all the fish to unlock the achievement. Don’t forget this part!
Spoilers for all fish below!
Day 1
On my first day of fishing, I can catch these fish:
Nautilus

Colisa Lalia

Jantic Fish

Day 2
On my second day of fishing, I caught the following fish:
Peter Panini

What kind of fish is this? Ewww!!
Seahorse

Maybe I should list this as a Horse, not as a Fish.
Singin’ Fish

Day 3
This is my last day of fishing, and I caught these fish:
Eel

Reddest Fish Ever

Sea Man

A sea man really?
Night 1
Here we go again!
Pirate

OMG! Did I catch Davy Jones?
Skele-Fish

It’s the skeleton of the fish! Did someone eat it?
RC Ship

Night 2
On my second night of fishing, I found these pals:
Crab

Starfish

Big Worm

Night 3
Drawing of a Fish

Is this drawing made on plastic?
Jelly

Crate

??? Catch

While fishing, you might occasionally catch a blurred-out head labeled ???. Don’t worry about this one. It doesn’t count towards your fish collection or the achievement. As far as I can tell, it’s just a little jumpscare.
What Do You Get After Catching Every Fish?
Once you’ve collected all 18 fish, inspect the Fishing Paper again.
You’ll receive the Lost Key as a reward. Make sure you check the paper again after completing your collection; otherwise, you might miss it.
How to Use the Lost Key?
The Lost Key is used to unlock another hidden secret in Endacopia.
First, you’ll need to complete the Shack Puzzle. After solving it, switch the game to Windowed Mode and enter the small concrete room. There’s a hidden safe inside that you can unlock using the Lost Key.
Opening the safe reveals some additional lore, so it’s definitely worth checking out.
Where Is the Aquarium?
If you want to check all the fish you’ve collected, you can visit the Aquarium.
It’s located inside the house on the left side of the waterfall. You can head there anytime to look at your collection.

