Fish are everywhere in Animal Crossing: New Horizons. You have to work on capturing them all if you want to see a complete museum, and some of them vary depending on the time of year, time, and how you capture them. If you are looking to catch the stringfish, you have to go to a particular place.
The stringfish will appear from December to March in your game, from 16:00 p.m. to 9:00 a.m., which means you don't want to wake up and chase this fish. It's probably something you're looking for later in your afternoon. The only way to capture this fish is to locate it on an island with a cliff, which means you need a ladder. For those looking to unlock the ladder, you receive the DIY recipe when three new residents want to join your town, and Tom Nook gives you the quest to bridge. When you drop off the second house, Tom calls you to provide you with a ladder. You now have access to the cliffs.
Now that you have access to the cliffs, you can scale them and try to find one of the pools of water resting on them. You want to make sure you bring bait to spawn one of the biggest fish shadows and a higher quality fishing rod to catch it. Cast the fish bait into the water until you see a larger shadow of fish in the water, and from there, cast your rod. Once the bobber goes in the water, reel it in to see what you catch.
The fish come from various places in Animal Crossing, so be sure to watch out for the shadow in the water. Once you've captured the Stringfish, you can sell it for 15 Bells.
