Do fish respawn in Low areas?

[MadameHardy]

If I leave a fish spot and come back after tie has passed, will there be more fish there?

[Nikas Zekeval]

Depleted spots do seem to get more fish over time. But there are two reasons a spot could read as depleted.

One, you pulled up too many fish.

Two, it is the wrong time of the day to catch those fish.

Some fish are daytime (06:00-18:00) or nighttime (18:00-06:00) only. You can only start fishing them during the right time. However if you are in the middle of reeling one in when the time goes from day to night or night to day? The game will let you pull that last fish in, and then say the area is depleted, but fish would still be there if it was earlier.

For example, you are fishing up Cod, a daytime species and start at 17:00. Let's say there are six Cod in that fishing spot. You manage to pull up two, one being a trophy fish that let you finish quickly, and cast for a fish at 17:55. Assuming you don't mess up the minigame? You'll get that third fish, and then be told the area is depleted in the minigame. Even though you only caught half the cod. By the time you pulled the third fish in? It was after 18:00 and the cod spot is gone till next morning.

At which point there are three more cod waiting, plus whatever regeneration the game gives the spot.

[Banzai]

There are also books you can "read" while boating around that will give you a chance to not deplete a spot even if you completely fish it, etc.

[daggaz]

The answer to OP's question is yes. If you leave a spot as "low" it will regenerate back up over time. Usually a day or two it seems to hit medium. Even if you fish to depletion, the spot regenerates. Here it seems to take much longer, but I haven't bothered to test that observation.

Other than the very early game however, there's little point to not depleting a spot, and even then the early game benefit is razor thin.

[Fakskis]

Don't know if this helps, but I just depleted a Stingray spot right next to the Little Marrow dock, and only after sleeping for 7 days in a row did Stingrays show up again at that spot, so depleting a fishing spot will probably mean that fish will only return to that spot after a week. (This is only one example of some minor testing with one type of fish in one location though, your results may vary with other fish and other spots)