Factorio Forums

Аfter some amount of time when factorio running in the background (I can't remember something specific about that), they swim to specific 'borders', leaving the rest part of the lake free (on this picture the right part of lake was absolutely free, it just take me few seconds to prepare screenshot, so several fishes already swim there, but you still can see "empty" space in the lake : I see this multiple times on regular basis.
After some time when I watching them, they randomly swimming, redistributing randomly across the water.

normal behavior after few minutes of watching: Not a critical thing, but confusing a bit.

84876

This is a Performance Optimization.

It would be ok, if they just stop moving., but i want to say that they are swimming and grouping near some "vertical" lines.

SaboteurKiev wrote: Fri Aug 08, 2025 6:00 pm It would be ok, if they just stop moving., but i want to say that they are swimming and grouping near some "vertical" lines.

Those are chunk boundaries. When they move into the chunk outside the radius where they're active, they stop moving, so many can pile up at the boundary.

But this looks strange, maybe it will be better just to stop them at all?
Because it looks, like they are moving between chunks...

Some time I even though , that pump attract them