multiple fish releases count against one max critters counter

I have several pools of water and I decided to grow more fish. Found that the fish release in my new pools start with the same critter counter as the existing one, which makes having more pools quite useless. Works perfect for the critter drop-off though.

[EDIT]

I think I know what happened, as the pools are not proberly seperated as "room". Setting some doors and walls around the water pump and ladders, making the water pool seperated from the rest of the world makes the fish release calculate correct.

Is it intended that the fish release works this way? Fish farming differs from critter farming a lot and thus a different calculation of room size / seperate rooms or pools would be ok, I think...