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[Leeko]

I found a thread from march detailing someone's idea for defending their fortress with carp, and decided to try it. I embarked to a temperate desert with a river after adding the [PET] tag to longnose gar, sturgeon, and carp. Lo and behold, the river
is home to a trio of sturgeon and a longnose gar. I laid out my plan to make a large area adjacent to the river that I can drain and fill at will using some pumps and a huge wall of floodgates, which would be right in front of a huge wall of traps. It all started to come together, but I had a growing concern about the fish. By the time half my floodgate wall was complete, the sturgeon and longnose gar had left the map, and no more have entered (to my knowledge - I was checking every 5 minutes or so via the unit list) in the half year or so since they left. Meanwhile, several packs of vultures and camels have migrated through...

Anyone know if there's some known bug that would prevent new fish from coming through?

[Creamcorn]

I find there to be no less than one group of animals (or a large predator type) to be on any 3X3 local map. I'm not too sure of larger maps, but considering what you've written. I would say that you can probably only two groups of local migrating wild life on your map.

Just kill them, it will make the whole migration of animals faster. Also, have you checked if your fishes have died?

[Leeko]

They're not on the unit list as deceased, and I don't have a military or any hunters yet, so I don't see how they could have died. Thanks for the advice, when my fortress is a little bigger I'll draft some useless dorfs and get right on that. I can already smell the abundance of camel meat...

EDIT: If they had died, more would come to the region right?

[Sphalerite]

I have never known river creatures to respawn.  I don't know that they actually ever do, and given the way creature spawning occurs I'd expect them to randomly spawn on the map edges on land like ocean creatures do sometimes if they did.

[GaxkangtheUnbound]

You might be able to keep the carp/gar/whatever alive by pumping water into it.

[ChickenLips]

That seems to explain my situation.  I've got a longrunning fortress in its 10th year, and I haven't seen any more carp or other river creatures since the winter freeze killed off the first pack of 'em. 

[Bralor]

I recently embarked in a major river with a bit of a lake on one side of the map. The first day I had like 6 caps in the river and the lake. About a year later they were gone and never saw any other water creature until a stingray showed up 3 years later. So I think they spawn, but rearly.

[Leeko]

Guess my carp defense plan is a no-go.

Keeping them alive was never the issue though. I was going to build their cages in front of 1x1 ponds filled by bucket brigade, and dump them right in. Taming an animal doesn't require releasing it from its cage and as long as the cage was in 4/7 water when the trap went off the fish won't air-drown. I almost hate to ask, but does there exist a memory hack that would let me add some more fish back in? 

[Leeko]

So it would seem adding the [PET] tag to various fish in the raws had an awesome side-effect. Some elf merchants just arrived with a tamed pike in a cage. Huzzah!

[GaxkangtheUnbound]

So it would seem adding the [PET] tag to various fish in the raws had an awesome side-effect. Some elf merchants just arrived with a tamed pike in a cage. Huzzah!

It will probably die of air loss soon.

[Double A]

It'd be in a terrarium, so I don't see how.

[GaxkangtheUnbound]

It'd be in a terrarium, so I don't see how.

Aquarium, to be exact.
Is it green glass?

[Double A]

What does green glass have to do with it?

[Sphalerite]

Fish will survive in cages just fine, even if those cages aren't made of glass.  Just as air-breathing creatures will survive in non-glass cages dumped underwater.  Cages are funny that way.

[Leeko]

Taming an animal doesn't require releasing it from its cage and as long as the cage was in 4/7 water when the trap went off the fish won't air-drown.

I have successfully inserted my new tamed pike into a 1x1 pool. Now to wait for the elves to bring more...
Oh and it was in a normal cage. Cages are indeed funny that way.