Aquatic mobs are not spawning / Fish spawned from buckets count towards the aquatic mob cap again

Commenting to say that I opened my prior mentioned from-19w world (which has not seen an iota of aquatic life) in 1.14.1 pre1 and found squid and salmon spawning in their usual river spots.

This might have been fixed, either intentionally or incidentally (perhaps tangentially related to MC-147890?). Emphasis on "might". Correlation does not necessarily imply causation, so would be nice if Adam or Val could confirm or deny if their worlds are fixed now too.

A map to test on or a repro case would be helpful. I cannot reproduce this on a map created before 1.14 that is updated to 1.14 nor on a new 1.14-created map.

I'm on a realm started with the 1.13 release and I also noticed that all sea life except turtles and guardians disappeared with the 1.14 release. Last night I saw squid and fish again.

Cannot reproduce in 1.14.1-pre2.

I haven't seen any new reports about this since 1.14-pre1 released (Quite the contrary actually, I have seen some reports about the spawn rate being too high now!).

So, I'm assuming it was fixed along with MC-147890. Resolved as fixed.

The 2 worlds I previously mentioned: 

My wife's world sees aquatic mobs as expected since 1.14.1

My world still does not see aquatic mobs after 1.14.1 I've tried loading backups into 1.14.1 and none will see aquatic mobs.  

Noticed that about a third of my old worlds have no more aquatic mobs spawning in 1,14,1, so this issue is certainly not fixed. While most worlds show almost excessive amounts of fish and squids in rivers, some other worlds have not a single fish, dolphin or squid spawn in any river or ocean biome in the entire world. In one case, I watched all existing dolphins and fish despawn immidately when entering the chunk and had no more spawning afterwards, the oceans and rivers are completely empty. This really needs to be fixed ASAP.

Only in old worlds or in new ones as well? Was the world opened in 1.14?

Affects 1.4.2-pre1 too, still completely empty oceans. Happens in (some) old worlds only, doesn't matter if they were opened in 1.14 before or not. I've also noticed that Drowned do spawn frequently in deep oceans, the issue only seems to affect fish, squid and dolphins.

I have experienced this issue in my main world, but somehow managed to fix it by trying to recreate this bug in other worlds. I created two new worlds in 1.13.2, and teleported over 200 hundred blocks above an ocean. I then upgraded to 1.14 pre-release 5, checked out the ocean for aquatic mobs, then teleported back 200 blocks above the ocean. I upgraded to 1.14 and again checked, then teleported back up. I then downgraded the world to 1.14 pre-release 5, performed the same test, and then upgraded back to 1.14. After aquatic mobs still spawned, I gave up, went back onto my world and found aquatic mobs spawning again. Since I only had one world with issues, I can no longer perform testing as I cannot recreate the bug. However, I did manage to resolve it on my own, but I do not understand how I did it.

Still not fixed in 1.14.2-pre2

This is still not fixed in 1.14.2-pre3!
Does this mean 1.14 is going to be the Update No-more Aquatic?

It would still be good to know in which worlds this issue occurs and in which it doesn't. Some people are reporting that they have way too many aquatic mobs spawning (see MC-151337), so something must be wrong with the worlds in which this issue occurs.

Had two worlds from in Minecraft Alpha and Beta convert dircetly to 1.4.1, both have aquatic mobs spawning just fine. Tested one back from 2013 (directly converted to 1.14.1 and the 1.4.2 pre-releases), no aquatic mobs spawning. Other worlds I started in MC 1.11.2 and in the 1.13 snapshots work fine and have masses of them spawning. The huge LAN world I’m playing on since Minecraft 1.8.6 (played in every major MC version since then) has completely empty oceans. Can’t seem to notice any dependence on generated/opened versions, used gamemode, etc.

Hard to upload any affected worlds here when there’s a 10 MB limit. You can download the 2013 world here if you want: http://www.mediafire.com/file/lgqqic87b3v8s5b/Test_2013.rar/file

The other one has over 500 MB …

my world was created in 1.13 and the mobs are not spawning in 1.14.1

The Realms world we started in 1.13 and updated to 1.14 and then to 1.14.1 hasn't had any squid, dolphins, or fish-type aquatic mobs spawning for quite some time, possibly ever since the 1.14 update.  Only fish seen are in areas where, prior to the update, I had played around with catching fish in buckets and releasing them, so it seems that they remain persistent, as do of course the many other fish we have in an aquarium in spawn chunks.  Is it possible that MC-134702 is back somehow, and fish-from-buckets are counting towards aquatic/passive mob cap?  I explored some new chunks, and turtles that spawn with new-chunk render are spawning, but no squid or dolphins or tropical fish were seen in ~20km of swimming through newly-rendered oceans.  We also have a lot of villagers in spawn chunks, so if they are somehow counting towards passive/aquatic mob cap, that could be an explanation, but we've had cats spawning in artificial-village areas, so that wouldn't seem to be the problem. 

Bingo! It's MC-134702 all over again. You should be able to use the data pack from that ticket to workaround this issue (if it still works, I haven't checked yet).

Edit: Just checked, the data pack should still work. I attached it here as well.

Can confirm the data pack works in my big LAN world, can see lots of fish an dolphins again. Although, tested it in the other affected world from 2013 too (download link in my comment above), it doesn't work here. That's strange ... (attached a screenshot)

(Update: Had the gamerule doMobSpawning set to false in the 2013 world, it works when set to true ... whoops 😛)

The data pack is only a workaround, the core problem itself still needs to be fixed in the code of the game.

I know, Mojang has to fix it properly.

Fixed in 1.4.2-pre4!

Yep, definitely the fish-in-buckets bug.  I collected all the fish in my aquarium back up into buckets and stuck em temporarily in a chest, then went swimming in the ocean.  Plenty of fish and dolphins spawning, and while squid spawns do seem a lot less than before (only saw one in several minutes of swimming), squids ARE spawning at least occasionally, which is a heck of a lot better than it was before. 

Zombie Hunter, can you confirm that it's fixed in 1.4.2-pre4?  It's not on the official changelog for that snapshot...

its not fixed in(at least for me) 1.14.2-pre4, and i can confirm it is the bucket in fish bug, i did the same has martin and sudently all passive aquatic mobs started to spawn again.

Checked again, all my affected worlds have aquatic mobs spawning again in 1.14.2-pre4. No data pack applied either, it works in the vanilla game now.

I can confirm that this issue is indeed not fixed in 1.14.2.

If you have applied the data pack once in your world, it should solve the issue forever (even if you disable the data pack again) until you place enough fish from buckets in permanently loaded chunks.

Good to know. Loaded backups from my affected worlds which never had the data pack applied, no aquatic mobs spawning. So yes, still not fixed.

Update Non-Aquatic is still not aquatic in 1.14.3-pre1!

It appears to be fixed in 1.14.3-pre2, can see aquatic mobs spawning in rivers and oceans again (fresh backup of affected world, never any datapack applied). Can someone confirm this?

I'm still able to reproduce this in 1.14.3-pre2 following the steps from MC-134702. This issue won't occur if you don't have any fish from buckets in your spawn chunks (or otherwise permanently loaded chunks).

Also having this issue in 1.14.2, issue occurs when an aquarium in our world is loaded, if the chunks are allowed to unload fish start spawning again.  

Definitely a problem in 1.14.2 and even in 1.14.3-pre4 still. Easy to reproduce: create a new world, with seed 4.

Now create a small tank:

/fill -56 64 115 -69 68 126 glass
/fill -57 65 116 -68 68 125 water

Once you add about 24 tropical fish there, all animal spawning in the ocean around you stops.

I have the same problem in my world created in 1.13.1 (updated in many snapshots 1.14) now it is in 1.14.3 (with many aquariums and therefore also many fish taken from buckets) I noticed that when I went from 1.13.2 in a snapshot 1.14 a pufferfish in an aquarium had disappeared and no more fish were generated in the sea. Now I put the datapack, the fish are generated again in the oceans, but 3-4 fish disappeared in the second aquarium (some tropical fish disappeared and a puffer fish). I hope that if I update to the next snapshot 1.15 the datapack will continue to work and will not give errors.

After the datapack worked, I tried to remove it all remaining vanilla and it continues to work everything, (The fishes removed after installing the datapack are gone, they have disappeared).
I will no longer catch a fish until this problem is solved (I hope it will be fixed in 1.14.4)

But I still don't see fish in the rivers but only in the oceans or large spaces of water is it perhaps a case and will reappear soon?

I have the same issue on my survival server 1.14.3.

Datapack doesn't work for me, I have it enabled but still, no aquatic mobs. :/

After updating to 1.14.4 this is suddenly an issue again. I've flown circles around my small island, usually beaming with aquatic life – now all I see is the occasional drowned; no dolphins, no fish, no squid.

Our squid farm, that was producing ink like crazy in 1.14.3 has yet to produce one sac.

Multiplayer server, 1.14.4

 [EDIT] Must have been some temporary hickup directly following the update, now everything works as normal again. Oceans and rivers are again full of life!

1.14, this issue still exists for me on my multiplayer server.

This bug is not fixed, I don't know why Mojang said it is.
No fishes or squids anywhere in my world.