I seemed to notice that Lox spawns are lower, perhaps since you can breed them now, which I had to start doing because of their seemingly lower rate in the spawners? Before, they seemed to spawn quite frequently in my seed and I could stock up on meat--filling chests. I began to start emptying my stock quickly since the update with Lox breeding, hence again the need to resort to animal husbandry...to refill my coffers.