--- a/net/minecraft/world/entity/animal/EntityPufferFish.java
+++ b/net/minecraft/world/entity/animal/EntityPufferFish.java
@@ -155,7 +155,7 @@
         int i = this.getPuffState();
 
         if (entityinsentient.hurtServer(worldserver, this.damageSources().mobAttack(this), (float) (1 + i))) {
-            entityinsentient.addEffect(new MobEffect(MobEffects.POISON, 60 * i, 0), this);
+            entityinsentient.addEffect(new MobEffect(MobEffects.POISON, 60 * i, 0), this, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK); // CraftBukkit
             this.playSound(SoundEffects.PUFFER_FISH_STING, 1.0F, 1.0F);
         }
 
@@ -171,7 +171,7 @@
                     entityplayer.connection.send(new PacketPlayOutGameStateChange(PacketPlayOutGameStateChange.PUFFER_FISH_STING, 0.0F));
                 }
 
-                entityhuman.addEffect(new MobEffect(MobEffects.POISON, 60 * i, 0), this);
+                entityhuman.addEffect(new MobEffect(MobEffects.POISON, 60 * i, 0), this, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK); // CraftBukkit
             }
         }
 
