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From adfe939e1377279c32fe68488f5285302613c9ba Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Thu, 14 Apr 2016 17:48:56 -0500
Subject: [PATCH] Water mobs should only spawn in the water


diff --git a/src/main/java/net/minecraft/server/EntityWaterAnimal.java b/src/main/java/net/minecraft/server/EntityWaterAnimal.java
index 90d33af95..251555713 100644
--- a/src/main/java/net/minecraft/server/EntityWaterAnimal.java
+++ b/src/main/java/net/minecraft/server/EntityWaterAnimal.java
@@ -11,7 +11,15 @@ public abstract class EntityWaterAnimal extends EntityInsentient implements IAni
     }
 
     public boolean cM() {
-        return true;
+        // Paper start - Don't let water mobs spawn in non-water blocks
+        // Based around EntityAnimal's implementation
+        int i = MathHelper.floor(this.locX);
+        int j = MathHelper.floor(this.getBoundingBox().b); // minY of bounding box
+        int k = MathHelper.floor(this.locZ);
+        Block block = this.world.getType(new BlockPosition(i, j, k)).getBlock();
+
+        return block == Blocks.WATER || block == Blocks.FLOWING_WATER;
+        // Paper end
     }
 
     public boolean canSpawn() {
-- 
2.12.2.windows.2