Minecraft wiki entry for Ocean, associated text: The lukewarm ocean has light blue water at the surface and generates in regions with slightly warm biomes like jungles and savannas. Its floor is made of sand, with occasional patches of dirt, gravel and clay in shallower areas. Ocean ruins that generate in lukewarm and warm oceans are made of sandy materials, as opposed to the stony materials that make up ruins in colder oceans. Cod, salmon‌[Bedrock Edition only], tropical fish and pufferfish‌[Java Edition only] may spawn here, alongside the other aquatic mobs. This biome also has more seagrass and less kelp compared to colder ocean variants.