What colors are used for camouflage in the mid-water?

In mid-water environments, animals often use colors such as blue, green, and purple for camouflage, as these hues blend well with the surrounding water. Many species also employ countershading, where they are darker on the top and lighter on the bottom, helping them avoid detection from both predators and prey. Additionally, some mid-water creatures may exhibit bioluminescence, using soft glows to confuse or attract other species.