Blue – Blue is a very common color in saltwater tropical fish but there are also many freshwater fish that exhibit bold and brilliant blue hues. Many betta fish, for example, exhibit deep blue colorations and there are several blue cichlid species as well.In open water, fish might be blue to match the background, while many fish in darker, deeper waters are black. Higher up in the sunlit coastal shallows, patterns such as spots, stripes, and patches may break up a fish's outline to confuse predators. Flashes of bright color on a fish may even scare predators away.
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Blue – Blue is a very common color in saltwater tropical fish but there are also many freshwater fish that exhibit bold and brilliant blue hues. Many betta fish, for example, exhibit deep blue colorations and there are several blue cichlid species as well.In open water, fish might be blue to match the background, while many fish in darker, deeper waters are black. Higher up in the sunlit coastal shallows, patterns such as spots, stripes, and patches may break up a fish's outline to confuse predators. Flashes of bright color on a fish may even scare predators away.