The swordtail is a beginner-friendly tropical fish species. This hardy fish comes in various vibrant colors and can be kept in a freshwater tank as small as 10 gallons.

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McGill University. "Color Pattern Spurs Speciation In Tropical Fish." ScienceDaily. ScienceDaily, 14 June 2007. <www.sciencedaily.com / releases / 2007 / 06 / 070612142947.htm>.

The species is usually found in temperate and tropical waters. The opah is an unusual looking fish, according to NOAA, they have a round, flat body that’s silvery gray in color.

Beachcombers were stunned after discovering a 100-pound tropical fish on the shore of Oregon last Wednesday. It’s since been identified as an Opah, a pelagic species of fish that inhabits tro… ...

This color change phenomenon is seen in other fish species too. In Trinidadian guppies (Poecilia reticulata), the eyes of dominant fish turn black when they are preparing to attack a rival.