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What do they look like?
Grayling are interesting fish. Adults can reach considerable length, are they generally are dark blue on their backs and grayish violet on their sides. These fish are typically iridescent and gorgeous creatures. They have one huge dorsal fin that soars on top of their bodies. This fin is gray to pink in color and has blue spots outlined in bright red. The colors of their fins vary depending where they're living. These fish generally grow to 10 to 14 inches in length and weigh less than a pound.

How do they behave?
Grayling spawn in early spring. Three- and four-year-old graylings will hang out in shallow waters in order to begin breeding. The colorings on male graylings are quite brilliant during these months, in efforts to impress the females. Graylings don't build nests. The male grayling will wrap his huge dorsal fin around the back of the female, and the female soon drops a few thousand eggs into the water. The current of the shallow stream picks up the eggs and buries them under the sand at the bottom of the water. The eggs hatch two to three weeks later.

What should you know about them?
Young grayling eat algae and small aquatic insects. Once they reach maturity, they'll continue eating these insects, as dragonflies, beetles, larvae, ants and spiders are among their favorite foods.