CLARKSBURG, W.Va. (WBOY) — Almost any species of crayfish can have a mutation that occasionally makes them blue, but West Virginia has four distinct species that are almost always blue.

Biologists are monitoring an Australian crayfish that surprisingly showed up in Texas, fearing it could threaten local ...

Another top choice for a crayfish tank is the forktail blue-eye. This small, 2-inch-long rainbowfish captures attention with its brilliant blue eyes, sunny-yellow fins, and unique forked tail design.