Answer:

darter

AnswerCrossword Clue
DARTERPerch relative
DARTERSnail ... (threatened fish)
DARTERSmall freshwater fish
DARTERFreshwater fish
DARTERSwift sudden runner.
DARTERSmall fresh-water fish.
DARTERSnakebird.
DARTERSnakebird
DARTERFish or bird
DARTERAnhinga
DARTERFurtive one
DARTERSnail ... (endangered fish)
DARTERFast freshwater fish
DARTERFreshwater fish of the perch family
DARTERSand ... (perchlike fish)
DARTERFlitting one
DARTERFast fish