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Identify a fish quiz

What is the fish in this photo?
Dark vertical bands on body; pelvic fins form disc a
Dark vertical bands on body; pelvic fins form disc
Checkered or cross-hatched pattern on body; separate fan-like pelvic fins b
Checkered or cross-hatched pattern on body; separate fan-like pelvic fins
look closely

Although the key descriptions of gobies and darters are similar, darters are much more common in fresh water, and gobies are much more common in brackish or salty water. If you can look at them from below, they have very different pelvic fins:

Chain Pickerel