Fish have nostrils and use them to identify potential food items , I know they can smell worms and bread as well , movements will attract them or make them run away…..depending on if it appears to be potentially food or potentially a predator….
Even turtles use them turtle nostrils underwater too ….
Reaction strikes are common, but many times they only close the distance and then give it sniff test …..seen it a zillion times , just saying