3 Answers

If you’ve ever looked up close at a fish in an aquarium or a fish bowl, you’ve probably had trouble spotting the fish’s ears. That’s because fish don’t have ears on the outside of their bodies like we do!

Fish are able to hear, thanks to special ear-like structures on the inside of their bodies. These “inner ears” allow fish to pick up on sounds underwater. Even though fish don’t use their hearing to talk, like we do, being able to pick up sounds helps them know about other underwater creatures who might be swimming along near by, which can be helpful if the creature is a big hungry shark!

A fish who is underwater or in a tank probably can’t hear you if you try to talk to it. If you’re in the water with the fish, such as a lake, the fish might be able to hear the noises you make, although it would be pretty fishy business if the fish was able to understand you!

http://www.whyzz.com/do-fish-have-ears

Jaws drop when Kerryn Parkinson tells people she studies fish ear bones for a living. Her parents are amused by her work and her children’s friends often give her a stern look and say, “Fish don’t have ears’’.
But fish do indeed have ears – inner ear organs that are sensitive to how deep and how fast they’re swimming. And in a scientific twist, Parkinson, a research officer with the University of Technology, Sydney (UTS), can determine the life history of a fish, from hatchling to adult, by studying tiny bones embedded in those internal navigational aids.

Read more here>>http://www.smh.com.au/environment/yes-fish-do-have-ears-20130513-2jgrk.html

Here's one who does. Mike Trout, Los Angeles Angels (they're under the helmet).

Huh, can't hear the question, I have water in my ears!