Odessa understands that there are fish that swim in our fish tank. She also understands that there is a food you can eat called fish. Right now they are entirely different concepts with similar sounding words to her. One day though, she will make the connection.
I can see it going one of two ways. The first involves a look of horror and tears, while in the other she’s pulling a chair near the tank and reaching in to pluck out some tasty treats.