Caveat lector, sometimes these are animals and sometimes food.  Fellow scholars exploring fish in the Hobbit must judge for themselves whether each instance is about a comestible.  Almost all of them are in Chapter 5, just as we would wish them to be.

• 05.011 fish whose fathers swam in,
• 05.011 also there are other things more slimy than fish.
• 05.012 He was looking out of his pale lamp-like eyes for blind fish,
• 05.012 Sometimes he took a fancy for fish from the lake,
• 05.012 and sometimes neither goblin nor fish came back.
• 05.050 a fish jumped out
• 05.051 Fish!
• 05.051 fish!’ he cried.
• 05.051 It is fish!’
• 05.054 talking of fish,
• 05.054 Fish on a little table,
• 05.087 and tired of fish.
• 05.128 cold fish,
• 14.007 Anything from floods to poisoned fish.
• 14.018 and poisoned fish,
• 16.018 That was no fish!’