I find it interesting that the number seven is again used. This time there were seven loaves of bread but there is no number given for the number of fish. As such, the only number we can derive from this story is seven, again showing that Jesus gave a complete knowledge. During many of those occasions, He ate meat with them. What kind of meat this was isn't clearly stated, except in one place.
Fish is meat and was one of the most common kinds of meat because it was so readily available.
However, all the fishes in the water were spared this fate. If the symbol of the fish represents knowledge, then the symbolism of this is that through the flood, the knowledge of truth about God was preserved while the knowledge of the world was wiped away.