Strong's #2486: ichthus (pronounced ikh-thoos')
 of uncertain affinity; a fish:--fish.
Thayer's Greek Lexicon:
 ̓́ 
 
  ichthus 
 
 1) a fish
 
  Part of Speech: noun masculine
Relation: of uncertain affinity
 
Usage:
This word is used 21 times:
Matthew 7:10: "Or if he ask  a fish, will he give him a serpent?"
Matthew 14:17: "five loaves, and two  fishes."
Matthew 14:19: "and the two  fishes, and looking up to heaven, he blessed,"
Matthew 15:36: "loaves and the  fishes, and gave thanks, and broke them, and"
Matthew 17:27: "a hook, and take up  the fish that first cometh up; and when thou hast opened"
Mark 6:38: "Five, and two  fishes."
Mark 6:41: "and the two  fishes, he looked up to heaven, and blessed,"
Mark 6:41: "and the two  fishes divided he among them all."
Mark 6:43: "and of the  fishes."
Luke 5:6: "they enclosed a great multitude  of fishes: and their net broke."
Luke 5:9: "at the draught of the  fishes which they had taken:"
Luke 9:13: "loaves and two  fishes; except we should go and buy"
Luke 9:16: "and the two  fishes, and looking up to heaven, he blessed"
Luke 11:11: "a stone? or if  he ask a fish, will he for a fish give"
Luke 11:11: "he ask a fish, will he for  a fish give him a serpent?"
Luke 24:42: "him a piece of a broiled  fish, and of a honeycomb."
John 21:6: "it for the multitude  of fishes."
John 21:6: "it for the multitude  of fishes."
John 21:8: "dragging the net  with fishes."
John 21:11: "land full of great  fishes, a hundred and fifty and three: and"
1 Corinthians 15:39: "another flesh of beasts, another  of fishes, and another"