[1] gills [2] swim bladder [3] Weberian ossicles [4] ears [5] heart [6] brain [7] liver [8] stomach and intestine [9] kidney [10] spleen [11] gall bladder img from:https://www.anglingtimes.co.uk/advice/science/articles/inside-a-fish I read about fish diseases and found something called “Fish Hole In The Head Disease”or hexamitosis, respectively hexamitiasis. Hexamitiasis is a parasitic disease that can affect … Continue reading