I think fishes do get Anthrax,
The infection is inside the anus. The fish stop feeding, and is emaciated, very thin with disproportionately big head and eyes. The body loses its streamline curve and burgles at the anus in a angular slop.
Anthrax Rife frequencies seem to remove the rectangular burgle and return the fish to its normal feeding appetite.
Rife frequencies for Anthrax and general bacterial infections are posted on youtube.
This is the same fish supported by waterweeds on the water surface after Anthrax frequencies for about 1 hour. The burgle at its anus has reduced, but this fish maybe too far gone to be saved.
