Fish Fillet is an item obtained by cooking certain types of fish.
Note: This item replaces Cooked Salmon in regular gameplay, meaning all functionality of Cooked Salmon exists for Fried Fish, too.
Fried Fish can be obtained by cooking Salmon, or some types of Custom Fish, with a Furnace, Smoker, Campfire, or Soul Campfire.
It can also be obtained any way the default Minecraft item "Cooked Salmon" can be obtained (killing a Salmon with Fire Aspect, etc).
Fried Fish is a food item, that can be consumed at a normal rate. It can only be eaten if the player is hungry. Fried Fish provides 9 nutrition (hunger points) and 9.6 saturation.
This item also has the same uses as the default Minecraft item "Cooked Salmon," including the ability to be fed to Wolves.
Carrots give 3 nutrition and 3.6 saturation
Bread gives 5 nutrition and 6 saturation
Steak gives 8 nutrition and 12.8 saturation