FishFood.COB
This is a food object, once eaten by your creatures it will do the following to them: 
hunger -- by 250
tiredness -- by 100
sleepiness -- by 100
glycogen ++ by 200

Class = 33969920

copy the fish.cob into your creatures dir (or where ever you store your COBS) and Fish.spr into images dir.
put it into your word like any other COB file.