possible the Babelfish?
Dopefish references appear in many games, but the Dopefish is green and quite a bit fatter.
edit: it looks like the 3-headed fish from the Simpsons, but with only one head.
edit 2: I figured it out. Its the fish that goes into making the Mr.Sparkle logo, also from the Simpsons. Fish+bulb=Mr.Sparkle.