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Show fet Propulsion Isn't New; Fish Have Long Used It Jet propulsion isn't as new as -e think. There are about 270 species of fish, including cuttlefish, which move through the water ind very quickly by expelling ;ets of water from their gill slits, which are placed in just the right Dosition to make full use of this orm of power. Tail and fins are juite motionless in this method of mbmarine travel. If jet-propulsion fish finds it is xaveling in wrong direction, it limply puts on emergency brakes oy sucking in water through gill slits and expelling it from mouth. |