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Arrow worms

Arrow worms are planktonic marine worms in the exclusive phylum Chaetognatha. They are transparent and arrow-shaped zooplankton. Chaetognaths swim using their tail fin for propulsion and the body fins to stabilize and steer their streamlined bodies. Arrows worms are an important food source for small fish and other animals in Saanich Inlet.


Reference
http://en.wikipedia.org/wiki/Chaetognatha
http://depts.washington.edu/fhl/zoo432/plankton/plchaetognatha/chaetognatha.html