White, opaque spherules are selectively consumed by 8 species of fish out of 14 species examined, and a chaetognath.    From Wordnik.com.  [Our Plastic Ocean Turns Forty] Reference

Arrow worms (Phylum Chaetognatha) are abundant planktonic organisms and important predators in many food webs; yet, the classification and evolutionary relationships among chaetognath species remain poorly understood.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference