No, they are a decomposer
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The immature herring gets eaten by the arrow worm, then the adult herring eats the arrow worm.
The name of the worm is "arrow worm," commonly known for their distinctive flat, diamond-shaped casings in the ocean. These casings are made of secreted mucous and planktonic particles, which help the arrow worm to camouflage and protect itself from predators.
Based on the description provided, the worm might be a flatworm, such as a planarian. Planarians are known for their dark brown coloration, large triangular head, and flat body shape. They can grow up to 8 cm in length and usually have a diameter around 1 mm.
Vermicast , worm manure, worm humus, or worm castings.
Hook worm.