Broader definitions of chemicals or chemical substances can be found, for example: the term 'chemical substance' means any organic or inorganic substance of a particular molecular identity, including â (i) any combination of such substances occurring in whole or in part as a result of a chemical reaction or occurring in nature.
The major groups of worms include various species of flatworm, annelid, ribbon worm, spiny-headed worm, and aschelminth. Worms typically have an elongated, tubelike body, usually rather cylindrical, flattened, or leaflike in shape and often without appendages.
Scientists call Fish Worms nematodes.. The species involved are usually Terranova decipiens or Porrocaecum decipiens.. They are pests that infest the bodies of fish. This infestation occurs naturally, and can't be prevented. They are parasites that live in both the stomach and flesh of the fish. They can grow up to 1 1/2 inches (4 cm) long, and be brown or cream-coloured. This mostly occurs in fish in areas where there are seals, therefore most of the fish affected are fish that live near the shore. Cod are very affected, as well as flounder, haddock, herring, mackerel, Pacific rockfish, red snapper, salmon, sole and whiting. The worms spend part of their life inside the stomachs of seals, where they lay their eggs. The eggs pass into the sea and hatch. When fish are caught and filleted, the fillets can be inspected for these worms on a glass table with a light underneath. The process is called candling. Not all the worms are always caught.