Fish are aquatic vertebrate animals with gills, provided with fins and whose body is most often covered with scales. They are found abundantly in both freshwater and seas

Crustaceans are a sub- phylum of arthropods , thes are animals whose bodies are covered with a chitinoprotein exoskeleton called an exocuticle and often impregnated with calcium carbonate .

Cephalopods are a class of invertebrate animals belonging to the phylum mollusca.