Conservation status of species changes often as new threats arise and current threats subside. Fish and marine life are often threatened by human activities such as overfi shing, pollution of ocean and fresh water habitats, and climate changes. When it comes to making choices about what seafood to purchase and consume, what resources are available to consumers to know that fi sh they are buying is not vulnerable or endangered?

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Parasitic infections

A parasite is an organism that lives in the body of another organism and obtains food at the expense of the host. There are two kinds of parasites they are internal and external. An internal parasite lives inside another organism and is known as endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite.