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Despite the name, shellfish are not fish. [2] Most shellfish are low on the food chain and eat a diet composed primarily of phytoplankton and zooplankton. [3] Many varieties of shellfish, and crustaceans in particular, are actually closely related to insects and arachnids; crustaceans make up one of the main subphyla of the phylum Arthropoda.
Shellfish include various species of molluscs, crustaceans, and echinoderms. In most parts of the world, fish are generally not considered seafood even if they are from the sea. In the US, the term "seafood" is extended to fresh water organisms eaten by humans, so any edible aquatic life may be broadly referred to as seafood in the US.
Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim.Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only by muscles.
An example of the latter is the farming of plankton and seaweed, shellfish like shrimp or oysters, and marine finfish, in saltwater ponds. Non-food products produced by mariculture include: fish meal , nutrient agar , jewellery (e.g. cultured pearls ), and cosmetics .
Nearly all seafood, including fish and shellfish, contains trace amounts of mercury from the surrounding water, which they absorb when they feed, per the U.S. Food and Drug Administration.
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Seafood is any form of sea life regarded as food by humans, prominently including fish and shellfish.Shellfish include various species of molluscs (e.g., bivalve molluscs such as clams, oysters, and mussels, and cephalopods such as octopus and squid), crustaceans (e.g. shrimp, crabs, and lobster), and echinoderms (e.g. sea cucumbers and sea urchins).
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