Shellfish are aquatic invertebrates which have a shell. From the options given below, select the odd one out.
A
Mussels
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B
Crabs
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C
Lobsters
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D
Sardines
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Solution
The correct option is D Sardines Shellfish is a term used in fisheries to represent the aquatic invertebrates bearing an exoskeleton (shell). These are widely used as food across the world. It includes various species of molluscs (mussels and oysters), crustaceans and echinoderms.
Mussels are bivalve molluscs. Crabs and lobsters are crustaceans.
Sardines are true fishes (vertebrates) that belong to the super class Pisces. These are marine fishes and are widely consumed by humans. They are a rich source of omega-3 fatty acids.