Explanation

(a) Types of Shell Fish (i) Cockles (ii) Oysters (iii) Scallops (iv) Shrimps (v) Clams (vi) Lobsters (vii) Crabs (vii) Prawns (ix) Crayfish (x) Mussels (xi) Periwinkles (xii) Crustaceans (xiii) Mollusca/ Molluscs.
(b) Explanation on the three classes of fish (i) Oily Fish - Oily fish have oil distributed all over their bodies and are mostly dark in colour. (ii) White Fish: - White fish or lean fish have most of their fat deposited in the liver and are mostly white in colour. (ii) Shell Fish: They have a protective covering of shell. They are of two groups: Molluscs and Crustaceans. 

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