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Classification based on morphology
- Bony fish:
           These are fish that have the structure of their body made up of bones e.g. tilapia, carps, catfish, croakers, mackerel, etc:
- Cartilaginous fish: These are fish which have the structure of their body made up of cartilage e.g. dogfish, rays, shark, etc.
Other types of aquatic organisms
There are many other organisms that are living inside water, apart from fish which are used as food by man. These include;
- Crustaceans (shellfish): Such as prawns, shrimps, crayfish, lobsters and crabs.
- Reptiles: Such as river snakes, turtles, and crocodiles.
- Mammals: Whales, Hippopotamus, dolphins, seals, and porpoises.
- Molluscs (Snails): Such as river snails, periwinkle, oyster, squid, clam, and octopus
EVALUATION
WEEKEND ASSIGNMENT
- What are aquatic organisms?
- Give two examples of each of the following:
- Reptiles
- Molluscs
- Crustaceans
