Class: Junior Secondary School 2 (JSS 2 / JS2)
Term: 3rd Term
Week: 3
Age: 13 years
Duration: 45 minutes
Subject: Pre-Vocational Studies
Curriculum Theme: Agricultural Science
Previous Lesson: Fishery: Definition of Fishery.
Topic: FISHERY II
Subject Matter: Classes of fish based on Habitat (freshwater fish and saltwater fish) and Morphology (bony fish and cartilaginous fish).

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define freshwater fish and saltwater fish.
Identify examples of bony fish and cartilaginous fish.
Differentiate between fish based on their habitat and morphology.

Affective Domain:

Appreciate the diversity of fish species.
Show interest in learning about aquatic life.

Psychomotor Domain:

Classify various fish species into their respective categories based on given criteria.
Draw simple sketches illustrating the differences between bony and cartilaginous fish.

Discuss the importance of different fish types in the ecosystem and for human consumption.
Collaborate with peers to identify and group fish examples.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Pre-Vocational Studies.
State Unified Scheme of Work for Junior Secondary Schools.
Pre-Vocational Studies for Junior Secondary Schools 2 Textbook.
https://www.google.com/search?q=freshwater+fish
https://www.google.com/search?q=saltwater+fish
https://www.google.com/search?q=bony+fish
https://www.google.com/search?q=cartilaginous+fish

Instructional Materials

The teacher will teach this lesson with the aid of:

Pictures of various freshwater fish (e.g., Tilapia, Catfish).
Pictures of various saltwater fish (e.g., Mackerel, Sardine).
Diagrams or models showing the skeletal structure of bony and cartilaginous fish.
Video clips illustrating fish in their natural habitats and their physical characteristics.
Whiteboard or chalkboard and markers/chalk.

Rationale for the Lesson

This lesson helps pupils understand the different categories of fish, which is important for identifying species, managing fisheries, and appreciating aquatic ecosystems. Knowing these classifications also supports future studies in aquaculture and environmental science.

Prerequisite/Previous Knowledge

Pupils are expected to have basic knowledge of what fish are, their general characteristics, and their importance as a source of food, from their previous lessons on fishery.

Lesson Content/Board Summary

Classes of Fish

Classification Based on Habitat

Fish can be classified based on the type of water body they live in:

Freshwater Fish: These are fish that live in freshwater bodies such as rivers, lakes, ponds, and streams. They cannot survive in salty water.
- Examples: Tilapia, Catfish (Aro), Mudfish, Carp, Guppy.
Saltwater Fish: These are fish that live in oceans, seas, and estuaries, which contain high concentrations of salt. They cannot survive in freshwater.
- Examples: Mackerel (Titus), Sardine, Tuna, Cod, Shark, Barracuda.

Classification Based on Morphology (Skeletal Structure)

Fish can also be classified based on the type of skeleton they possess:

Bony Fish (Osteichthyes): These fish have skeletons made primarily of bone. They typically have scales, a swim bladder for buoyancy, and an operculum (gill cover).
- Characteristics:
  - Skeleton made of bone.
  - Presence of scales.
  - Have a swim bladder.
  - Possess an operculum covering the gills.
  - Usually have a homocercal (evenly lobed) tail fin.
- Examples: Tilapia, Catfish, Mackerel, Sardine, Tuna, Cod.
Cartilaginous Fish (Chondrichthyes): These fish have skeletons made primarily of cartilage, which is a flexible tissue, not bone. They do not have swim bladders and use their oily livers for buoyancy. They have gill slits instead of an operculum.
- Characteristics:
  - Skeleton made of cartilage.
  - Skin is covered with placoid scales (dermal denticles), making it rough.
  - Lack a swim bladder.
  - Have 5-7 pairs of gill slits instead of an operculum.
  - Usually have a heterocercal (unevenly lobed) tail fin.
- Examples: Sharks, Rays, Skates, Chimaeras.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to name some types of fish they know and where these fish live.
Pupils’ Activity: Pupils respond by naming various fish and mentioning their habitats.
Learning Point: Pupils recall prior knowledge about fish and their environment.

Step 2: Explanation of Fish Classification

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains that fish are diverse and can be grouped or classified based on certain characteristics, such as where they live and what their bodies are made of.
Pupils’ Activity: Pupils listen attentively and understand the concept of classification.
Learning Point: Pupils understand the importance of classifying fish.

Step 3: Classes of Fish Based on Habitat

Time: 10 minutes
Teaching Skill: Demonstration/Discussion
Teacher’s Activity: The teacher uses pictures and video clips to explain freshwater fish and saltwater fish, giving examples for each. The teacher highlights the differences in their habitats.
Pupils’ Activity: Pupils observe the pictures and videos, identify the fish, and list examples for each category.
Learning Point: Pupils learn to differentiate fish based on their habitat.

Step 4: Classes of Fish Based on Morphology

Time: 10 minutes
Teaching Skill: Explanation/Visualisation
Teacher’s Activity: The teacher explains the concept of bony fish and cartilaginous fish, using diagrams or models to show the differences in their skeletal structures and other features like scales/skin and gill covers/slits.
Pupils’ Activity: Pupils observe the diagrams/models, listen to the explanation, and ask questions for clarification.
Learning Point: Pupils understand that fish can be classified by their internal structure.

Step 5: Examples and Discussion

Time: 5 minutes
Teaching Skill: Questioning/Engagement
Teacher’s Activity: The teacher asks pupils to give more examples of bony and cartilaginous fish, encouraging them to think of local species. The teacher clarifies any misconceptions.
Pupils’ Activity: Pupils provide examples and discuss the characteristics they have learned.
Learning Point: Pupils reinforce their understanding through practical examples and discussion.

Step 6: Board Summary/Note Taking

Time: 5 minutes
Teaching Skill: Consolidation
Teacher’s Activity: The teacher writes the key points of the lesson (definitions, characteristics, and examples of each class of fish) on the board.
Pupils’ Activity: Pupils copy the notes from the board into their notebooks.
Learning Point: Pupils consolidate the learned information for future reference.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define freshwater fish and give two examples.
What are saltwater fish? Mention two examples.
State two differences between bony fish and cartilaginous fish.
Give two examples of bony fish and two examples of cartilaginous fish.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the lesson by reiterating the main classes of fish based on habitat and morphology. The teacher then gives homework: “Draw and label one example of a bony fish and one cartilaginous fish.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils reflect on the lesson and are given an activity to reinforce learning.

Lesson Keywords

Habitat – The natural home or environment of an animal, plant, or other organism.
Morphology – The study of the forms of things, in this case, the structure of fish.
Freshwater fish – Fish that live in rivers, lakes, and ponds.
Saltwater fish – Fish that live in oceans and seas.
Bony fish – Fish with skeletons made of bone.
Cartilaginous fish – Fish with skeletons made of cartilage.
Operculum – A bony flap covering the gills of bony fish.
Gill slits – Openings for respiration found in cartilaginous fish.

Differentiation

For pupils who are struggling, the teacher will provide simpler diagrams and more direct examples, focusing on identifying key features. For advanced learners, the teacher will encourage research into more diverse examples or specific adaptations of fish to their habitats.

Note for teachers using this lesson plan

Teachers should ensure they have clear, visible pictures or video clips to aid understanding, especially for the morphological differences between bony and cartilaginous fish. Encourage pupils to relate the examples to fish commonly found or consumed in their local environment.