Fish Preservation by Sun-Drying and Smoking for SS 3

Class: SS 3
Term: First Term
Week: 5
Age: 16 years
Duration: 45 minutes
Subject: Fisheries
Curriculum Theme: Fish Preservation
Previous Lesson: Post-Harvest Fish Processing
Topic: Fish Preservation by Sun-Drying and Smoking
Subject Matter: Methods of preservation: Sundrying; Wet-smoking; Dry smoking; Frying; Freezing; Filleting; Canning; Salting(brining); Practical

Specific Objectives

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

Cognitive Domain

• Define fish preservation.
• State at least five methods of fish preservation.
• Describe the process of sun-drying fish.
• Explain the differences between wet-smoking and dry smoking.
• Identify the importance of various preservation methods.

Affective Domain

• Appreciate the economic benefits of preserving fish.
• Value the role of proper hygiene in fish preservation.
• Show interest in learning practical fish preservation techniques.

Psychomotor Domain

• Outline the steps involved in sun-drying fish.
• Illustrate the basic setup for smoking fish.
• Discuss the practical application of post-harvest processes for fish.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Fisheries for Senior Secondary Schools Textbook
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• Charts showing different methods of fish preservation
• Pictures or diagrams of sun-drying racks and smoking kilns
• Samples of sun-dried and smoked fish (if available)
• Videos demonstrating fish preservation techniques

Rationale for the Lesson

This lesson is important for students to understand how to prevent spoilage and extend the shelf life of fish, which is a highly perishable food item. Mastering these preservation techniques helps reduce post-harvest losses, ensures food security, and creates economic opportunities for fish farmers and traders. It provides practical knowledge essential for sustainable fisheries management.

Prerequisite/Previous Knowledge

Students should have basic knowledge of fish harvesting and the general characteristics of fish as a food source.

Lesson Content/Board Summary

Fish Preservation by Sun-Drying and Smoking

Introduction to Fish Preservation

Fish preservation involves methods used to prevent fish from spoiling and to extend its shelf life, making it available for consumption over a longer period. This is crucial because fish is highly perishable due to its high moisture content and nutrient composition.

Methods of Fish Preservation

There are several methods used to preserve fish, each with its own process and benefits:

1. Sundrying: This is one of the oldest and simplest methods. It involves removing moisture from fish by exposing it to direct sunlight. The fish is usually cleaned, gutted, and sometimes salted before being spread on mats or racks under the sun.
2. Wet-smoking: Involves exposing fish to smoke at relatively lower temperatures (40-60°C) for a shorter duration, which partially cooks the fish and imparts a smoky flavour. The fish retains more moisture compared to dry-smoked fish.
3. Dry smoking: Involves exposing fish to smoke at higher temperatures (70-90°C) for a longer duration, leading to significant moisture reduction and a harder texture. This method results in a longer shelf life due to lower moisture content.
4. Frying: Fish can be preserved by frying it in oil until crispy, then storing it in airtight containers, sometimes submerged in the oil. This method reduces moisture and creates a barrier against microbial growth.
5. Freezing: This method involves lowering the temperature of fish to below 0°C, which inhibits microbial growth and enzymatic activity. Fish is typically cleaned, packaged, and then frozen rapidly to maintain quality.
6. Filleting: While not a preservation method itself, filleting (removing bones and skin) prepares fish for other preservation methods like freezing, smoking, or canning by reducing bulk and improving processing efficiency.
7. Canning: Fish is cleaned, processed, cooked, and sealed in airtight cans. The canning process involves high heat to sterilize the product, ensuring a very long shelf life at room temperature.
8. Salting (Brining): This method uses salt to draw out moisture from the fish and inhibit bacterial growth. Dry salting involves rubbing salt directly onto the fish, while brining involves soaking the fish in a concentrated salt solution.

Practical Application of Fish Preservation

The practice of post-harvest processing is essential for maintaining the quality and value of fish. This involves several steps:

1. Handling: Careful handling immediately after harvest to prevent physical damage and contamination.
2. Cleaning and Gutting: Removing scales, gills, and internal organs to reduce bacterial load and spoilage.
3. Washing: Thoroughly washing the cleaned fish with clean water.
4. Preparation for Preservation: This may include slicing, filleting, or salting depending on the chosen method.
5. Application of Method: Implementing the chosen preservation technique (e.g., arranging on drying racks for sun-drying, placing in a smoking kiln for smoking).
6. Storage: Storing the preserved fish in appropriate conditions (e.g., dry, cool place for smoked fish; freezer for frozen fish; pantry for canned fish).

Teaching Methods/Instructional Techniques

Discussion, Explanation, Demonstration, Question and Answer, Visual Aids, Practical Activity (simulated)

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Engaging/Activating Prior Knowledge

Teacher’s Activity: The teacher greets the students and asks them about their experiences with fresh fish and how quickly it spoils. The teacher then introduces the topic of fish preservation and its importance.

Pupils’ Activity: Students respond to questions and share their experiences regarding fish spoilage.

Learning Point: Introduction to fish spoilage

Step 2: Meaning and Importance of Fish Preservation

Time: 7 minutes

Teaching Skill: Explanation/Discussion

Teacher’s Activity: The teacher explains what fish preservation means and discusses why it is important (e.g., preventing waste, ensuring food security, economic benefits). The teacher uses charts to illustrate the concept.

Pupils’ Activity: Students listen attentively, ask questions, and contribute to the discussion on the importance of preservation.

Learning Point: Definition and value of preservation

Step 3: Sundrying Method

Time: 6 minutes

Teaching Skill: Description/Visualisation

Teacher’s Activity: The teacher describes the process of sun-drying fish, showing pictures or diagrams of fish on drying racks. The teacher highlights key steps like cleaning, salting, and proper exposure to sunlight.

Pupils’ Activity: Students observe the visuals, take notes, and ask clarifying questions about the sun-drying process.

Learning Point: Sundrying process and steps

Step 4: Smoking Methods (Wet and Dry)

Time: 7 minutes

Teaching Skill: Comparison/Explanation

Teacher’s Activity: The teacher explains both wet-smoking and dry smoking methods, comparing their processes, temperatures, and effects on the fish. Diagrams of smoking kilns are used.

Pupils’ Activity: Students listen, compare the two smoking methods, and note down their differences.

Learning Point: Wet and dry smoking differences

Step 5: Other Preservation Methods

Time: 6 minutes

Teaching Skill: Enumeration/Briefing

Teacher’s Activity: The teacher briefly explains other methods such as frying, freezing, filleting, canning, and salting (brining), outlining the basic principle of each.

Pupils’ Activity: Students listen and identify the various preservation methods discussed.

Learning Point: Overview of other methods

Step 6: Practical Application of Post-Harvest Process

Time: 4 minutes

Teaching Skill: Application/Discussion

Teacher’s Activity: The teacher guides a discussion on the practical steps involved in post-harvest processing leading to preservation, using sun-drying or smoking as a primary example. The teacher emphasizes hygiene.

Pupils’ Activity: Students participate in the discussion, outlining the practical steps and importance of hygiene.

Learning Point: Post-harvest practical steps

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

1. What is fish preservation?
2. Mention three methods of preserving fish.
3. Briefly describe the process of sun-drying fish.
4. State one difference between wet-smoking and dry smoking.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding preservation methods

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on fish preservation methods into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 1 minute

Teaching Skill: Summarising

Teacher’s Activity: The teacher briefly summarises the main points of the lesson, reiterating the importance of fish preservation for food security and economic development.

Pupils’ Activity: Students listen and assimilate the concluding remarks.

Learning Point: Reinforcement of preservation importance

Continuous Assessment/Further Study

Type: Homework/Practice Exercise

Instruction: Answer the following questions in your notebook:

1. Explain why fish preservation is necessary.
2. Describe the steps you would take to preserve fish by salting (brining).
3. Research and write a short paragraph on any traditional fish preservation method used in your local community.

Lesson Keywords

• Preservation – The process of treating food to prevent spoilage.
• Sundrying – Drying fish by exposing it to sunlight.
• Smoking – Preserving fish by exposing it to smoke.
• Wet-smoking – Smoking at lower temperatures, retaining more moisture.
• Dry smoking – Smoking at higher temperatures, reducing moisture significantly.
• Frying – Preserving by cooking in hot oil.
• Freezing – Preserving by lowering temperature below 0°C.
• Filleting – Removing bones and skin from fish.
• Canning – Sealing processed fish in airtight containers for preservation.
• Salting – Preserving fish using salt.
• Brining – Soaking fish in a salt solution.

Differentiation

For learners who grasp concepts quickly, encourage them to research the chemical changes that occur during different preservation methods. For learners needing more support, provide simplified diagrams and allow them to work in pairs to describe the steps of sun-drying or smoking, using visual aids as a guide.

Suggested Lesson Videos

For further understanding, students can search on YouTube for:

• “Fish preservation methods SS3”
• “How to sun dry fish in Nigeria”
• “Fish smoking techniques”

Teacher Guide for Using This Lesson Plan

Before the lesson, ensure you have all visual aids ready, including charts or diagrams of preservation methods, especially for sun-drying and smoking. If possible, bring samples of preserved fish to aid understanding. Begin by engaging students with questions about fish spoilage to connect with their prior experience. Systematically explain each preservation method, focusing on the processes involved and their benefits. Encourage students to ask questions and participate actively in discussions. During the practical application step, guide a discussion on the hygiene and safety aspects of post-harvest processing. Use the evaluation questions to check comprehension. Ensure students copy the Board Summary notes accurately into their notebooks. Provide clear instructions for the continuous assessment task, encouraging independent research where applicable.