Ghana education service

14
UNIT

SPECIFIC OBJECTIVES


CONTENT

TEACHING AND LEARNING ACTIVITIES

EVALUATION

UNIT 2

FISH ECOLOGY






















UNIT 3

INTRODUCTION
TO FISH
GENETICS

The student will be able to
1.2.1 assess environmental factors affecting fish population.
1.2.2. outline the causes of pollution in natural water bodies.
1.2.3 assess the basic ecological processes within a fish habitat.
1.3.1 explain the principles of genetics.
1.3.2 explain the concept of inheritance Environmental conditions in fish habitats
- temperature
- dissolved oxygen
- salinity
- pH
- turbidity
- light
- nutrients
- upwelling phenomenon Pollution in natural water bodies - reservoirs, rivers, lakes, lagoons, estuaries, sea) Ecological processes in a natural fish habitat
- feeding behaviour
- predation and competition
- food chain and web
- food pyramid
- fish mortality
- natural and fishing mortality
- adaptation to environment Principles of genetics as related to fishes
- chromosomes
- genes
- genetic crossings
- phenotype
- genotype Inheritance of external characters in fishes. Students to discuss environmental conditions offish habitats and how they affect fish populations. Students to discuss optimal environmental conditions necessary for fish survival. Teacher to arrange for water test kits for students to test the various environmental conditions listed under content using water from a pond, stream, lake, lagoon, river, sea, etc. Students to discuss causes of pollution in natural water bodies. Students to discuss the effect of water pollution on fish populations. Students to construct feeding relationship in a fish habitat (e.g. food chain and food web. Students to discuss the effects of changes in number of predators and prey on fish populations. Students to discuss the causes offish mortality. Students to explain the principles of genetics in fish breeding, e.g. development of the super male tilapia Genetically Improved Farmed Tilapia (GIFT. Students to discuss the concept of inheritance of characters in fishes. Describe the method for measuring turbidity in a fish habitat. Compare the salinity levels in freshwater and seawater. Discuss the effect of water pollution on fish populations. Construct a food web in a fish habitat. What is the effect of competition in fish populations Describe the processes involved in the production of the super male tilapia. Explain how fish inherit skin colour.

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