2025 Fisheries WASSCE Theory & Objectives - Questions & Answers
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Answers / Solutions
FISHERY-OBJ
01-10: ACDAADDBCD
11-20: ABCCDBABDD
21-30: CBCDCACCDB
31-40: BADABDDAAB
Question 1 (Originally Q2)
- (a) Steps in constructing an earthen pond:
(PICK ANY FIVE)
- Select a suitable site with good water supply and proper drainage.
- Clear the area of any vegetation, debris, or obstacles.
- Mark the boundaries of the pond and determine the shape and size.
- Excavate the pond to the desired depth, ensuring proper sloping.
- Construct an inlet and outlet for water flow, ensuring proper drainage.
- Line the bottom with clay or compact soil to prevent water leakage.
- Fill the pond with water and allow it to settle for a few days.
- Install aeration systems or water fountains if necessary.
- Check for any leaks or issues and make necessary adjustments.
- Add appropriate fish species and ensure regular maintenance.
- (bi) Steps in preparing an earthen pond for stocking:
(PICK ANY THREE)
- Clear the pond of debris, weeds, and any obstacles.
- Level and shape the pond to ensure proper water distribution.
- Fill the pond with water, ensuring a steady supply.
- Test the water for quality, including pH, temperature, and oxygen levels.
- Apply lime to adjust pH levels if necessary.
- Fertilize the pond to stimulate plankton growth for fish feed.
- Install proper inlet and outlet systems for water flow and drainage.
- Ensure the pond is free of predators and harmful organisms.
- Allow the pond to settle for a few days before introducing fish.
- Stock the pond with appropriate fish species for the environment.
- (bii) Types of lime used in pond preparation:
(PICK ANY FOUR)
- Agricultural lime (calcium carbonate)
- Quicklime (calcium oxide)
- Hydrated lime (calcium hydroxide)
- Dolomitic lime (calcium magnesium carbonate)
- Burnt lime
- Slaked lime
- (c) Effects of turbidity on fish pond:
(PICK ANY FOUR)
- Reduces light penetration, affecting the growth of aquatic plants and plankton.
- Decreases oxygen levels in the water, which can stress fish.
- Impairs fish feeding behavior, as they rely on clear water to locate food.
- Increases the risk of disease by limiting water quality and increasing pathogens.
- Causes sedimentation, which can clog gills and harm fish.
- Reduces the overall aesthetic and environmental quality of the pond.
- (d) Ways of maintaining broodstock:
(PICK ANY FOUR)
- Provide a balanced and nutritious diet to promote health and reproductive performance.
- Ensure proper water quality, including maintaining appropriate temperature, pH, and oxygen levels.
- Regularly check for diseases and parasites, and treat them promptly.
- Maintain a proper breeding environment, including suitable breeding tanks or ponds.
- Perform periodic health checks and remove any sick or weak fish.
- Rotate or rest broodstock periodically to prevent overuse and ensure continued fertility.
- Provide ample space for movement and reduce stress by avoiding overcrowding.
- Manage breeding cycles to ensure the right timing for reproduction.
Question 2 (Originally Q3)
- (ai) Reasons for collecting fish seeds from the wild:
(PICK ANY TWO)
- It is cost-effective or free compared to buying from hatcheries.
- It provides genetic diversity in fish stock.
- Wild fish seeds may be more resilient to diseases.
- It supports local fish biodiversity.
- It reduces dependency on hatchery facilities.
- It offers a natural selection of species suited to the local environment.
- (aii) Culturable fish species in West Africa:
- Clarias gariepinus (African catfish)
- Oreochromis niloticus (Nile tilapia)
- (bi) Precautions when stocking a fish pond:
(PICK ANY FOUR)
- Ensure good water quality (pH, oxygen level, clarity).
- Maintain appropriate water temperature.
- Acclimatize fish before releasing into the pond.
- Check for the absence of predators in the pond.
- Stock at the recommended density.
- Monitor fish health and behavior after stocking.
- (c) Calculation of daily feed:
Number of fish = 5,000
Average weight per fish = 200 g = 0.2 kg
Total weight = 5,000 × 0.2 = 1,000 kg
Feed rate = 4% of body weight = (4/100) × 1,000 = 40 kg
Since feeding is done twice daily, each feeding = 40 kg / 2 = 20 kg
Total daily feed required = 40 kg
- (d) Factors affecting feeding rate of fish:
(PICK ANY FOUR)
- Water temperature
- Fish species
- Fish size and age
- Water quality (e.g., dissolved oxygen, pH)
- Type and quality of feed
- Fish health status
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