WAEC Fisheries (Alt B) OBJ 2025

01-10: ACDAADDBCD
11-20: ABCCDBABDD
21-30: CBCDCACCDB
31-40: BADABDDAAB

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WAEC Fisheries (Alt B) Essay 2025

Number 2

(2a)
(PICK ANY FIVE)
(i) Select a suitable site with good water supply and proper drainage.
(ii) Clear the area of any vegetation, debris, or obstacles.
(iii) Mark the boundaries of the pond and determine the shape and size.
(iv) Excavate the pond to the desired depth, ensuring proper sloping.
(v) Construct an inlet and outlet for water flow, ensuring proper drainage.
(vi) Line the bottom with clay or compact soil to prevent water leakage.
(vii) Fill the pond with water and allow it to settle for a few days.
(viii) Install aeration systems or water fountains if necessary.
(ix) Check for any leaks or issues and make necessary adjustments.
(x) Add appropriate fish species and ensure regular maintenance.

(2bi)
(PICK ANY THREE)
(i) Clear the pond of debris, weeds, and any obstacles.
(ii) Level and shape the pond to ensure proper water distribution.
(iii) Fill the pond with water, ensuring a steady supply.
(iv) Test the water for quality, including pH, temperature, and oxygen levels.
(v) Apply lime to adjust pH levels if necessary.
(vi) Fertilize the pond to stimulate plankton growth for fish feed.
(vii) Install proper inlet and outlet systems for water flow and drainage.
(viii) Ensure the pond is free of predators and harmful organisms.
(ix) Allow the pond to settle for a few days before introducing fish.
(x) Stock the pond with appropriate fish species for the environment.

(2bii)
(PICK ANY FOUR)
(i) Agricultural lime (calcium carbonate)
(ii) Quicklime (calcium oxide)
(iii) Hydrated lime (calcium hydroxide)
(iv) Dolomitic lime (calcium magnesium carbonate)
(v) Burnt lime
(vi) Slaked lime

(2c)
(PICK ANY FOUR)
(i) Reduces light penetration, affecting the growth of aquatic plants and plankton.
(ii) Decreases oxygen levels in the water, which can stress fish.
(iii) Impairs fish feeding behavior, as they rely on clear water to locate food.
(iv) Increases the risk of disease by limiting water quality and increasing pathogens.
(v) Causes sedimentation, which can clog gills and harm fish.
(vi) Reduces the overall aesthetic and environmental quality of the pond.

(2d)
(PICK ANY FOUR)
(i) Provide a balanced and nutritious diet to promote health and reproductive performance.
(ii) Ensure proper water quality, including maintaining appropriate temperature, pH, and oxygen levels.
(iii) Regularly check for diseases and parasites, and treat them promptly.
(iv) Maintain a proper breeding environment, including suitable breeding tanks or ponds.
(ii) Perform periodic health checks and remove any sick or weak fish.
(vi) Rotate or rest broodstock periodically to prevent overuse and ensure continued fertility.
(vii) Provide ample space for movement and reduce stress by avoiding overcrowding.
(viii) Manage breeding cycles to ensure the right timing for reproduction.

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Number 3

(3ai)
(PICK ANY TWO)
(i) It is cost-effective or free compared to buying from hatcheries.
(ii) It provides genetic diversity in fish stock.
(iii) Wild fish seeds may be more resilient to diseases.
(iv) It supports local fish biodiversity.
(v) It reduces dependency on hatchery facilities.
(vi) It offers a natural selection of species suited to the local environment.

(3aii)
(i) Clarias gariepinus (African catfish)
(ii) Oreochromis niloticus (Nile tilapia)

(3bi)
(PICK ANY FOUR)
(i) Ensure good water quality (pH, oxygen level, clarity).
(ii) Maintain appropriate water temperature.
(iii) Acclimatize fish before releasing into the pond.
(iv) Check for the absence of predators in the pond.
(v) Stock at the recommended density.
(vi) Monitor fish health and behavior after stocking.

(3c)
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 = 40/2 = 20 kg

Total daily feed required = 40 kg

(3d)
(PICK ANY FOUR)
(i) Water temperature
(ii) Fish species
(iii) Fish size and age
(iv) Water quality (e.g., dissolved oxygen, pH)
(v) Type and quality of feed
(vi) Fish health status

COMPLETED!!!