2025 NECO FISHERIES: 2026 NECO Fisheries practical (Fishery) Verified Ans. (4946)

(1ai)

A: Oreochromis niloticus

B: Heterobranchus longifilis

C: Lates niloticus

D: Bagrus bayad

(1aii)

draw the diagram

(1aiii)

In a tabular form

A:

(PICK ANY TWO)

(i) It has no barbels around the mouth.

(ii) The body is laterally compressed and deep.

(iii) The caudal fin is rounded or slightly forked.

(iv) It is herbivorous, feeding mostly on algae and plant matter.

(v) It belongs to the family Cichlidae.

D:

(PICK ANY TWO)

(i) It has well-developed barbels around the mouth.

(ii) The body is elongated and cylindrical.

(iii) The caudal fin is deeply forked.

(iv) It is carnivorous, feeding on smaller fish and aquatic organisms.

(v) It belongs to the family Bagridae.

(1bi)

In a tabular form

=Specimen A=

(i) Type of mouth shape: Terminal mouth (mouth opens at the tip of the head).

(ii) Shape of caudal fin: Rounded or slightly forked caudal fin.

=Specimen B=

(i) Type of mouth shape: Sub-terminal or inferior mouth (mouth located below the snout).

(ii) Shape of caudal fin: Rounded caudal fin.

=Specimen C=

(i) Type of mouth shape: Large terminal mouth (opens at the front and is wide).

(ii) Shape of caudal fin: Deeply forked caudal fin.

=Specimen D=

(i) Type of mouth 'copied from e x a m p l a z a s . c o m free' shape: Sub-terminal or inferior mouth.

(ii) Shape of caudal fin: Forked caudal fin.

(1bii)

(i) A: Cichlidae

(ii) B: Clariidae

(iii) C: Centropomidae (or Latidae)

(iv) D: Bagridae

(2ai)

E: Dugout canoe (or model)

F: Seine net

G: Funnel entrance trap

H: Gill net

(2aii)

draw the diagram

(2aiii)

(PICK ANY THREE)

(i) Both are fishing gears used in capturing fish.

(ii) Both are made from netting materials like nylon or synthetic fibers.

(iii) Both are operated in water bodies such as rivers, lakes, or ponds.

(iv) Both have floats attached to keep the upper part buoyant.

(v) Both use lead sinkers to keep the lower edge submerged.

(vi) Both allow the capture of multiple fish at once.

(vii) Both can be used manually by fishermen without engines or machines.

(2bi)

E:

(PICK ANY ONE)

(i) It is used for transporting fishermen to and from fishing grounds.

(ii) It is used to carry fishing gear such as nets and traps.

(iii) It helps in monitoring and harvesting from fish enclosures.

(iv) It is used during fish rescue operations in ponds or flooded areas.

(v) It facilitates access to deeper parts of a water body for fishing.

G:

(PICK ANY ONE)

(i) It is used to passively catch fish or crustaceans.

(ii) It traps aquatic animals that swim in through the narrow funnel.

(iii) It reduces stress on captured fish compared to active gears.

(iv) It is ideal for selective fishing with bait.

(v) It is used in both freshwater and brackish water 'copied from e x a m p l a z a s . c o m free' environments.

(2bii)

(PICK ANY TWO)

(i) Clean the trap regularly to remove debris and mud.

(ii) Dry properly after use to prevent rust or rot.

(iii) Store in a dry, shaded place when not in use.

(iv) Inspect regularly for damage or wear and repair as needed.

(v) Apply protective coating (e.g., anti-rust or paint) if made of metal.

(vi) Avoid dragging the trap over rough surfaces to prevent breakage.

(2biii)

E:

(PICK ANY TWO)

(i) Wood

(ii) Nails or metal fasteners

(iii) Paint or varnish

(iv) Rope

(v) Iron sheets (for reinforcement)

(vi) Tar or resin (for sealing cracks)

H:

(PICK ANY TWO)

(i) Nylon thread

(ii) Cork floats

(iii) Lead sinkers

(iv) Twine or rope

(v) Mesh netting

(vi) Plastic or metal rings (for edge support)

(3ai)

I: Secchi disc

J: pH meter

K: Poultry dropping

L: Thermometer

(3aii)

check the image below

(3aiii)

(PICK ANY THREE)

(i) Calibrate the pH meter regularly using standard buffer solutions.

(ii) Rinse the electrode with distilled water before and after each use.

(iii) Store the electrode in appropriate storage solution when not in use.

(iv) Avoid touching the electrode bulb with fingers to prevent contamination.

(v) Keep the pH meter away from direct sunlight or high temperatures.

(vi) Replace the electrode when it becomes faulty or gives unstable readings.

(vii) Turn off the meter after use to conserve battery life and prevent damage.

(3bi)

(PICK ANY THREE)

(i) Acts as organic fertilizer to promote plankton growth in ponds.

(ii) Enhances natural fish food availability through increased primary productivity.

(iii) Reduces the cost of purchasing commercial fish feed.

(iv) Improves the nutrient content of the pond bottom soil.

(v) Encourages faster growth of fish by providing protein-rich microorganisms.

(vi) Boosts the overall fertility of the pond ecosystem.

(vii) Increases fish yield due to improved food supply and pond conditions.

(3bii)

(i) Cow dung

(ii) Pig manure

(3biii)

(i) Handle with care to avoid breakage.

(ii) Do not 'copied from e x a m p l a z a s . c o m free' use in boiling water to prevent damage.

(iii) Clean after use to avoid contamination between measurements.

(3biv)

I:

(i) Avoid taking readings on windy or rainy days to ensure accuracy.

(ii) Lower the disc vertically and slowly into the water for correct measurement.

J:

(i) Do not immerse the pH meter above the maximum immersion level.

(ii) Rinse the electrode with distilled water before and after use to prevent contamination.