2025 NECO FISHERIES: 2025 NECO FISHERY ANSWERS (4466)

(1ai)

(i)It reduces the activeness of the fishes

(ii)It hinders the growth of algae and other aquatic plants 

(iii)It cause decrease in the amount of light for photosynthesis. 

(iv)Turbidity can also increase water temperature.

(1aii)

Tabulate

-Artisanal-

(i)It is done in a small  scale 

(ii)Low technology is involved  

(iii)Low capital is required

(iv)The fishing practice is undertaken by individual fishing household.

-Commercial-

(i)It is done in a large  scale 

(ii)High technology is involved  

(iii)High capital is required

(iv)The fishing practice is not  undertaken by individual fishing household

(1bi)

Monoculture  is the type of aquaculture that involves the stocking of more than one species of fish in the same rearing facility at a given time.

(1bii)

screen is a structure built to prevent fish from entering hydroelectric dams, aqueducts, diversion rivers, or other man-made structures. 

(1biii)

Fishing is the capture of aquatic organisms in marine, coastal and inland areas. 

(1biv)

Fish fillets comprise the flesh of the fish usually obtained by slicing the fish parallel to the spine, rather than perpendicular to the spine as is the case with steaks

(1c)

(i)Feeding 

(ii)Periodic fertilization

(iii)prevention of 'copied from e x p o c o d e . n e t free' the introduction of serious disease agents;

(iv)confinement of disease outbreaks to affected areas

(2ai)

(2aii)

(i)Concrete Ponds: are usually constructed with concrete and sometimes reinforced to make them stronger. 

(ii)It can be constructed on dry land.

(iii)It cannot be flooded.

(iv)It has manageable surface area.

(2b)

STEP 1: PREPARE THE SITE. 

STEP 2: PEG OUT THE POND AREA. 

STEP 3: CONSTRUCT CLAY CORES.

STEP 4: EXCAVATE THE POND AND CONSTRUCT DYKES. 

STEP 5: INSTALL DRAINAGE SYSTEM. 

STEP 6: INSTALL WATER INLET PIPE.

(2c)

(i)wells

(ii)springs

(iii)rivers 

(iv)lakes

(v)groundwater

(vi)municipal water.

(3ai)

(i)Alternative Food Source 

(ii)Alternative Fuel Source 

(iii)Job creation 

(iv)Reduce Sea Food Trade Deficit 

(v)Creates a Barrier Against Pollution

(3bi)

A grazer is an animal, usually a herbivorous mammal, which eats grass. It is contrasted with browsers, which eat trees & shrubs.

(3bii)

A carnivore is an organism that mostly eats meat, or the flesh of animals. Sometimes carnivores are called predators. 

(3biii)

an animal (such as a clam or baleen whale) that obtains its food by filtering organic matter or minute organisms from a current of water that passes through some part of its system.

(3biv)

herbivore is an animal that feeds mainly or only on plants. In a food chain, herbivores are primary consumers.

(3ci)

Water quality refers to the chemical, physical, and biological characteristics of water based on the standards of its usage. 

(3cii)

(i)temperature

(ii)dissolved oxygen

(iii)pH, conductivity

(iv)ORP

(v)turbidity