NECO FISHERY OBJ
1-10:DBCADCCCED
11-20:ECCEABBBEA
21-30:CDDBEEBEBD
31-40:EBCCEAAEDD
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NECO FISHERY ESSAY

(1ai)
Area = Length x Breadth
Area = 130 x 70
Area = 9100m²

(1aii)
A fish pond is an artificial lake or retention basin stocked with fish and used in aquaculture for fish farming, recreational fishing, or ornamental purposes.

(1aiii)
(i) Suitable land area
(ii) Availability of water supply
(iii) Quality of water
(iv) Soil characteristics

(1bi)
(i) Selection of ingredients
(ii) Grinding
(iii) Feed formulation
(iv) Mixing
(v) Pelleting

(1bii)
(i) De-weeding:
This is the removal of weeds from the field. It is an effective pre-harvesting method of crop protection and crop production management.

(ii) De-slitting:

This is the removal of fine silt and sediment that has collected in a river to restore its natural capacity, without widening or deepening the river

(2ai)
(i) It serves as sources of food
(ii) It serves as sources of fuel
(iii) It provides job opportunities
(iv) It reduces trade deficit
(v) It reduces wild stock pressure
(vi) It helps in biodiversity conservation

(2aii)
Clarias gariepinus species are cultured in areas with a tropical climate. It is a hardy fish that can be densely stocked in low oxygen waters making it ideal for culture in areas with a limited water supply. Its air-breathing ability, high fecundity, fast growth rate, resistance to disease and high feed conversion efficiency makes clarias gariepinus the culturable.

(2bi)
[TABULATE]

=HETEROTIS NILOTICUS=
(i) They belong to the order of osteoglossiformes
(ii) They feed on invertebrates, copepods and chironomids

=BAGRUS BAYAD=
(i) They belong to the order of siluriformes
(ii) They feed on substances of animal origin

(2bii)
(i) They both belong to the class of actinopterygii
(ii) They are both fresh water habitats

(2c)
(i) They have high growth rate

(ii) They are resistant to common diseases and infection of parasites

(5ai)
aquatic weed is a plant that grows (usually too densely) in an area such that it hinders the usefulness or enjoyment of that area.

(5aii)
{CHOOSE ANY TWO}
(i) Physical removal of weeds: It involves cutting, pulling, or raking weeds by hand. It is time-consuming and labor-intensive and is most suitable for small areas or for locations that cannot be reached by machinery.

(ii) Mechanical removal: It is accomplished by specialized harvesting machinery equipped with toothed blades and cutting bars to cut the vegetation, collect it, and haul it away. It is suitable for off-shore weed removal or to supplement chemical control.

(iii) Biological control: These methods generally involve the introduction of weed-eating fish, insects, competing plant species or weed pathogens into an area of high weed growth. While there are individual success stories (for example, stocking lakes with grass carp).

(5aiii)
CONCRETE POND
(i) Concrete ponds are used for intensive fish farming
(ii) concrete walls/banks eliminate erosion due to currents caused by mechanical aeration

FIBRE TANK
(i)
Coming

(5bi)
(i) All catfish, except members of Electric Catfish family, possess a strong, hollow, bony leading ray on their dorsal and pectoral fins
(ii) Catfish have a sweet, mild flesh which makes them important as food fish throughout the world
(iii) Catfish have no scales

(5bii)
(i) Salting the fish removes water and lowers the water activity
(ii) Salting of fishes prevent foul smell
(iii) Salting of fishes makes the fishes preserve for longer time

(5biii)
(i) DECAPITATION involves direct loss of brain function due to ischemia.

(ii)DEGUITING: A mixture of delight and guilt felt when a colleague, whom you despise, suffers a misfortune.