2021 NECO FISHRIES Questions & Answers: 2020 NECO FISHRIES ANSWERS Night before Exam

FISHERIES OBJ
1-10: BEBABDEECE
11-20: AEABEBAECE
21-30: CEBCCAAABE
31-40: CABBCDADCC
41-50: ABEECACDEB
51-60: CCEBBDCEDD

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(1a)
(i)Bad water odour could occur
(ii)It causes oxygen depletion in water
(iii)There is algae bloom/high water turbility/low transparency
(iv)It imparts off flavour of fish

(1b)
(i)aquaculture;is breeding, raising, and harvesting fish, shellfish, and aquatic plants. Basically, it's farming in water.

(ii) fecundity; is the number of ova that are likely to be laid by a fish during the spawning season'. The number of eggs produced by a fish differs in different species, and depends on the size and age of the fish

(iii) pond; is described as an enclosure of water body specifically for growing fish or other aquatic animals under controlled conditions/environment. It has an inlet and outlet.

(iv) spawn; is The expulsion of gametes from the body into the surrounding water is called 'spawning' resulting in fertilization.

(1ci)
(i)maximum fish production is possible in intensive polyculture.
(ii)more profit from fish farming is possible.
(iii)creates many employment opportunities.
(iv)intensive polyculture of fish is fully controlled by a farmer.

(1cii)
-Advantage-
(i)Less use of pesticide
(ii)Less defforestation

-Disadvantage-
(i)Less production of food
(ii)Cannnot fulfill basic needs of growing population

(3a)
(i) Source of food
(ii) Means of increasing the available protein to people at a reduced cost
(iii) Provides employment and income
(iv) Provides means of recycling wastes
(v) Generates foreign exchange

(3b)
(i)They do not make crust on the soil
(ii)They improve water movement
(iii)Improve the soil structure
(iv)Enables the growth of phytoplanktons in the pond

(3ci)
Fishing gears are tools or equipments used to capture marine/aquatic resources. 

(3cii)
(i) Iron bar
(ii) Lead
(iii) Burnt clay
(iv) Stone
(v) Bone

(3ciii)
(i) Minimise chemicals and veterinary drugs
(ii) Provision of good water quality
(iii) Avode overfeeding the fish
(iv) Avoid Overcrowding the tank or pond

(5ai)
(i)Polystyrene
(ii)expanded polystyrene
(iii)Polyethylene PE
(iv)Polypropylene PP

(5aii)
(i)they have a high iron content. 
(ii)they are Rich in nutrients like omega-3 fatty acids.
(iii)they are very low-fat cooking process
(iv)they have oils, fats and sauces for cooking.

(5b)
(i)The body of the fish must be rigid or arched. 
(ii)The fish should be bright, with a metallic luster. 

(5ci)
(i)Fishing gears
(ii)fishing poison
(iii)Dynamite

(5cii)
(i)they feed by extracting algae and other food particles from the water they are almost constantly drawing over their gills.
(ii)They are generally whitish-gray in outer shell color, and their inside shell is usually a porcelain white.
(iii)They have extremely strong adductor muscles to close their shells when threatened.

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