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WAEC Free Fisheries 2021 Answers

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WAEC
West Africa Examination council

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2021 WAEC Free Fisheries Questions And Answers

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FISHERIES ESSAY 👇

(6a)
(i)Hatcheries can provide food sources to carnivorous fish, enabling their continued supply.
(ii)Hatcheries allow for the replenishment of fish in sea waters.
(iii)The process of running fish hatcheries is very labor-intensive.
(iv) Hatcheries protect aquatic species from disappearing from ecosystems.

(6b)
(i)Raceways offer a much greater ability to observe the fish.
(ii)Raceways can be easily built in series.
(iii)It is Less labour intensive to cleaning and feeding.
(iv)It allows for Easy monitoring of fish.

(6c)

(4a)
Stocking rate of a fish pond is the process of introducing selected, culturable, compatible, and fast-growing fish seed into ponds for growing.

(4b)
(i) Total removal of the polluted water.
(ii) Cleaning of the pond
(iii) Growing of water plants
(iv) Control algae growth.
(v) Repair of leaks.

(4ci)
It shows that there is deficiency of oxygen and pollution of the water body due to algae bloom

(4cii)
(i) Increase in nutrient in the body of the water
(ii) Algae outgrowth
(iii) Oxygen deficiency
(iv) Low light penetration

(4ciii)
(i) It may lead to death
(ii) It may lead to congenital disease of the Clarias spp
(iii) It leads restlessness of the fish due to oxygen deficiency
(iv) It can cause loss of weight

(1a)
(i)plastic bags or 5-gallon buckets with water from the tank to transport your broodstock.
(ii)Make sure the bag/bucket has enough air for your brood stock
(iii)Take any plants from the tank and place them in bags with water from the tank to keep good bacteria on them alive.
(iv)Try to save 80% of the water from your tank

(1b)
(i)to help reduce the level of shock
(ii)To help curtail harsh weather conditions
(iii)To reduce death rate and maximize survival

(1c)
(i)fertilization
(ii)Incubation
(iii)hatching of eggs
(iv)Overprim

(1d)
(i)Eradication of predatory animals
(ii)Eradication of insect
(iii)Eradication of aquatic weeds
(iv)Assessment of food in nursery

(1e)
(i)water level
(ii)Level of rainfall
(iii)Water temperature
(iv)Turbidity
(v)Ph level of the water

(6a)
(i)Hatcheries can provide food sources to carnivorous fish, enabling their continued supply.
(ii)Hatcheries allow for the replenishment of fish in sea waters.
(iii)The process of running fish hatcheries is very labor-intensive.
(iv) Hatcheries protect aquatic species from disappearing from ecosystems.

(6b)
(i)Raceways offer a much greater ability to observe the fish.
(ii)Raceways can be easily built in series.
(iii)It is Less labour intensive to cleaning and feeding.
(iv)It allows Easy monitoring of fish.

(6ci)
Hatching trough: They are used for the hatching of channel catfish eggs and help in eggs adhering to nest material or adhering in a mass to each other.

(6cii)
Happa: they are use for generating fingerlings and also The mesh size is such that the fry or fish inside can not escape.

(6ciii)
Syringe: It is use to deflate the swim bladder from a fish that’s been brought quickly out of deep water and can’t swim back down.

(6civ)
Microscope: It is use to examine scrapes from the fish skin

(6cv)
Aquarium tank: It is use to allow the fish culturist to easily manage stocks and to exert

(6d)
(i)Prawn shell waste
(ii)Groundnut oil cake
(iii)Wheat bran

(6e)
(i)phosphorus
(ii)Nitrogen
(iii)Carbonaceou Biochemical Oxygen Demand
(iv)Die-off and decomposition

 

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Fisheries Questions

FISHERIES OBJ:


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