2020 free neco fishery answer
2020 free neco fishery answer

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Water quality refers to the chemical, physical, biological, and radiological characteristics of water. It is a measure

of the condition of water relative to the requirements of

one or more biotic species and or to any human need or




(ii)dissolved oxygen

(iii)pH level 


(v)Water turbidity



stocking- is the practice of raising fish in a hatchery and releasing them into a river, lake, or the ocean to supplement existing populations, or to create a population where none exists.

Stocking- density is the quantity of fry or fingerlings per unit of water area.


(i)Fertilization of the pond/addition of manure.

(ii)Maintaining water level.

(iii)Repair of pond and the fence.

(iv)Cropping /selective removal of excess fish.


(i)Pseudomonas fluorescens

(ii)Ichthyophthirius multifiliis 

(iii)fungal infections 




(i)Anorexia (loss of appetite, refusing all food, with consequential wasting)

(ii)Rapid breathing

(iii)Hiding abnormally

(iv)Resting on the bottom


Area= length x breadth 

Area= 30 x 20

Area = 600m²

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